Which of the following gases is not a green house gas? • Term ‘smog’ is derived from the words ‘smoke’ and ‘fog’. nitrogen dioxide. Photochemical smog is composed of primary and secondary pollutants. They include benzene, methane, formaldehyde and others. Ozone is an ingredient in photochemical smog and is a colorless and highly reactive gas. Photochemical smog is produced when sunlight reacts with nitrogen oxide s and at least one volatile organic compound (VOC) in the atmosphere. Photochemical smog is driven by the u.v. In addition, it is noted that for this type of material, not only the emission of the gas must be taken into consideration, but also the time that the volatile particles spend in the atmosphere, affecting climate change and photochemical ozone (smog). Photochemical Smog The chemically simple pollutants released by motor vehicles into the atmosphere do not completely remain in that state of simplicity: They undergo chemical change. Photochemical smog is formed by the combination of smoke, dust and fog with an air pollutant in the atmosphere as a result of a photochemical smog. 30 seconds. It is a mixture of smoke, fog and sulphur dioxide. The primary causes are deforestation and the burning of fossil fuels such as coal. •(we will get to this next) Components of Photochemical Smog Photochemical smog requires neither smoke nor fog. Photochemical smog concept Smog is a fog made of pollutants rather than droplets of water. Characteristics It is chemically oxidizing because it has oxidants in higher concentrations. PM 2.5 (also known as fine fraction particles) is generally defined as those particles with an aerodynamic diameter of 2.5 microns or less. Environ . Photochemical smog is a highly reactive gas that harms most living organisms. Photochemical - Smog Formation. " Consider the oxides XO2, where X is a main group element. Photochemical air pollution. What Causes Photochemical Smog and … Human activities has decreased Ozone (O3) in the stratosphere and increased the amount near the ground. CFCs were made in the past for refrigerants, spray pack propellants, producing foam plastics and as solvents for electronic components. In … •Photochemical smog first caused problems in Los Angeles it is often called Los Angeles type smog. There are two kinds of smog: a) Classical smog. b) Photochemical smog. On July 18, 1970 (Showa 45), an abnormal situation occurred in which female students fell down one after another and were carried by ambulance while practicing softball at a high school in Suginami-ku, Tokyo. Source: are released from burning fuel (fossil fuels or biomass), solvents, paints glues and other commonly used products. Photochemical smog is a type of air pollution produced when sunlight acts upon motor vehicle exhaust gases to form harmful substances such as ozone (O 3), aldehydes and peroxyacetylnitrate (PAN). This smog has a high reducing agent concentration, so it is also known as reducing smog. 2: Bakersfield, CA. (i) NO 2 (ii) O 3 (iii) SO 2 (iv) Unsaturated hydrocarbon 3. Air pollution is a recognised problem in Australia's najor urban areas. In addition, secondary organic aerosol, which is formed from the low-vapor pressure products of gas-phase chemical reactions, is found to be a major source of fine particle organic compound mass under the severe photochemical smog conditions studied here. Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. The industrial revolution has been the central cause for the increase in pollutants in the atmosphere over the last three centuries. For example, nitrogen dioxide (NO2) reacts with atmospheric oxygen (02) in the presence of light to produce ozone (O,) and nitrogen monoxide (NO). Primary pollutants are often introduced into the atmosphere through automobile emissions and industrial processes. Mogharabi said the air district also is investigating whether a COVID-related shift in the balance between the two main smog-forming pollutants — combustion gases … Tech . It contains anthropogenic air pollutants, mainly ozone, nitric acid, and organic compounds, which are trapped near the ground by temperature inversion. D. O 3, PAN and NO 2. Atmospheric chemistry is a branch of atmospheric science in which the chemistry of the Earth's atmosphere and that of other planets is studied. Ozone in the troposphere is a greenhouse gas and contributes … Photochemical smog, often referred to as "summer smog", is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles and ground-level ozone. Classic smog results from large amounts of coal burning in an area caused by a mixture of smoke and sulfur dioxide. In the late 1940s and early 1950s, farmers began to note serious damage to some crops, especially to romaine lettuce and parsley in the San Gabriel Valley. Characteristics It is chemically oxidizing because it has oxidants in higher concentrations. Smog is a kind of air pollution. At least two distinct types of smog are recognized: sulfurous smog and photochemical smog. The primary pollutants in photochemical smog are nitrogen oxides - like car exhaust, coal power plants, or factory emissions - and VOCs - compounds released from burning fuels or consumer products like cigarettes, paints, and cleaning solvents that easily become vapors or gases. A photochemical smog is formed as a result of concentration of aerosol particles and a mixture of gases … •Photochemical smog first caused problems in Los Angeles it is often called Los Angeles type smog. Formation of Photochemical Smog. Photochemical smog constitutes a serious health problem in most large cities. Photochemical smog is a brownish-gray haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen. It contains anthropogenic air pollutants, mainly ozone, nitric acid, and organic compounds, which … A. Ozone, PAN and CO. B. HC, NO and PAN. They form naturally in the environment and cause problems like photochemical smog. The industrial revolution has been the central cause for the increase in pollutants in the atmosphere over the last three centuries. 60 seconds . The gas-phase photochemical Families of trace gases are surveyed. The dual role of ozone leads to two separate environmental issues. XO2 is a toxic, brown gas and a component of photochemical smog.c. It is an essential ingredient in photosynthesis, the process by which plants make food and energy. Modelling of simulated photochemical smog with kinetic mechanisms. •Other cities that frequently suffer are Santiago, Mexico City, Rio de Janeiro, and Beijing. The “photochemical smog” is a typical form of pollution of all the main urban and industrial areas of the world.It occurs in or near areas with a high traffic density, in the presence of specific climatic conditions (no wind or weak winds, high temperatures, etc. Industrial smog typically exists in urban areas where factories burn fossil fuels such as coal, which creates smoke and sulfur dioxide that mix with fog droplets to create a thick blanket of haze close to the ground. It's components are Smoke, fog, and sulphurdioxide. Air pollution in large industrial cities (or urban regions) is called smog. Effects of Photochemical Smog. Cars and trucks that combust fuel also emit smog forming emissions, such as nitrogen oxide, non-methane organic gases, carbon monoxide, particulate matter, and formaldehyde. Photochemical smog is a brownish-gray haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen. sulfuric acid. Photochemical smog is also known as “Los Angeles smog”. The nitric oxide that initiates the formation of photochemical smog is emitted from automobiles and industrial plants. Smog was frequent in industrial areas and remains a familiar sight in cities today. Photochemical pollution. Q. Health effects: In addition to smog (ozone) effects, some are carcinogenic. Primary pollutants, which include nitrogen oxides and volatile organic compounds, are introduced into the atmosphere via vehicular emissions and industrial processes. Photochemical smog differs from ordinary smog in that it is not a simple accumulation of pollutants, but the result of chemical reactions between them. Sources of PM. The word 'smog' is derived from the two words-smoke and fog. The confusion arises because there are actually two kinds of smog: London smog (well know for its fog) and L.A. smog (also know as photochemical smog). Then, smog was common only in industrial areas. energy from the sun, and Los Angeles is better know for its sunny weather. During the formation of ozone, nitrogen dioxide from vehicle exhaust is photolyzed by incoming solar radiation to produce nitrogen oxide and an unpaired oxygen atom. What it is? This is because the components of photochemical smog are oxidizing in … Primary pollutants, which include nitrogen oxides and volatile organic compounds, are introduced into the atmosphere via vehicular emissions and industrial processes. D. ozone and PAN ChemistryChemical Kinetics and Process Dynamics in Aquatic SystemsModeling of Simulated Photochemical Smog with Kinetic ... address ideal gas laws, real gases, the thermodynamics of simple systems, thermochemistry, entropy and the second law, the Gibbs free energy, (iii) Ozone is also a greenhouse gas. Activity 3.37 What explains the lowered air quality association with urban areas? This type of smog has its origin in the nitrogen oxides and hydrocarbon vapours emitted by automobiles…. VOC. The pollutants with the strongest evidence of health effects are particulate matter (PM), ozone (O 3), nitrogen dioxide (NO 2) and sulphur dioxide (SO 2).. The collection of chemicals found in photochemical smog causes problems for plants and animal life. Unlike other cities in California’s smog-trapping San Joaquin Valley, Bakersfield can blame some of its air pollution on oil and gas production. Photochemical smog occurs in warm, dry and sunny climate. Identify X in each of the following cases: a. XO2 is a natural component of the atmosphere, implicated in global warming.b. The main photochemical action in the urban atmosphere involves the hydrocarbon and nitrogen oxide families. Photochemical smog (brown smog) is formed by the reaction of nitrogen oxides and VOCs with tropospheric ozone. Photochemical smog, as commonly seen in the Los Angeles Basin, is mainly composed of ozone and nitrogen dioxide. Photochemical smog concept Smog is a fog made of pollutants rather than droplets of water. Ozone in the troposphere is a greenhouse gas and contributes … Conversion was performed using the ratio of characterization factors in TRACI: C 2 H 4 = 8.99 O 3-e. The distribution of trace gases in the atmosphere is reviewed. The smog turns brownish in color … Chlorofluorocarbons are of concern in the atmosphere because they destroy stratospheric ozone. Smog is air pollution that reduces visibility.The term "smog" was first used in the early 1900s to describe a mix of smoke and fog.The smoke usually came from burning coal.Smog was common in industrial areas, and remains a familiar sight in cities today. (ii) In the troposphere (the bottom 10 kilometers or so of the atmosphere) ozone is a pollutant and is one of the main ingredients in photochemical smog (Los Angeles-type smog). Smog is formed when pollutants are released into the atmosphere from sources such as the burning of fossil fuels in cars, power plants and local industries. 10 / 19. The word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog, its opacity, and odour. A. nitrogen dioxide and unburned hydrocarbons. Letters, 2004) Evolution of nanoparticle size and mixing state near the point of emission (Atmospheric Environment, 2004) The short-term cooling but long-term global warming due to biomass burning (J. Ozone is an ingredient in photochemical smog and is a colorless and highly reactive gas. The differences between the two types of smog are summarized in the table below. Over the past decade, China has suffered severe photochemical smog and haze pollution, especially in North China, the Yangtze River Delta, and the … Photochemical Smog: History & Summary. C. unburned hydrocarbons and carbon monoxide. Adverse health consequences to air pollution can occur as a result of short- or long-term exposure. Smog is air pollution consisting of smoke and fog. In high concentrations, NOx is harmful to human health, animals and plants, contributes to the formation of smog, acid rain and is relevant in the chemistry of tropospheric ozone and that of gases with a strong greenhouse effect such as N 2 O (Crutzen, 1979). The ensuing photochemical reactions resulted in growth of the particles originally present. It requires neither smoke nor fog. Photochemical smog differs from ordinary smog in that it is not a simple accumulation of pollutants, but the result of chemical reactions between them. Secondary pollutants, like ozone, result from the reaction of primary pollutants with ultraviolet light. Composition of the Atmosphere 78% nitrogen, 21% oxygen, 1% Argon, 0.04 CO2 Effects of tropospheric ozone A form of smog that characterizes polluted atmospheres where high concentrations of nitrogen oxides and volatile organic compounds--often from gas-driven automobilesmixed with sunlight promote a series of photochemical reactions that lead to the formation of ozone and a range of oxidized and nitrated organic compounds. The two smogs can be differentiated as follows: Classical smog : It occurs in a cool, humid climate. Photochemical smog is a type of air pollution in the troposphere of our planet produced when sunlight acts upon motor vehicle exhaust gases to form harmful substances such as ozone (O3). The energy in the sunlight converts the pollutants into other toxic chemicals. Today, most of the smog we see is photochemical smog. Japan’s first photochemical smog occurs in Tokyo Photochemical smog generation mechanism. Indoor chambers using either fluorescent blacklight or xenon arc light sources and an outdoor chamber utilizing sunlight were employed. Climate, 2004) The primary pollutants in photochemical smog are nitrogen oxides - like car exhaust, coal power plants, or factory emissions - and VOCs - compounds released from burning fuels or consumer products like cigarettes, paints, and cleaning solvents that easily become vapors or gases. Photochemical smog, which occurs most prominently in … 1. classical smog – This is the typical form of smog found in areas which have a humid climate. Tags: Question 11 . Smog is common in big cities with a lot of industry and traffic. B. carbon monoxide and nitrogen monoxide. Photochemical smog, which is also known as “Los Angeles smog,” occurs most prominently in urban areas that have large numbers of automobiles. The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon. For photochemical oxidation potential (smog formation), the reference substance from EIOLCA is ozone equivalents while the reference substance for the IMPACT2002+ method (used for damage assessment, below) is ethene (C 2 H 4). The term “smog” was first used in the early 1900s to describe a mix of smoke and fog. Photochemical smog is when air pollutants react to UV rays. It is especially harmful for senior citizens, children, and people with heart and lung conditions such as emphysema, bronchitis, and asthma.It can inflame breathing passages, decrease the lungs' working capacity, cause shortness of breath, pain when inhaling deeply, wheezing, and coughing. Photochemical smog, a tropospheric phenomenon, is examined. Photochemical smog refers to smog produced when sunlight interact with molecules of harmful chemicals and pollutant in the earth atmosphere. Sulfurous smog, which is also called “London smog,” results from a high concentration of sulfur oxides in the air and is caused by the use of sulfur-bearing fossil fuels, particularly coal. Rural areas have more green spaces that filter the air through plants. Photochemical smog depends on primary pollutants as well as the formation of secondary pollutants. Photochemical smog occurs most prominently in urban areas that have large numbers of automobiles (Nitrogen oxides are the primary emissions). the photochemical reaction of nitrogen dioxide (NO2) to form ozone. C. O 2, PAN, and NO 2. The lone oxygen then bonds to atmospheric oxygen (O2) with the assistance of sunlight. Photochemical smog, lowered air quality, and increased greenhouse gas release is much more common in urban areas compared to rural areas. Dimitriades , B . QUESTION 33) Catalytic converters reduce some, but not all, of the component gases of photochemical smog. This primary pollutant creates a reddish brown gas creating photochemical smog and tropospheric ozone. It forms a yellowish brown haze especially during winter and hampers visibility. It mainly consists of nitrogen dioxide (NO 2), ozone (O 3), peroxyacetyl nitrate (PAN), and organic compounds containing the aldehyde group. In general, there are two types of smog: industrial and photochemical. Note that industrial smog—sometimes called sulfurous or black smog—is distinct from photochemical smog, which typically develops in warmer conditions in the summer. In latter stages of smog formation visibility in the atmosphere is lowered by the presence of a haze of fine particles formed by the oxidation of organic compounds in smog. Ozone is a component of photochemical smog, which, in turn, is the result of emissions of hydrocarbons and nitrogen oxides from motor vehicles and industry. Effects of Photochemical Smog. A smoggy atmosphere contains ozone, O 3, organic oxidants, nitrogen oxides, aldehydes, and other noxious species. One of the following is not amongst the components of photochemical smog, identify it. A. Photochemical smog is a condition that develops when primary pollutants (oxides of nitrogen and volatile organic compounds created from fossil fuel combustion) interact under the influence of sunlight to produce a mixture of hundreds of different and hazardous chemicals known as secondary pollutants. XO2 is a colorless, toxic gas, implicated in acid rain. Which two photochemical smog gases are NOT part of the catalytic converter reactions? 2. It is formed by the action of solar radiation with airborne pollutants like nitrogen oxides and volatile organic compounds. Now that more people are using cars, smog is becoming an increasing problem all over the world. Photochemical smog also has devastating effects on the environment. Automobiles and factories emit smoke containing hydrocarbons and nitrogen dioxide, which becomes the main component of photochemical smog under the action of sunlight. Historically, the term smog referred to a mixture of smoke and fog, hence the name smog. Experiments were conducted to determine particle growth rates as a function of particle size in the presence of reacting organic gases. B. Near-surface ozone is a key component of photochemical "smog," a familiar problem in the atmosphere of many cities around the world. Historically, the term smog referred to a mixture of smoke and fog, hence the name smog. This a more significant problem in urban areas, such as Los Angeles, although winds and weather drive some of the smog into rural areas. VOCs are released from gasoline, paints, and many cleaning solvents. The Los Angeles air basin in southern California was known during the early 1940s for its photochemical smog produced by absorption of light by gases in the air[1,2,4]. What does photochemical smog do? Photochemical smog is a mixture of air pollutants which have been chemically altered into further noxious compounds by exposure to sunlight. The effect on photochemical smog of converting the U.S. fleet of gasoline vehicles to modern diesel vehicles (Geophys. The major source of photochemical smog is the gases emitted by factories. This is a mixture of gases and since it is formed by photochemical reactions, it is called the photochemical smog. Why is photochemical smog bad: These health risks are why many cities monitor smog levels. Photochemical smog, also known as summer smog, is a type of smog that is produced when UV light originating from the sun interacts with the oxides of nitrogen present in the atmosphere. Secondary pollutants, like ozone, result from the reaction of primary pollutants with ultraviolet light. Ozone or photochemical smog is created when two primary pollutants, hydrocarbons (toxic compounds found in fossil fuels) and nitrogen oxides (gases produced by high temperatures and emitted from vehicles), react with sunlight. Sci . Photochemical Smog: History & Summary. ( 1972 ) . 2 Photochemical Smog Although composed of 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.03% carbon diox-ide, and less than 4% water vapor, the Earth’s atmosphere also contains minute amounts of nearly forty other gases such as ozone, helium, hydrogen, nitrogen oxides, and sul-fur dioxides, [46]. 1) Sulfurous smog (or ‘London-type’ smog); 2) Photochemical smog (‘Los Angeles-type’ smog). A smog forming group of molecules. It is reducing in nature . Definition false - (automobiles and trucks are the major sources of photchemical smog) formation in model photochemical smog systems. Thus, we have two types of smog, the first one is the classic smog, and the second one is photochemical smog. These emissions are usually trapped close to the ground, and can form a brownish haze that pollutes our air, particularly over cities in the summertime. In this paper we present a review of atmospheric chemistry research in China over the period 2006-2010, focusing on tropospheric ozone, aerosol chemistry, and the interactions between trace gases and aerosols in the polluted areas of China. Sulfurous smog results from a high concentration of sulfur oxides in the air and is caused by the use of sulfur-bearing fossil fuels, particularly coal. In the overwhelming majority of cases, they are car exhaust gases and smoke from operating enterprises. While increasing attention is being paid to controlling emissions from motor vehicles, there is a growing awareness of the need to measure and control photochemical smog precursors origin- ating from all sources. (i) CO (ii) O 3 (iii) CH 4 (iv) H 2 O vapour 2. Photochemical Smog; In dry and sunny areas of the world, this form of smog is prevalent. Volume 2 Volume 2 CHEMK : A computer modeling scheme for chemical kinetics ( PB80-181084 ) 21 Particulate matter formed from gaseous primary pollutants and compounds in photochemical smog .Smog is a kind of air pollution; the word "smog" is a portmanteau of smoke and fog. Photochemical smog is a serious problem for urban areas that are in a geographical location that contributes to its formation. Photochemical smog formation requires the following conditions: a still, sunny day ), that cause the concentration of polluting gases to increase and prevent them from dispersing. 1. Which of the following group of gases cause photochemical smog? Haze , another term frequently used to describe polluted air, is a general term that refers to the suspended aerosol particles that reduce visibility by scattering light. View solution. Levels of atmospheric carbon dioxide have increased since the Industrial Revolution. Nature: Photochemical oxidants are formed through the concentration of a variety of highly reactive gases in the atmosphere and are often implicated in problems of smog, crop damage and the degradation of works of art. The word ‘smog’ is derived from the two words-smoke and fog. Report an issue. Hydrocarbons and oxides of nitrogen were added to unfiltered ambient air in an 80 m 3 Teflon bag exposed to natural solar radiation. There is concern about increases in ozone in the troposphere. No. particulate matter. While most people can identify smog as a haze or mixture of gases, others know it as simply some sort of air pollution. It is the blend of smoke and fog. A. The smoke usually came from burning coal. Photochemical smog is composed of primary and secondary pollutants. Today, the type of smog that is most often seen is photochemical. Photochemical smog is essentially a mixture of nitrogen oxides and other chemicals formed under the influence of sunlight. •These areas have special geography that makes smog worse. •(we will get to this next) In a photochemical smog, which gas is an eye and mucous membrane irritant? Human activities has decreased Ozone (O3) in the stratosphere and increased the amount near the ground. Photochemical smog occurs when sunlight reacts with the nitrogen oxides that are released from car exhausts. In the overwhelming majority of cases, they are car exhaust gases and smoke from operating enterprises. Similar experiments utilizing acetaldehyde were carried out for comparison and control purposes. This type of smog usually manifests as a brown haze and is most commonly seen in highly populated cities that are placed in relatively warm climates. This is an urgent problem of modern large cities, in which a significant number of various vehicles are concentrated. Cars and trucks that combust fuel also emit smog forming emissions, such as nitrogen oxide, non-methane organic gases, carbon monoxide, particulate matter, and formaldehyde. Carbon dioxide occurs naturally in the atmosphere. Photochemical smog is produced when pollutants from the combustion of fossil fuels react with sunlight. Some plants such as tobacco, tomato and spinach are highly responsive to ozone, so photochemical smog can decimate these sensitive crops, trees and other vegetation. At least two distinct types of smog are recognized: 1) Sulfurous smog (or ‘London-type’ smog); 2) Photochemical smog (‘Los Angeles-type’ … In the upper atmosphere ozone protects us from the sun's ultra violet rays. Q. In addition to this, the effects of photochemical smog are much harmful than the other smog. FORMATION OF PHOTOCHEMICAL SMOG When pollutants like hydrocarbons and nitrogen oxides combine in the presence of sunlight, smog is formed. Photochemical smog – This type of smog is prevalent in dry and sunny areas of the world. This smog acts as a reducing agent in atmospheric pollution and hence it is also known as reducing smog. In atmospheric chemistry, NO x is a generic term for the nitrogen oxides that are most relevant for air pollution, namely nitric oxide (NO) and nitrogen dioxide (NO 2 ). In addition, secondary organic aerosol, which is formed from the low-vapor pressure products of gas-phase chemical reactions, is found to be a major source of fine particle organic compound mass under the severe photochemical smog conditions studied here. These emissions are usually trapped close to the ground, and can form a brownish haze that pollutes our air, particularly over cities in the summertime. Sunlight breaks a bond and releases one oxygen forming nitrogen oxide (NO). S O 2 ... Smog is a kind of air pollution, originally named for the mixture of smoke and fog in the air. •Other cities that frequently suffer are Santiago, Mexico City, Rio de Janeiro, and Beijing. The main components of photochemical smog are nitrogen oxides, Volatile Organic Compounds (VOCs), tropospheric ozone, and PAN (peroxyacytyl nitrate). Photochemical smog (fog) is a fairly new type of air pollution. Cars, trucks and other forms of transportation are the single largest contributor to air pollution in the united states, but car owners can reduce their vehicle's effects on the environment. In addition to this, the effects of photochemical smog are much harmful than the other smog. The photochemical smog can act as a pollution indicator. Nitrogen dioxide is from both natural and anthropogenic sources. •These areas have special geography that makes smog worse. It is a multidisciplinary approach of research and draws on environmental chemistry, physics, meteorology, computer modeling, oceanography, geology and volcanology and other disciplines. In this paper we present a review of atmospheric chemistry research in China over the period 2006–2010, focusing on tropospheric ozone, aerosol chemistry, and the interactions between trace gases and aerosols in the polluted areas of China. Res. Photochemical Smog is a type of air pollutant . These chemical reactions takes place in the atmosphere which leaves airborne particles and ground level ozone. SURVEY . This is because the components of photochemical smog are oxidizing in … For the fourth day in a row, large sections of northeast China remain covered by a thick layer of smog considered hazardous to human health. Thus, we have two types of smog, the first one is the classic smog, and the second one is photochemical smog. Smog is air pollution that reduces visibility. Photochemical smog. Photochemical smog is formed by the combination of smoke, dust and fog with an air pollutant in the atmosphere as a result of a photochemical smog. This is a mixture of gases and since it is formed by photochemical reactions, it is called the photochemical smog. photochemical smog; however, little data was present concern- ing the role of other photochemical oxidant gases or dry depo- sition of particulates from smog as they effect trees. Make a pie chart of percentages of greenhouse gases in the atmosphere. answer choices . Photochemical smog is the chemical reaction of sunlight, Nitrogen oxides (NO྾), Hydrocarbons and volatile organic compound.
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