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| 8088222960 | atmosphere | thin layer of gases surrounding our planet | 0 | |
| 8088222961 | troposphere | atmospheric layer closest to surface, weather occurs here | 1 | |
| 8088222962 | stratosphere | contains ozone layer, blocks out UV light | 2 | |
| 8088222965 | nitrogen | major component of atmospheric gases = 78% of troposphere. | 3 | |
| 8088222966 | ozone layer | Found in stratosphere, filters out Ultra violet radiation UVA and UVB | 4 | |
| 8088222969 | Thermal inversion | warm layer of air over cold layer, pollutants can be trapped | 5 | |
| 8088222970 | Primary pollutants | harmful substances released into the air through volcanoes, industry, combustion, etc. | 6 | |
| 8088222971 | Secondary pollutants | interaction of a primary pollutant with another substance in the air forming new chemical compounds | 7 | |
| 8088222972 | Clean Air Act | Federal Law monitoring industrial and auto emissions pertaining to air quality standards | 8 | |
| 8088222973 | Carbon monoxide CO | colorless odorless gas produced by incomplete burning of fuel- asphyxiant for humans. produced by incomplete combustion (burning with limited oxygen) Odorless, colourless and tasteless. | 9 | |
| 8088222974 | Carbon dioxide- CO2 | greenhouse gas that contributes to maintaining the Earth's temperature. Not monitored by the EPA as part of the Clean Air Act. | 10 | |
| 8088222975 | Sulfur dioxide- SO2 | colorless gas with strong odor from coal burning | 11 | |
| 8088222976 | Nitrogen dioxide NO2 | Brown gas produced by burning of fossil fuels, especially vehicle emissions, contributes to photochemical smog. Oxidizing. | 12 | |
| 8088222977 | Tropospheric ozone | ground level ozone caused by pollution and photochemical smog. | 13 | |
| 8088222978 | Particulate matter | suspended solids or liquids in the air- can be harmful to respiratory system, especially if made of hazardous materials such as heavy metals or asbestos. | 14 | |
| 8088222979 | Lead -Pb | heavy metal, no longer in gasoline, now from industrial metal smelting and coal burning, affects CNS | 15 | |
| 8088222980 | Volatile organic compounds -VOC | carbon containing chemicals and solvents that are reactive and combustable. Primary pollutant in photochemical smog. | 16 | |
| 8088222981 | Scrubbers | remove airborne pollutants from smokestacks- (ie. coal burning power plants) | 17 | |
| 8088222982 | Industrial smog | caused from burning of coal-- releasing SOx into atmosphere. Gray air smog. | 18 | |
| 8088222983 | Photochemical smog | froms when sunlight mixes with nitrogen oxides (NOx), and VOCs forming (O3) ozones, PANs and Aldehydes. | 19 | |
| 8088222984 | Chloroflourocarbons-CFCa | depletes ozone, from refrigerants, air conditioner, propellants in aerosols, cleaners and fumigants. | 20 | |
| 8088222985 | Acid deposition | from sulfur dioxide and nitrogen dioxides mixed with water vapor to become acids (Sulfuric and Nitric acid)-- return to land in precipitation. | 21 | |
| 8088222986 | Peroxyacyl Nitrates (PANs) | Secondary pollutant in photochemical smog. Oxidizing agent. | 22 | |
| 8088251450 | Natural emissions | Pollutants come from volcanoes, forest fires, and the biosphere. | 23 | |
| 8088260779 | Anthropogenic emissions | Pollutants come from human activities, such as vehicles, power plants, and industrial processes. | 24 |
