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| 9525965347 | Atmosphere | Air surrounding Earth made up of gases, including 78% nitrogen, 21% oxygen, and 0.03% carbon dioxide. | 0 | |
| 9525965348 | Function of the Atmosphere | Absorbs hazardous solar radiation, burns up incoming meteors, transports and recycles water and nutrients, and moderates climate. | 1 | |
| 9525965349 | Troposphere | Bottommost layer; (11 km, 7 mi) air denser near surface | 2 | |
| 9525965350 | Stratosphere | 2nd layer: 11-50 km (7-31mi) above surface: colder at lower boundary than upper boundary: Ozone absorb and scatter UV radiation | 3 | |
| 9525965351 | Ozone layer | Layer that reduces the amount of UV radiation that reaches Earth's surface. (Earth's sunscreen!) | 4 | |
| 9525965357 | Mesosphere | 3rd layer of atmosphere from surface | 5 | |
| 9525965358 | Thermosphere | Upper layer of atmosphere (~300 mi) | 6 | |
| 9525965371 | Air pollutants | Gases and particulate material added to the atmosphere that can affect climate or harm people or other organisms | 7 | |
| 9525965372 | Air pollution | Concentration of trace substances such as carbon monoxide, sulfur oxide, hydrocarbons, and solid particulates, at a greater level than occurs in average air. | 8 | |
| 9525965373 | Outdoor air pollution | Ambient air pollution, , pollution made of 6 principal air components: ozone, carbon monoxide, lead, nitrogen dioxide, sulfur dioxide, particulate matte | 9 | |
| 9525965374 | Aerosols | Can cause a haze in the atmosphere that reflects sunlight or increases cloud cover | 10 | |
| 9525965375 | Primary pollutants | Pollutants that are put directly into the air by human or natural activity. Ie: soot and carbon monoxide, | 11 | |
| 9525965376 | Secondary pollutants | Air pollutants produced through reactions between primary pollutants and normal atmospheric compounds. ie: tropospheric ozone, sulfuric acid, | 12 | |
| 9525965377 | Clean Air Act 1970 | Required EPA to develop and enforce regulations to protect the public from airborne contaminants; forced states to follow and make sure the laws for followed in relation to the EPA. States allowed to decide officials for enforcement. | 13 | |
| 9525965378 | Clean Air Act 1990 | Strengthened regulations for auto emissions, toxins, acid deposition, ozone depletion, while introducing market incentives, emissions trading | 14 | |
| 9525965379 | Carbon monoxide | CO , Colorless, odorless, poisonous gas produced by the combustion of of carbon or organic fuels. | 15 | |
| 9525965380 | Sulfur dioxide | SO₂ , Created naturally by volcanoes. Human source is mainly from the burning of coal. Creates respiratory problems in humans and acid rain in the environment. colorless gas but pungent odor. | 16 | |
| 9525965381 | Nitrogen dioxide | NO₂ , a foul-smelling reddish brown gas, produced primarily by the incomplete combustion of fuel, that contributes to smog and acidic deposition | 17 | |
| 9525965382 | Nitrogen oxides | (NOx) Major source is auto exhaust. Primary and secondary effects include acidification of lakes, respiratory irritation, leads to smog and ozone. Reduced using catalytic converters. | 18 | |
| 9525965383 | Tropospheric ozone | Ground level ozone; is considered bad because it is closer to the earth making it more likely for someone to breathe it in. It is also more dangerous because it is made up of particulate matter. | 19 | |
| 9525965384 | Particulate matter | A small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant) | 20 | |
| 9525965385 | Lead | Pb , A highly toxic metal that can damage the nervous system, blood, and kidneys, and can cause harm to the development of a children's intellectual abilities. Main source was leaded gasoline. | 21 | |
| 9525965386 | Volatile organic compounds (VOCs) | The fumes given off by organic chemicals such as paints, aerosol sprays, cleaner, disinfectants, new carpets, and glues. | 22 | |
| 9525965387 | Three technologies that decrease air pollutants | Baghouse filters, electrostatic precipitators, and scrubbers | 23 | |
| 9525965388 | Scrubbers | Devices containing alkaline substances that precipitate out much of the sulfur dioxide from industrial plants. |  | 24 |
| 9525965389 | Toxic air pollutants | Substances known to cause cancer, reproductive defects, or neurological, developmental, immune system, or respiratory problems. | 25 | |
| 9525965390 | Examples of toxic air pollutants | Hydrogen sulfide gas in swamps, smelting, sewage treatment and industrial processes. mercury, VOCs like benzene and methylene chloride, | 26 | |
| 9525965391 | Industrial smog | Consists mostly of sulfur dioxide, suspended droplets of sulfuric acid (formed from some of the sulfur dioxide) and a variety of suspended solid particles and droplets. | 27 | |
| 9525965392 | Photochemical smog | Brown-air smog: , A brownish haze that is a mixture of ozone and other chemicals, formed when pollutants react with each other in the presence of sunlight | 28 | |
| 9525965393 | Chlorofluorocarbons (CFCs) | Widely regarded as harmful bc they are chemically unreactive to normal conditions. but over Antarctica they condense into tiny ice crystals that break down and produce chlorine which attacks and destroys the ozone | 29 | |
| 9525965394 | Montreal Protocol | (1987) Phase-out of ozone depleting substances | 30 | |
| 9525965395 | Acid deposition | Caused by sulfuric and nitric acids resulting in lowered pH of surface waters (acid rain) | 31 | |
| 9525965396 | Atmospheric deposition | Contaminants carried by air currents and precipitated into watersheds or directly onto surface waters, The wet or dry deposition on land of a wide variety of pollutants, including mercury, nitrates, organochlorines, and others. | 32 | |
| 9525965397 | Indoor air pollution | Compounds that affect breathing that occur indoors. Examples: wood stove smoke, furnace emissions, formaldehyde, radon, household chemicals & Tobacco smoke. | 33 | |
| 9525965398 | Cigarette smoke | Leading cause of leading indoor pollutant. Can cause asthma, irritation of eyes, nose, and throat, and lung irritations and cancer. | 34 | |
| 9525965399 | Radon | 2nd leading cause of indoor air pollution., A colorless, odorless, radioactive gas. can cause lung cancer. | 35 |
