, Nitrogen Oxides (N2) - Answer: ___________: These are highly reactive gases formed when the heat of
combustion initiates reactions between atmospheric nitrogen (N2) and oxygen (O2).
Sulfur Dioxide (So2) - Answer: ___________: This is a colorless, corrosive gas that damages both plants
and animals.
Ambient Air - Answer: This is the air around us.
Non-point Source - Answer: Fugitive, or __________, emissions are those that do not go through a
smokestack.
Criteria Pollutants - Answer: Amendments to the law in 1970 designated new standards, to be applied
equally across the country, for six major pollutants: sulfur dioxide, nitrogen oxides, carbon monoxide,
ozone (and its precursor volatile organic compounds), lead, and particulate matter. These six are
referred to as _____________.
Carbon Monoxide (CO) - Answer: ___________: This is less common but more dangerous than the
principal form of atmospheric carbon, carbon dioxide (CO2).
Photochemical Oxidants - Answer: ___________: These are compounds created by reactions driven by
solar energy and atmospheric acids are probably the most important secondary pollutants.
Aerosols - Answer: ___________: These are extremely minute particles or liquid droplets suspended in
the air, are included in this class.
Particulate Material - Answer: ___________: This includes dust, ash, soot, lint, smoke, pollen, spores,
algal cells, and many other suspended materials.
Primary Pollutants - Answer: ___________: These are substances that are harmful when released.
Ozone (O3) - Answer: ___________: This is important in the upper atmosphere, where it shields us
against ultraviolet radiation from the sun.
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