Air Pollution

1. a source of air pollution before modern times
3. the ability to dissolve in water vapor to form sulfuric acid and interact with the particulate matter and gases in the air to form other products(primary Pollution)
8. comes from burning fuels in vehicles, power plants, and industrial boilers (a primary and secondary pollutant)
10. colorless, odorless gas, 56% of US emissions comes from motor vehicles (a primary pollutant)
12. one way to keep the air pollution from reaching dangerous levels
15. regulates air emissions from stationary and mobile sources
17. machines used in cement factories and coal-burning power plants to remove dust particles from smokestacks
19. pollutant that is put directly into the atmosphere by human or natural activity
20. an example of a secondary pollutant created near the earth's surface

2. a device that cleans exhaust gases of polltants before they can exit the vehicles tail pipe
4. example of a primary pollutant
5. Air pollution Formed when fossil fuels, which contain sulfur, are burned
6. fine and course particles that enter the air as primary pollutants from construction, agriculture, forestry, fires, vehicle use, and industrial processes
7. has no emission from tailpipes or gasoline (an example is the electric car)
9. fraction of air pollution that comes from gas burned by vehicles
11. the contamination of the atmosphere by wastes from sources such as industrial burning and automobile exhausts
13. pollutant that forms in the atmosphere by chemical reactions with primary air pollutants, natural components in the air, or both
14. Vehicles and industry are major sources of air pollution in these areas (opposite of rural)
16. carbon-containing chemicals used in and emitted by vehicle engines and a wide variety of solvents and industrial processes; creates smog, and causes cancer
18. when warm air traps cooler air near the earth's surface and cause ground-level ozone