| A | B |
|---|
| Acid rain | pollution that can corrode buildings and lower the pH of lakes and streams |
| Scrubber | removes sulfur by dissolving gases in water |
| Sewage | water containing human waste |
| Nonpoint source pollution | pollution entering water from a specific location |
| Acid | substance with a pH lower than seven |
| Pesticide | chemical used by farmers and homeowners |
| Carbon monoxide | a gas you can't see or smell that replaces oxygen in the blood |
| Base | substance with a pH above seven |
| Photochemical smog | forms when nitrogen and oxygen compounds react with the help of sunlight |
| Point source pollution | pollution entering water from a specific location |
| Particulate matter | fine solids in the air that irritate and damage lungs |
| Montreal Protocol | by 1999, 184 countries had signed this agreement made during a meeting in Canada |
| Clean Air Act | passed by the US Congress in 1990 to adress problems of air polution |
