00:10
00:09
00:08
00:07
00:06
00:05
00:04
00:03
00:02
00:01
| an area within which the air frequently is confined or channeled, with all parts of the area thus being subject to similar conditions of air pollution |
| air pollution containing ozone and reactive chemical compounds formed by sunlight on nitrogen oxides and hydrocarbons, often from auto exhaust |
| isogram (ī'sə-grām') Pronunciation Key
See isoline. |