Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Air pollution produced by the action of sunlight on hydrocarbons, nitrogen oxides, and other pollutants.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun
air pollution caused byphotochemical reactions involvinghydrocarbons ,nitrogen oxides and otherpollutants , especially in still air over cities
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