Sentences with phrase «presence of air pollutants»

Not exact matches

Formed in the presence of sunlight by water vapor and pollutants like ozone and nitrogen oxides, hydroxyl is hard to measure, because it persists for just a second in the air before it reacts away.

Air pollution is broadly defined as the presence in the air of any pollutant (or substance) that directly or indirectly endangers, interferes with, causes damages, degrades or alters human health, animal health, the environment, or ecosysteAir pollution is broadly defined as the presence in the air of any pollutant (or substance) that directly or indirectly endangers, interferes with, causes damages, degrades or alters human health, animal health, the environment, or ecosysteair of any pollutant (or substance) that directly or indirectly endangers, interferes with, causes damages, degrades or alters human health, animal health, the environment, or ecosystems.

The stagnant air caused by heat and humidity tends to trap airborne pollutants, such as car exhaust, which react in the presence of sunlight to form ozone, a main ingredient in smog.

Another study has found that idling vehicles do create serious pollution: «The concentration of air pollutants near schools may significantly exceed community background levels, particularly in the presence of idling school buses.»