Toxic air pollutants are poisonous substances in the air that come from natural or manmade sources and can harm the environment or your health.
(Toxic air pollutants; are; poisonous substances in the air that come from natural or manmade sources and can harm the environment or your health) (poisonous substances in the air; come; from natural or manmade sources) (poisonous substances in the air; can harm; the environment or your health)
Toxic air pollutants poisonous substances in the air poisonous substances in the air
are come can harm
poisonous substances in the air that come from natural or manmade sources and can harm the environment or your health
from natural or manmade sources
the environment or your health