air pollution, when an individual breathe in too much contaminated air it may lead to Asthma
it can get contaminated by passing thought traits that are already contaminated
I think it depends how badly they were contaminated, but if you let them air for a day or two they should be fine.
Refrigerant contaminated with air won't function properly.
The homeowners had their water tested for contaminants before drinking from the faucet.
Secondhand smoke is a mixture of the smoke exhaled by smokers and the smoke that comes from the burning end of a cigarette, cigar, or pipe. It contains over 7,000 chemicals, many of which are toxic or cause cancer. Inhaling secondhand smoke can increase the risk of developing various health issues, including respiratory problems and heart disease.
The environment (soils, air, waters) was contaminated.
House flies