Pollutant [noun]

These pollutants can come from industrial facilities as well as from power plants and vehicles.

While researchers are not sure how this happens, they believe air pollutants could prevent the body’s immune system from being able to tell the difference between a harmless allergen and a dangerous particle, like a virus.

In summertime, asphalt in cities might contribute more to pollutants called secondary organic aerosols than cars and trucks.

To be clear, this finding applied to just one type of pollutant.

A new study published yesterday in Science Advances finds that asphalt pavement and roofing give off lots of gases that go on to form air pollutants.

Scientists had worried that such pollutants might be harming monarchs.

However, the watershed, along with all its pollutants, drains into the Tijuana River Valley in San Diego County.

What pollutants billowed into the air as a Navy ship burned in San Diego harbor earlier this month are finally now public – and so are a number of violations against the military for emitting them.