Air pullution

Harmful indoor air pollution, such as tobacco and cooking smoke, has been estimated to be up to what percent greater than outdoor pollution?

Particulate matter (solid particles and liquid droplets) can cause the most damage to human health when the molecules are smaller than:

What percentage of Europeans can't see a natural dark sky from their homes due to light pollution?

The ozone layer, which has been degraded by gases released human activities, is found in what part of Earth's atmosphere?

How much worse can the quality of indoor air be than that of the air outdoors?

Which of these is a potential outcome of long-term exposure to indoor air pollution?

When it comes to PM2.5 concentration, what levels are considered ‘’good’’ by US standards?

Last year, when Beijing experienced its ‘’airpocalypse,’’ by how much did its air-pollution levels exceed those deemed safe in the U.S.?