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?

86%

62%

12%

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

10 micrometers

80 micrometers

1 centimeter

50 centimeters

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

99.9%

54%

87.9%

31%

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

Tropospheres

Hellospheres

Mesospheres

Stratosphere

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

Ten times as bad

Four times as bad

Twice as bad

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

Coma

Heart disease

Hair loss

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

3 micrograms per cubic meter

12 micrograms per cubic meter

23 micrograms per cubic meter

36 micrograms per cubic meter

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

10 times

30 times

70 times

90 times

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