Question

which statement describes indoor air pollution? smog is a common source of indoor air pollution. ultrafine particles are classified as indoor air pollutants. indoor air pollution does not affect symptoms for people with asthma. chemicals from industrial power plants cause indoor air pollution.

Explanation:

• Smog is an outdoor air pollutant, not a common indoor source.
• Ultrafine particles can originate from indoor sources like cooking, candles, or electronic devices, so they are classified as indoor air pollutants.
• Indoor air pollution worsens asthma symptoms, so the statement claiming no effect is false.
• Industrial power plant chemicals are outdoor pollution sources, not direct indoor causes.

Answer:

Ultrafine particles are classified as indoor air pollutants.