Question

why do garages usually have low air quality? they are outside. chemicals are stored in garages.

Explanation:

Garages often store vehicles (which emit pollutants like carbon monoxide) and chemicals (like paints, solvents). Being outside doesn't inherently cause low air quality. Storing chemicals (and vehicle emissions) releases pollutants, reducing air quality. The option "Chemicals are stored in garages" is correct as it relates to pollutant sources.

Answer:

The correct option is: Chemicals are stored in garages.