Question

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

Explanation:

Garages often store chemicals like paints, solvents, and car maintenance products. These chemicals can release volatile organic compounds (VOCs) into the air, lowering air quality. Being outside (if considering ventilation, but garages are usually enclosed or semi - enclosed spaces) is not a valid reason as outside spaces generally have better air circulation. Storing chemicals is a major factor as they contribute pollutants.

Answer:

Chemicals are stored in garages.