Question

which of the following environmental factors is a concern in both indoor and outdoor environments?
a. air quality
b. acid rain
c. vehicle exhaust
d. industrial waste

Explanation:

Air quality affects both indoor (e.g., from pollutants like mold, chemicals) and outdoor (e.g., from smog, particulate matter) environments. Acid rain mainly impacts outdoor environments (e.g., soil, water bodies). Vehicle exhaust is an outdoor concern (emitted on roads). Industrial waste typically affects outdoor areas (land, water pollution from industrial sites).

Answer:

A. air quality