Question

which of the following significantly improved air quality in the united states? select one: a. the use of catalytic converters b. elimination of vocs in spray cans c. the elimination of chlorofluorocarbons d. eliminating lead in paint

Explanation:

Catalytic converters in vehicles reduce harmful emissions like carbon monoxide, hydrocarbons, and nitrogen oxides, significantly improving air - quality. Elimination of VOCs in spray cans mainly affects indoor and local air quality to some extent. Elimination of chlorofluorocarbons mainly addresses ozone - layer protection rather than direct air - quality improvement related to common pollutants. Eliminating lead in paint reduces lead exposure but not directly air - quality improvement in terms of common air pollutants.

Answer:

A. the use of catalytic converters