Question

which action has a positive effect on air resources?
using fossil fuels
building new homes
walking to work or school
removing vegetation such as trees

Explanation:

Using fossil fuels releases pollutants that degrade air quality. Building new homes often involves construction emissions and increased energy use. Removing trees reduces natural air filtration. Walking instead of using motorized transport cuts greenhouse gas and pollutant emissions, benefiting air resources.

Answer:

walking to work or school