Answer:
in urban areas is the correct answer.
Explanation:
most human inputs of outdoor air pollutants occur in the urban areas.
its occur in the urban areas because of the following reasons
- In the urban areas, people are more depended on cars, vehicles and chemicals industries that are there which give rise to outdoor air pollutants.
- burning of fossil fuels in the power factory, in a machine vehicle and the industrial plants, generate large outdoor pollutants in the urban areas.
