Question

an important source of air polution in highly urbanised areas is the​

Answer 1

Explanation:

The recently published study shows, based on the available information, that traffic (25%), combustion and agriculture (22%), domestic fuel burning (20%), natural dust and salt (18%), and industrial activities (15%) are the main sources of particulate matter contributing to cities' air pollution

Answer 2

Answer:

vehicles and factories

Explanation:

vehicles and factories are the main source of air pollution