Question

What are the top two sources of air pollution in big cities​

Answer 1

Answer:

co2 by incomplete combustin, co by refrigrator or car

Answer 2

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