Which of the following occurrences does not cause air pollution in south and southeast asia?
a. factories releasing chemicals through smoke
b. a large amount of vehicles being used in a specific area
c. industries dumping chemicals into rivers
d. man-made or natural fires burning

C. The dumping of chemical into the river is not a cause for polluting the environment in Southeast Asian region.

Except pollution is option C rest of them are the cause of air pollution. The option C is cause of water pollution.

But the least polluting agent is the factories releasing chemical through smoke. Other have the huge impact in polluting the environment. The vehicles being used pollute the major cities and capital of different Asian countries in huge amount.

Similarly, the industrial plants that are dumped in river sides pollute the water ways. The jungle fire is also common in many Asian countries that produces mass carbon for the pollution.