What is the 2 main sources of air pollution and what action the government take to reduce this types of air pollution?

The two main sources of air pollution are:

• Anthropogenic sources or also known as human activity--- Like nuclear weapons, toxic gases, germ ware fare and rocketry (gas from rockets).

• Natural sources---Like smoke and carbon monoxide from wild fires in the forests.

What the Singapore government has done about it:

• For human activities, they have tried to stop people from using their own cars and use public transport instead.

• But for natural sources, I do not know yet. Sorry.