Identify two causes of air pollution and its effects on human health?

Identify two causes of air pollution and its effects on human health?
 One can be: Burning fossil fuels which sends out Carbon Monoxide and nitrogen oxides
Two is: agricultural activities, such as the chemical they use (pesticides, that are acids)
Three is: Factories in which the gasses pollute, which can cause global warming
Four is: Mining operations, such as mining for oil