Air pollution
What is it?
Air pollution can be created by both manmade and natural sources. Natural sources include windblown or kicked-up dust, dirt and sand, volcanic smoke, and burning materials. Manmade sources, meaning that pollution is created by the actions of human beings, tend to be the leading contributor to air pollution in cities and are inherently more able to be influenced by regulations.Those human sources primarily include various forms of combustion, such as from gas-powered transportation (planes, trains, and automobiles) and industrial businesses (power plants, refineries, and factories), biomass burning (the burning of plant matter or coal for heating, cooking, and energy), and agriculture.