Thick black smoke curling out of smokestacks horrible-tasting chemicals in your drinking water,pesticides in your food-these are examples of pollution. Pollution is any contamination of the environment which causes harm to the environment or the inhabitants of the environment. There are many kinds of pollution,and there are many pollutions. Some obvious kinds of pollution are pollution of air,soil,and water. Some less obvious,or less salient,kinds of pollution are radioactive,noise,light pollution,and green-house gass. Air pollution can be caused by particles, liquids, or gases that make the air harmful to breathe. Th
ere are two main types of air pollution: primary and secondary. Primary pollutants enter the air directly, like smoke from factories and car exhaust. Secondary pollutans are chemicals that mix together to pullute the air, like mixtures of emissions, or waste output, from vehicles and factory smoke that change to form more dangerous pollutants in the air and sunlight.