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I WANT NOTE FOR AIR POLLUTION IN BOTANY . I CAN'T UNDERSTAND THE NOTE IN TEXT?
Air pollution includes all contaminants found in the atmosphere.  These dangerous substances can be either in the form of gases or particles. Air pollution can be found both outdoors and indoors.  Pollutants can be trapped inside buildings, causing indoor pollution that lasts for a long time.
The sources of air pollution are both natural and human-based.
Air pollution is caused by the presence of chemicals, particulate matter, or biological materials in the air which harms humans and other living organisms. It can also damage the natural environment.

Air pollution causes depletion of ozone in the stratosphere which endangers human health as well as the Earth’s ecosystems. Air pollutants can be in the form of solid particles, liquid droplets, or gases. They could be natural or man-made.

Pollutants can be classified as either primary or secondary. Substances which are directly emitted due to certain processes like ash from a volcanic eruption, or carbon monoxide gas from a motor vehicle exhaust or sulfur dioxide released from factories- are primary pollutants.

Secondary pollutants are not emitted directly. They form in the air when primary pollutants react or interact. One example is ground level ozone. There are also pollutants that are both primary and secondary: that is, they are both emitted directly and formed from other primary pollutants. About 4 percent of deaths in the United States is the result of air pollution, says a study. Air pollution can cause skin and eye allergies, cancer, lung disease, etc.


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