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Brief, basic information laid out in an easy-to-read format. May use informal language. (Includes most news articles)
Provides additional background information and further reading. Introduces some subject-specific language.
Lengthy, detailed information. Frequently uses technical/subject-specific language. (Includes most analytical articles)
The release of gases or particles into the atmosphere faster than the environment can naturally dissipate and dilute or absorb them is called air pollution. Such substances may cause undesirable health, economic, or aesthetic effects. Air pollution that remains outside in wide-open spaces can be just as dangerous as air pollution that gets trapped inside buildings, cars, or other enclosed spaces. Encyclopedia Britannica (Source)