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Air pollution can occur naturally or be caused by human activities. [3] Air pollution causes around 7 million deaths each year. [4] [5] It is a significant risk factor for a number of pollution-related diseases, including heart disease, stroke, chronic obstructive pulmonary disease (COPD), asthma and lung cancer.
The Air Pollution Control Act of 1955 (Pub. L. 84–159, ch. 360, 69 Stat. 322) was the first U.S. federal law to address the national environmental problem of air pollution. This was "an act to provide research and technical assistance relating to air pollution control". [2]
Pollution and other stress agents can be monitored by measuring any of several variables in animals: the concentration of toxins in animal tissues; the rate at which deformities arise in animal populations; behaviour in the field or in the laboratory; [25] and by assessing changes in individual physiology.
Particulate pollution is pollution of an environment that consists of particles suspended in some medium. There are three primary forms: atmospheric particulate matter, [1] marine debris, [2] and space debris. [3] Some particles are released directly from a specific source, while others form in chemical reactions in the atmosphere.
Various definitions of pollution exist, which may or may not recognize certain types, such as noise pollution or greenhouse gases.The United States Environmental Protection Administration defines pollution as "Any substances in water, soil, or air that degrade the natural quality of the environment, offend the senses of sight, taste, or smell, or cause a health hazard.
The polluter pays principle (PPP) has been doubted in cases where no one recognized that a type of pollution posed any danger until after the pollution began. An example occurs in the history of climate change science which shows that considerable carbon dioxide was emitted into the atmosphere by industrialized countries before there was ...
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Smog, or smoke fog, is a type of intense air pollution.The word "smog" was coined in the early 20th century, and is a portmanteau of the words smoke and fog [1] to refer to smoky fog due to its opacity, and odor. [2]