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POLLUTION is the introduction of contaminants into the natural environment that cause adverse change. Pollution
Pollution
can take the form of chemical substances or energy , such as noise, heat or light. Pollutants , the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution
Pollution
is often classed as point source or nonpoint source pollution .

CONTENTS

* 1 History * 2 Urban pollution * 3 Forms of pollution * 4 Pollutants * 5 Cost of pollution * 6 Sources and causes

* 7 Effects

* 7.1 Human health * 7.2 Environment * 7.3 Environmental health information * 7.4 Worker productivity

* 8 Regulation and monitoring

* 9 Pollution control
Pollution control

* 9.1 Practices * 9.2 Pollution control
Pollution control
devices

* 10 Perspectives * 11 Greenhouse gases and global warming * 12 Most polluting industries * 13 World’s Worst Polluted Places * 14 See also * 15 References * 16 External links

HISTORY

Air pollution
Air pollution
has always accompanied civilizations. Pollution
Pollution
started from prehistoric times when man created the first fires. According to a 1983 article in the journal _Science,_ "soot " found on ceilings of prehistoric caves provides ample evidence of the high levels of pollution that was associated with inadequate ventilation of open fires." Metal forging appears to be a key turning point in the creation of significant air pollution levels outside the home. Core samples of glaciers in Greenland indicate increases in pollution associated with Greek, Roman and Chinese metal production, but at that time the pollution was comparatively small and could be handled by nature.

URBAN POLLUTION

Air pollution
Air pollution
in the US, 1973

The burning of coal and wood, and the presence of many horses in concentrated areas made the cities the cesspools of pollution. The Industrial Revolution brought an infusion of untreated chemicals and wastes into local streams that served as the water supply. King Edward I of England banned the burning of sea-coal by proclamation in London in 1272, after its smoke became a problem. But the fuel was so common in England that this earliest of names for it was acquired because it could be carted away from some shores by the wheelbarrow.

It was the industrial revolution that gave birth to environmental pollution as we know it today. London
London
also recorded one of the earlier extreme cases of water quality problems with the Great Stink
Great Stink
on the Thames of 1858, which led to construction of the London
London
sewerage system soon afterward. Pollution
Pollution
issues escalated as population growth far exceeded view ability of neighborhoods to handle their waste problem. Reformers began to demand sewer systems, and clean water.

In 1870, the sanitary conditions in Berlin were among the worst in Europe. August Bebel recalled conditions before a modern sewer system was built in the late 1870s: "Waste-water from the houses collected in the gutters running alongside the curbs and emitted a truly fearsome smell. There were no public toilets in the streets or squares. Visitors, especially women, often became desperate when nature called. In the public buildings the sanitary facilities were unbelievably primitive....As a metropolis, Berlin did not emerge from a state of barbarism into civilization until after 1870."

The primitive conditions were intolerable for a world national capital, and the Imperial German government brought in its scientists, engineers and urban planners to not only solve the deficiencies but to forge Berlin as the world's model city. A British expert in 1906 concluded that Berlin represented "the most complete application of science, order and method of public life," adding "it is a marvel of civic administration, the most modern and most perfectly organized city that there is."

The emergence of great factories and consumption of immense quantities of coal gave rise to unprecedented air pollution and the large volume of industrial chemical discharges added to the growing load of untreated human waste. Chicago and Cincinnati were the first two American cities to enact laws ensuring cleaner air in 1881. Pollution
Pollution
became a major issue in the United States in the early twentieth century, as progressive reformers took issue with air pollution caused by coal burning, water pollution caused by bad sanitation, and street pollution caused by the 3 million horses who worked in American cities in 1900, generating large quantities of urine and manure. As historian Martin Melosi notes, The generation that first saw automobiles replacing the horses saw cars as "miracles of cleanliness.". By the 1940s, however, automobile-caused smog was a major issue in Los Angeles.

Other cities followed around the country until early in the 20th century, when the short lived Office of Air Pollution
Pollution
was created under the Department of the Interior. Extreme smog events were experienced by the cities of Los Angeles
Los Angeles
and Donora, Pennsylvania in the late 1940s, serving as another public reminder. Air pollution would continue to be a problem in England, especially later during the industrial revolution, and extending into the recent past with the Great Smog of 1952 .

Awareness of atmospheric pollution spread widely after World War II, with fears triggered by reports of radioactive fallout from atomic warfare and testing. Then a non-nuclear event, The Great Smog of 1952 in London, killed at least 4000 people. This prompted some of the first major modern environmental legislation, The Clean Air Act of 1956 .

Pollution
Pollution
began to draw major public attention in the United States between the mid-1950s and early 1970s, when Congress passed the Noise Control Act , the Clean Air Act , the Clean Water Act and the National Environmental Policy Act . Smog Pollution
Pollution
in Taiwan
Taiwan

Severe incidents of pollution helped increase consciousness. PCB dumping in the Hudson River
Hudson River
resulted in a ban by the EPA on consumption of its fish in 1974. Long-term dioxin contamination at Love Canal starting in 1947 became a national news story in 1978 and led to the Superfund legislation of 1980. The pollution of industrial land gave rise to the name brownfield , a term now common in city planning .

The development of nuclear science introduced radioactive contamination , which can remain lethally radioactive for hundreds of thousands of years. Lake Karachay , named by the Worldwatch Institute as the "most polluted spot" on earth, served as a disposal site for the Soviet Union throughout the 1950s and 1960s. Chelyabinsk , Russia, is considered the "Most polluted place on the planet".

Nuclear weapons
Nuclear weapons
continued to be tested in the Cold War
Cold War
, especially in the earlier stages of their development. The toll on the worst-affected populations and the growth since then in understanding about the critical threat to human health posed by radioactivity has also been a prohibitive complication associated with nuclear power . Though extreme care is practiced in that industry, the potential for disaster suggested by incidents such as those at Three Mile Island and Chernobyl
Chernobyl
pose a lingering specter of public mistrust. Worldwide publicity has been intense on those disasters. Widespread support for test ban treaties has ended almost all nuclear testing in the atmosphere.

International catastrophes such as the wreck of the Amoco Cadiz oil tanker off the coast of Brittany
Brittany
in 1978 and the Bhopal disaster in 1984 have demonstrated the universality of such events and the scale on which efforts to address them needed to engage. The borderless nature of atmosphere and oceans inevitably resulted in the implication of pollution on a planetary level with the issue of global warming. Most recently the term persistent organic pollutant (POP) has come to describe a group of chemicals such as PBDEs and PFCs among others. Though their effects remain somewhat less well understood owing to a lack of experimental data, they have been detected in various ecological habitats far removed from industrial activity such as the Arctic, demonstrating diffusion and bioaccumulation after only a relatively brief period of widespread use.

A much more recently discovered problem is the Great Pacific Garbage Patch , a huge concentration of plastics, chemical sludge and other debris which has been collected into a large area of the Pacific Ocean by the North Pacific Gyre . This is a less well known pollution problem than the others described above, but nonetheless has multiple and serious consequences such as increasing wildlife mortality, the spread of invasive species and human ingestion of toxic chemicals. Organizations such as 5 Gyres have researched the pollution and, along with artists like Marina DeBris , are working toward publicizing the issue.

Pollution
Pollution
introduced by light at night is becoming a global problem, more severe in urban centres, but nonetheless contaminating also large territories, far away from towns.

Growing evidence of local and global pollution and an increasingly informed public over time have given rise to environmentalism and the environmental movement , which generally seek to limit human impact on the environment .

FORMS OF POLLUTION

The Lachine Canal in Montreal
Montreal
, Quebec
Quebec
, Canada. Blue drain and yellow fish symbol used by the UK Environment Agency to raise awareness of the ecological impacts of contaminating surface drainage.

The major forms of pollution are listed below along with the particular contaminant relevant to each of them:

* Air pollution
Air pollution
: the release of chemicals and particulates into the atmosphere. Common gaseous pollutants include carbon monoxide , sulfur dioxide , chlorofluorocarbons (CFCs) and nitrogen oxides produced by industry and motor vehicles. Photochemical ozone and smog are created as nitrogen oxides and hydrocarbons react to sunlight. Particulate matter , or fine dust is characterized by their micrometre size PM10 to PM2.5.

* Light pollution
Light pollution
: includes light trespass, over-illumination and astronomical interference. * Littering : the criminal throwing of inappropriate man-made objects, unremoved, onto public and private properties. * Noise pollution : which encompasses roadway noise , aircraft noise , industrial noise as well as high-intensity sonar . * Soil contamination occurs when chemicals are released by spill or underground leakage. Among the most significant soil contaminants are hydrocarbons , heavy metals , MTBE , herbicides , pesticides and chlorinated hydrocarbons . * Radioactive contamination , resulting from 20th century activities in atomic physics , such as nuclear power generation and nuclear weapons research, manufacture and deployment. (See alpha emitters and actinides in the environment .) * Thermal pollution , is a temperature change in natural water bodies caused by human influence, such as use of water as coolant in a power plant. * Visual pollution , which can refer to the presence of overhead power lines , motorway billboards , scarred landforms (as from strip mining ), open storage of trash, municipal solid waste or space debris . * Water pollution , by the discharge of wastewater from commercial and industrial waste (intentionally or through spills) into surface waters ; discharges of untreated domestic sewage , and chemical contaminants, such as chlorine , from treated sewage; release of waste and contaminants into surface runoff flowing to surface waters (including urban runoff and agricultural runoff, which may contain chemical fertilizers and pesticides ); waste disposal and leaching into groundwater ; eutrophication and littering. * Plastic pollution : involves the accumulation of plastic products in the environment that adversely affects wildlife, wildlife habitat, or humans.

POLLUTANTS

Main article: Pollutant

A pollutant is a waste material that pollutes air, water or soil. Three factors determine the severity of a pollutant: its chemical nature, the concentration and the persistence.

COST OF POLLUTION

Pollution
Pollution
has cost. Manufacturing
Manufacturing
activities that cause air pollution impose health and clean-up costs on the whole society, whereas the neighbors of an individual who chooses to fire-proof his home may benefit from a reduced risk of a fire spreading to their own houses. If external costs exist, such as pollution, the producer may choose to produce more of the product than would be produced if the producer were required to pay all associated environmental costs. Because responsibility or consequence for self-directed action lies partly outside the self, an element of externalization is involved. If there are external benefits, such as in public safety , less of the good may be produced than would be the case if the producer were to receive payment for the external benefits to others.

SOURCES AND CAUSES