Pollutant

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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.^[1] Some pollutants are biodegradable and therefore will not persist in the environment in the long term.

Contents 1 Types of pollutants 1.1 Stock pollutants 1.2 Fund pollutants 2 Zones of influence 2.1 Horizontal zone 2.2 Vertical zone 3 Notable pollutants 4 Regulation 4.1 International 4.2 European Union 4.3 United States 5 See also 6 References

[edit] Types of pollutants

[edit] Stock pollutants

Pollutants that the environment has little or no absorptive capacity are called stock pollutants^[2] (eg. persistent synthetic chemicals, non-biodegradable plastics, and heavy metals). Stock pollutants accumulate in the environment over time. The damage they cause increases as more pollutant is emitted, and persists as the pollutant accumulates. Stock pollutants can create a burdon for future generations by passing on damage that persists well after the benefits received from incurring that damage have been forgotten^[3].

[edit] Fund pollutants

Fund pollutants are those for which the environment has some absorptive capacity. Fund pollutants do not accumulate in the environment unless the emission rate exceeds the receiving environment's absorptive capacity^[4] (eg. carbon dioxide, which is absorbed by plants and oceans). Fund pollutants are not destroyed, but rather converted into less harmful substances, or diluted/dispersed to non-harmful concentrations^[5].

[edit] Zones of influence

Pollutants can also be defined by their zones of influence, both horizonally and vertically^[6].

[edit] Horizontal zone

The horizonal zone refers to the the area that is damaged by a pollutant. Local pollutants cause damage near the emission source. Regional pollutants cause damage further from the emission source^[7].

[edit] Vertical zone

The vertical zone refers to whether the damage is ground-level or atmospheric. Surface pollutants cause damage by concentrations of the pollutant accumulating near the earth's surface (eg. water pollutants or air pollutants). Global pollutants cause damage by concentrations in the atmosphere (eg air pollutants such as carbon dioxide or chlorofluorocarbons)^[8].

Different pollution types with different zones of influence require different policy responses^[9].

[edit] Notable pollutants

Notable pollutants include the following groups:

• Greenhouse gases
• Heavy metals
• Persistent organic pollutants
• Polycyclic aromatic hydrocarbons
• Volatile organic compounds

[edit] Regulation

[edit] International

Pollutants can cross international borders and therefore international regulations are needed for their control. The Stockholm Convention on Persistent Organic Pollutants, which entered into force in 2004, is an international legally binding agreement for the control of persistent organic pollutants. Pollutant Release and Transfer Registers (PRTR) are systems to collect and disseminate information on environmental releases and transfers of toxic chemicals from industrial and other facilities.

[edit] European Union

The European Pollutant Emission Register is a type of PRTR providing access to information on the annual emissions of industrial facilities in the Member States of the European Union, as well as Norway.

[edit] United States

The National Ambient Air Quality Standards (NAAQS) are standards developed for outdoor air quality. The National Emissions Standards for Hazardous Air Pollutants are emission standards that are set by the Environmental Protection Agency which are not covered by the NAAQS.

[edit] See also

Look up pollutant in Wiktionary, the free dictionary.

• Conventional pollutant
• List of environmental issues
• Pollutant Standards Index

[edit] References