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A pollutant is a contaminant that adversely affects the water, the land or the air, and that cause damage to the health of humans or ecosystems. Emissions, waste and chemicals are all examples.
Help us improve this term by expanding its description ...

Pollutant Standard Index (PSI)
Indicator of one or more pollutants that may be used to inform the public about the potential for adverse health effects from air pollution in major cities.
Source: Terms of the Environment ...

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Global Warming ...

The moment that pollutants in soils become dissolved in natural waters, their potential for transport is greatly magnified, as is the likelihood that people will ingest them.

A pollutant determined to be hazardous to human health and regulated under EPA's National Ambient Air Quality Standards. The 1970 amendments to the Clean Air Act require EPA to describe the health and welfare impacts of a pollutant as the "criteria" for inclusion in the regulatory regime.

A harmful substance emitted into the air, water or soil.
Energy that passes from a warm object to a cooler one, like energy from the Sun to the Earth - sunlight.

a chemical or substance that causes harm in the environment
Polychlorinated biphenyls
see PCBs ...

~:  Anything which alters the physical, chemical, or biological properties of water making it harmful or undesirable for use.
PrecipitationWater received on Earth directly from clouds as rain, hail, sleet, or snow.

~: A contaminant at a concentration high enough to endanger the life of organisms.

Any undesirable solid, liquid or gaseous matter in a solid, liquid or gaseous environmental medium.
Note 1: ‘Undesirability’ is often concentration-dependent, low concentrations of most substances being tolerable or even essential in many cases.

~ -- Any substance that, when present in a hydrologic system at sufficient concentration, degrades water quality in ways that are or could become harmful to human and/or ecological health or that impair the use of water for recreation, agriculture, industry, commerce, ...

~ Pathways: Avenues for distribution of ~s. In most buildings, for example, HVAC systems are the primary pathways, although all building components can interact to affect how air movement distributes ~s.

~ Pathways: Avenues for distribution of ~s in a building. HVAC systems are the primary pathways in most building, however all building components interact to affect how air movement distributes ~s.

~ Any substance introduced into the environment that adversely affects the usefulness of a resource.
~ standard index (PSI) Measure of adverse health effects of air pollution levels in major cities.

~ Standard Index (PSI)
Measure of adverse health effects of air pollution levels in major cities.(1) ...

~ - Contaminant that negatively impacts the physical, chemical or biological properties of the environment.
pond - A small natural body of standing fresh water filling a surface depression, usually smaller than a lake.

~: an impurity (contaminant) that causes an undesirable change in the physical, chemical, or biological characteristics of the air, water, or land that may be harmful to or affect the health, survival, or activities of humans or other living organisms.

~ Standards Index (PSI): A numerical index formerly used for reporting severity of air pollution levels to the general public. The PSI incorporated the five criteria ~s -- ozone, PM10, carbon monoxide, sulfur dioxide, and nitrogen dioxide -- into one single index.

~ is, strictly, too much of any substance in the wrong place or at the wrong time.

~ : Generally, any substance introduced into the environment that adversely affects the usefulness of a resource.

Air ~ - Any substance in air that could, in high enough concentration, harm humans, animals, vegetation or material. ~s may include almost any natural or artificial composition of matter capable of being airborne.

Marine ~: A material which is listed in appendix B to ยง 172.

primary ~s
Chemicals released directly into the air in a harmful form.
primary productivity ...

primary ~s: Chemicals that are emitted into the environment. Compare with secondary ~s.
primary producer: An autotrophic organism. Autotrophs are the biological foundation of ecological productivity. See also primary production.

~s are, however, also dispersed by wind and are therefore not always limited to the basin. The Baltic Sea basin receives airborne ~s from Western Europe and exports some to Russia and the Ukraine. Thus we are also part of the global environment, with both responsibilities and rights.

UK ~ Release and Transfer Register (PRTR)
Environment Agency's Pollution Inventory (PI)
SEPA Scottish ~ Release Inventory (SPRI)
UK-AIR website ...

The ~s that industrial facilities discharge become airborne ~s that are washed out of the atmosphere and deposite in rain or snowfall. This type of nonpoint source pollution can result in acid rain, which can slow forest growth and contaminate soil.
(top) ...

Air ~s for which standards for safe levels of exposure have been set under the Clean Air Act. Current criteria ~s are sulfur dioxide, particulate matter, carbon monoxide, nitrogen oxides, ozone and lead.
Cumulative impact
The term cumulative impact is used in several ways: ...

Air ~s can travel long distances from their source. During this transport, secondary ~s such as acid rain and ozone are produced. Tree foliage may act as a filter, concentrating the pollution.

Air ~s that contribute to smog and acid rain. Nitrogen oxides occur naturally in the environment but are also generated by the combustion of fuels.
nutrient ...

Air ~s which are not covered by ambient air quality standards but which, as defined in the Clean Air Act, may reasonably be expected to cause or contribute to irreversible illness or death.

Toxic ~s- Materials that cause death, disease, or birth defects in organisms that ingest or absorb them. The quantities and exposures necessary to cause these effects can vary widely.

Another ~ associated with climate change is sulfur dioxide, a component of smog. Sulfur dioxide and closely related chemicals are known primarily as a cause of acid rain. But they also reflect light when released in the atmosphere, which keeps sunlight out and causes Earth to cool.

4.1 Which ~s are present in outdoor air?
4.2 What respiratory diseases can outdoor pollution lead to?
4.3 Does exposure to pollen lead to respiratory allergies?
The source document for this Digest states: ...

Secondary ~s
~s generated in the atmosphere as a result of chemical reactions involving primary ~s.
See Carbon Sink.

Primary Air ~: a ~ dumped directly into the air. (Photochemical smog is a secondary air ~: it is chemically derived from primary pollution.) ...

The National ~ Discharge Elimination System (NPDES) is a permit program that controls water pollution by regulating point sources that discharge ~s into waters of the United States.

Photochemical ~s Chemicals which react photochemically (in the presence of sunlight) to destroy ozone in the stratosphere.

Photophosphorylation The synthesis of the energy storage compound adenosine triphosphate (ATP) from adenosine diphosphate (ADP) using solar energy.

Hazardous air ~s-Air ~s that may reasonably be expected to cause or contribute to irreversible illness or death as defined under the Clean Air Act. These ~s include asbestos, beryllium, mercury, benzene, coke-oven emissions or radionuclides, and vinyl chloride. (CEHN) ...

NPI = National ~ Inventory
nutrients = A substance that provides plants food, includes vitamins and minerals
NWC = National Water Commission; See NWC's Water Dictionary ...

NPDES: National ~ Discharge Elimination System. A federal permit authorized by the Clean Water Act, Title IV, which is required for discharge of ~s to navigable waters of the United States, which includes any discharge to surface waters-lakes, streams, rivers, bays, the ocean, ...

Acid Rain Rain or any form of precipitation of dilute solutions of strong mineral acids, created by the mixing in the atmosphere of ~s, typically sulfur dioxide and nitrogen oxides compounds, with naturally occurring oxygen and water vapor.

air toxics Generally defined as air ~s known or suspected to cause cancer or other serious health problems. They also may disrupt reproductive processes, cause birth defects and can cause serious environmental and ecological problems.

Lifetime (atmospheric) The lifetime of a greenhouse gas refers to the approximate amount of time it would take for the anthropogenic increment to an atmospheric ~ concentration to return to its natural level (assuming emissions cease) as a result of either being converted to another ...

If nothing new is disclosed from these new chemical analysis, the client is advised to consider alternative treatments (incineration, chemical reaction, filtering, etc.) from other vendors, but if one or more new ~s ARE discovered, ...

parts per million (ppm) the unit commonly used to represent the degree of ~ concentration where the concentrations are small. Larger concentrations are given in percentages. 1ppm = 1mg/L.

Near the ground, it is a ~ that comes from car exhausts, irritating the lungs. ozone layer A thin layer of ozone high in the atmosphere that prevents high energy UV radiation from getting to earth. Without it all plants and animals would die.

photochemical smog Air pollution caused by chemical reactions among various substances and ~s in the atmosphere. photoelectric Of or relating to the electrical effects of light, including the emission of electrons, the generation of a voltage, or a change in resistance.

point source A stationary source or fixed facility from which ~s are discharged. Compare non-point source. ~ Any substance introduced into the environment that adversely affects the usefulness of a resource. pore space The space between mineral grains in a porous medium.

Most NPS pollution comes from ~s being washed into a waterbody by rainfall and snowmelt. There are many types of ~s, both human-made and natural, that wash into our lakes, rivers, streams, wetlands, and coastal waters and percolated into our groundwater every year.

Certain kinds of air ~s, like ozone, can make asthma and other lung conditions worse. Ozone found high in the atmosphere is called "good ozone" because it protects life on Earth from the sun's harmful ultraviolet rays.

Persistant organic ~
A complex organic chemical which resists decomposition in the environment and can migrate over great distances, which Bioaccumulates and Biomagnifies, ...

The EPA's rationale for deregulating lead as an air ~ is like a case study for convoluted logic.

Polluted runoff might result from ~s getting into surface waters in the course of precipitation events. It's not as unheard of as you may think. Everyday human actions deposit pollution on roads, turf, rooftops, farm fields along with surfaces.

Chapter 5 - Indoor Air ~s and Toxic Materials
Chapter 6 - Housing Structure
Chapter 7 - Environmental Barriers
Chapter 8 - Rural Water Supplies and Water-quality Issues
Chapter 9 - Plumbing
Chapter 10 - On-site Wastewater Treatment
Chapter 11 - Electricity ...

Air Pollution - The presence in the outdoor atmosphere of one or more air ~s or any combination thereof in such quantities and of such characteristics and duration as to be, or be likely to be, injurious to public welfare, to the health of human, plant or animal life, or to property, ...

Air Quality Standards
The level of selected ~s set by law that may not be exceeded in outside air. Used to determine the amount of ~s that may be emitted by industry.
A mineral fiber that can pollute air or water and cause cancer or asbestosis when inhaled. ...

Ambient Charge : A form of tax on non uniformly mixed ~s. It is calculated to be the same in terms of the emission's impact on ambient environmental quality at some receptor site.

Fugitive Emissions
Air ~s released to the air other than those from stacks or vents; typically small releases from leaks in plant equipment such as valves, pump seals, flanges, sampling connections, etc.
A pesticide used to control or destroy fungi on food or grain crops.

Residual: The amount of a ~ remaining in the environment after a natural or technological process has taken place, e.g., the sludge remaining after initial wastewater treatment, or particulates remaining in the air after the air passes through a scrubbing or other process.

National ~ Discharge Elimination System (NPDES)
National ~ Release Inventory or NPRI
National Priorities List or NPL
National Response Center or NRC
National Response System or NRS
National Response Team or NRT ...

Long Range Transport of Atmospheric ~s (LRTAP)
A program of federal, provincial and territorial governments in western and northern Canada to research, monitor and manage acid deposition and other atmospheric ~s.
Megatonne ...

Carbon Monoxide (n) - a ~ that is produced primarily by motor vehicles. It can reduce a person's ability to think clearly, and causes visual impairment and headaches if high enough concentrations are experienced for a long period of time.

Unlike most conventional ~s, GHGs mix well in the atmosphere and can travel around the planet quickly. As a result, it doesn't really matter from the standpoint of global warming mitigation where a reduction takes place.

Note that anthropogenic emissions of other ~s - notably sulphate aerosol - exert a cooling effect; this can account for the plateau/cooling seen in the temperature record in the middle of the 20th century [16].
Alternative theories
Solar variation theory ...

Local Exhaust Ventilation - involves the capture of ~s at the source.
Material Causing Immediate and Serious Toxic Effects - classified under "Poisonous and Infectious Material" as toxic or very toxic based on information such as the LD50 or LC50.

Two common air ~s acidify rain: sulphur dioxide and nitrogen oxide. When the environment cannot neutralize the acid being deposited, damage occurs.
(Environment Canada. Canadian Pollution Prevention Information Clearinghouse. Glossary »»).

Strictly, too much of any substance in the wrong place or at the wrong time is a ~.

Smog - a dense, discolored radiation fog containing large quanities of soot, ash, and gaseous ~s such as sulfur dioxide and carbon dioxide, responsible for human respiratory ailments.

Buoyant forces remove heat generated by occupants and equipment, as well as odors and ~s, all of which stratify under the ceiling and are extracted from the space by return or exhaust fans.

Assimilative Capacity: natural ability of soil and water to use and decompose potential ~s without harmful effects to the environment.
Available Nitrogen: amount of nitrogen present as either nitrate or ammonium, forms which can be readily taken up by plants.

Non-point Source: Diffuse, overland runoff containing ~s. Includes runoff collected in storm drains.
Nymph: Immature form of insects such as stoneflies and mayflies that do not pupate.

An illegal method of getting rid of household waste, possibly in an attempt to save on bin charges, that releases levels of ~s into the air, so harming air quality and risking the health of those burning the waste and of their neighbours.
BER ...

Pollution Plume: an area of a stream or aquifer containing degraded water resulting from migration of a ~. It extends from the source of contamination to another point in the direction of the water flow.

acid rain - the precipitation of dilute solutions of strong mineral acids, formed by the mixing in the atmosphere of various industrial ~s -- primarily sulfur dioxide and nitrogen oxides -- with naturally occurring oxygen and water vapor.

Assimilative Capacity - The ability of air, a natural body of water, or soil to effectively degrade and/or disperse chemical substances. If the rate of introduction of ~s into the environment exceeds its assimilative capacity for these substances, ...

Best available control technology An emission limitation, including a visible emissions standard, based on the maximum possible reduction of an air ~.
Billet A bar of steel or iron that is in an intermediate manufacturing stage.

Quantitation limits: in general, the limits of a test's accuracy in measuring the amount of a ~.

Ozone Hole: a once-natural springtime thinning in stratospheric ozone over Antarctica, but now enlarged by CFCs and other ~s into a hole the size of the Moon.

Toxicogenomics: The collection, interpretation, and storage of information about gene and protein activity in order to identify toxic substances in the environment, and to help treat people at the greatest risk of diseases caused by environmental ~s or toxicants.

In the stratosphere, ozone has beneficial properties where it forms an ozone shield that prevents dangerous radiation from reaching the Earth's surface. Closer to the planet's surface, ozone is considered an air ~ that adversely affects humans, plants and animals as well as a greenhouse gas.

Nitrogen oxides are produced in the emissions of vehicle exhausts and from power stations. In the atmosphere, nitrogen oxides can contribute to formation of photochemical ozone (smog), can impair visibility, and have health consequences and are considered ~s.

Activities All inspection, test and monitoring work related to environmental management.
Waste An output with no marketable value that is discharged to the environment. Normally the term "waste" refers to solid or liquid materials.
Waterborne Waste Discharge to water of ~s.

See also: See also: What is the meaning of Environment, Air, Water, Environmental, Health?

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