POLLUTANT Particles, gases, or liquid aerosols in the atmosphere which have an undesirable effect on humans or their surroundings. Something unfavorable to health and life that has been added to the environment.
Pollutant- Strictly too much of any substance in the wrong place or at the wrong time is a pollutant. More specifically, atmospheric pollution may be defined as the ...
air pollutants"Substances that do not occur naturally in the atmosphere. Compare designated pollutant, criteria pollutants, air toxins.
Air pollutant - anthropogenic or otherwise unusual substance in the air. Usually harmful.
Air quality model - set of equations, such as a computer program, which predicts air quality, ...
Air Pollutants - Airborne particles and gases occurring in concentrations that endanger the health and well-being of organisms or disrupt the orderly functioning of the environment ...
Air pollutants Solid, liquid, or gaseous airborne substances that occur in concentrations high enough to threaten the health of people and animals, to harm vegetation and structures, or to toxify a given environment.
Air Pollutant
Harmful substance or product introduced into the atmosphere.
Air Pollution Potential ...
Pollutants- Harmful substances in the air, water, or soil.
Precipitation - Any form of water that falls from clouds and reaches Earth's surface.
Pressure- The force pushing on an area or surface.
Pollutants that can injure health, harm the environment, and cause property damage.
Primary air pollutant Substances that become pollutants immediately upon entering the atmosphere.
Secondary air pollutant This category of atmospheric pollutant refers to a substance or contaminant in the air which results from a chemical reaction between other constituents that are present.
Inversions can trap pollutants in the lower parts of the atmosphere, leading to poor visibility, especially in winter when wood fires increase the levels of particles in the atmosphere.
An inversion is present in the lower part of a cap. See sounding.
Acid rainCloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic (eg. pH < 5.6).AfternoonNoon to sunset.
A portable meteorological station used to provide weather data to the ALOHA air model that predicts how a cloud of pollutant gas might dispurse in the atmosphere after an accidental release. Also see CAMEO.
The model assumes that a pollutant plume is carried downwind from its emission source by a mean wind and that concentrations in the plume can be approximated by assuming that the highest concentrations occur on the horizontal and vertical midlines ...
CHCChanceChemistry ModelA computer model used in air pollution investigations that simulates chemical and photochemical reactions of the pollutants during their transport and diffusion.
Mixed LayerAn atmospheric layer, usually the layer immediately above the ground, in which pollutants are well mixed by convective or shear-produced turbulence.
AIR QUALITY STANDARDS The maximum level which will be permitted for a given pollutant. Primary standards are to be sufficiently stringent to protect the public health.
National Ambient Air Quality StandardsIn the United States, national standards for the ambient concentrations in air of different air pollutants designed to protect human health and welfare.
A box model is based on the assumption that pollutants are emitted into a box through which they are immediately and uniformly dispersed. The sides and bottom of the box are defined by the sidewalls and floor of the valley being studied.
photochemical smog Air pollution caused by chemical reactions among various substances and pollutants in the atmosphere.
For instance, researchers can identify and predict natural river-flow variability to assist engineers designing irrigation and water supply systems and make computer studies of pollutant and contaminant dispersion.
National Emissions Standards for Hazardous Air Pollutants (NESHAPS) (in the US)
(National Environmental Satellite, Data and Information Service: see) National Oceanic and Atmospheric Administration (NOAA) (in the US) ...
These primary air pollutants arise from the use of coal in the production of electricity, from base-metal smelting, and from fuel combustion in vehicles.
air - Mixture of gases forming the earth's atmosphere, consisting of nitrogen (~78 percent), oxygen (~21 percent), water vapor, and other trace gases such as carbon dioxide, helium, argon, ozone, or various pollutants.
Currently, the computation of the UV Index does not include the effects of variable surface reflection (e.g., sand, water, or snow), atmospheric pollutants or haze.
ACID RAIN: Cloud droplets combining with gaseous pollutants, such as oxides of sulfur and nitrogen, to make falling rain or snow acidic.
AIR MASS: A widespread body of air with consistent temperature and moisture characteristics.
The maximum level which will be permitted for a given pollutant. Primary standards are to be sufficiently stringent to protect the public health. Secondary standards must protect the public welfare, including property and aesthetics.
An unstable oxygen compound that is a pollutant at ground level, but that absorbs deadly ultraviolet rays in the stratosphere.
Ozone Hole
A thinning of the ozone layer over Antarctica and beyond which occurs each spring.
When there is a high concentration of particles in the atmosphere that are slightly larger than air molecules (like smoke, dust, and pollutants), shorter and intermediate wavelengths of light (violet, blue and yellow) are scattered away.
Acid Rain - falling rain (or snow) which has become acidic as a result of its combination with gaseous pollutants, such as oxides of sulfur and nitrogen
Advection - the transport of an atmospheric property (e.g., temperature) by the wind ...
Condensation nuclei - Tiny particles invisible to the human eye, such as dust, dirt, an pollutants, provide surfaces on which water molecules can condense and gather into water droplets ...
Smog- a mixture of smoke and fog; a natural fog contaminated by industrial pollutants.
Stable Air- air with little or no tendency to rise, that is usually accompanied by clear dry weather.
acid rain- rain with an abnormally high acid content caused by burning of fossil fuels, which release sulfur and nitrogen oxides. In the presence of sunlight, these pollutants form sulfates and nitrates that create sulfuric and nitric acids when ...
Deposition of acidic substances, resulting from long-range atmospheric transport of pollutants such as sulfur and nitrogen, which produce enhanced environmental acidification when they reach the Earth's surface.
It is formed in the upper atmosphere through the dissociation of oxygen molecules by solar radiation. In the lower troposphere, it is a pollutant which characterizes photochemical or Los Angeles-type smog.
This natural process is enhanced by man's added pollutants and can reach proportions at which a number of animal and plant species can be threatened with extinction, not to mention cause drastic changes in the Earth's natural weather patterns.
Smog: Originally a combination of smoke and fog, this term is now used to describe mixtures of pollutants in the atmosphere.
Ozone - A form of oxygen that has a weak chlorine odor. Ozone heats the upper atmosphere by absorbing ultraviolet from sunlight. In the troposphere, ozone is a pollutant, but in the stratosphere it filters out harmful ultraviolet radiation.
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 pollutant that adversely affects ...
an increase in temperature with height, or to the layer within which such an increase occurs. This occurs when warm air sits over cold air, possibly trapping moisture and pollutants in the surface air layer.
Where can I find more information relating to ozone concerns, both at stratospheric and near-surface altitudes?
A. For information on the chemistry, and current distribution, of low-altitude ozone (and other pollutants) in the UK, ...
Certified Weather Observer: Someone certified and approved by a designated federal agency to take and record weather observations.
CFC: Chloro-Fluro-Carbons: Produced by automobils and are air pollutants.
 See also: Air, Atmosphere, Surface, Water, Weather
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