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potentially affected by the proposed action and any
alternative.
Air Quality Ambient pollutant concentrations and their temporal and
spatial distribution.
Air Quality Control Region (AQCR) An EPA designated interstate or intrastate geographic region
that has significant air pollution or the potential for
significant air pollution and, due to topography, meteorology,
etc., needs a common air quality control strategy. The region
includes all the counties that are affected by or have sources
that contribute directly to the air quality of that region.
Air Quality Data Base A collection of information on the ambient air quality that
existed within an area during a particular time period. This
data is usually collected and published by the State Air
Pollution Control Agency.
Air Quality Model An algorithmic relationship between pollutant emissions and
pollutant concentrations used in the prediction of a project’s
pollutant impact.
Air Quality Monitor A device for measuring pollutant concentrations. One such
device is a Non-Dispersed Infrared Analyzer used to record
carbon monoxide concentrations.
Air Quality Standard A legal requirement for air quality, usually expressed in
terms of maximum allowable pollutant concentration,
averaged over a specified interval.
Ambient Concentrations Initial concentration sensed/measured at a
monitoring/ sampling site.
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Ambient Monitoring Systematic measurements of characteristics (e.g. pollutant
concentration and wind velocity) of the air at a fixed location.
Area of Potential Effects Under Section 106 of the National Historic Preservation Act, area
in which undertaking may affect any historic or cultural resources.
Area Source The agglomeration of many sources that have low emission rates
spread over a large area that are too numerous to treat individually.
An example of this type of source would be a parking lot.
Atmospheric Stability The resistance to or enhancement of vertical air movement related
to vertical temperature profile.
Attainment Area An area that meets NAAQS for a particular pollutant.
Averaging Time A period over which measurements of air quality parameters are
taken. Air quality standards are specified for averaging times of
one, three, eight and twenty four hours, as well as one year.
Background Concentration Pollutant concentrations due to (1) natural sources, (2) nearby
sources other than the one(s) currently under consideration and (3)
unidentified sources.
Calm For purpose of air quality modeling, calm is used to define the
situation when the wind is indeterminate with regard to speed or
direction.
Carbon Monoxide (CO) A colorless, odorless, toxic gas produced by the incomplete
combustion of organic materials used as fuels. CO is emitted as a
by product of essentially all combustion. Idling and low speed
mobile source operations, such as aircraft taxiing are the most
prevalent CO emission sources commonly found at airports.
Categorical Exclusion (CE or CATEX) A category of actions that do not individually or cumulatively have
a significant effect on human environment based on agency
experience. CE’s have been found to have no such effect in
procedures adopted by a Federal agency in implementation of these
regulations (40 CFR 1507.3) and do not require preparation of an
environmental assessment (EA), a FONSI, or an EIS.
CFRs Code of Federal Regulations.
Clean Air Act (CAA) The Federal law regulating air quality. The first Clean Air Act (CAA),
passed in 1967, required that air quality criteria necessary to protect the
public health and welfare be developed. Since 1967, there have been
several revisions to the CAA. The Clean Air Act Amendments of 1990
represent the fifth major effort to address clean air legislation.
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Clean Air Act Amendments of 1990
(CAAA)
The Clean Air Act Amendments of 1990 (CAAA) represent
the fifth major effort to address clean air legislation.
Revisions include significant strengthening of Clean Air Act,
especially by adding detailed requirements for Federal
actions to conform to State Implementation Plans (SIP),
expanding the list of hazardous air pollutants from eight to
189, and strengthening the operating permit program.
Complex Terrain Terrain exceeding the height of the stack being modeled.
Conformity The act of meeting Section 176(c)(1) of the CAAA that
requires Federal actions to conform to the SIP for air quality.
The action may not increase the severity of an existing
violation nor can it delay attainment of any standards.
Connected Actions Actions that are closely related and therefore should be
　
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