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operation.
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Nonattainment Area (NAA) Any geographic area of the United States that is in violation
of any NAAQS and therefore has been designated as
nonattainment under the CAA.
Notice of Availability (NOA) A notice printed in the Federal Register announcing that an
EIS is available for public comment.
Notice of Intent (NOI) A brief notice placed in the Federal Register by the Federal
agency noting that the agency will prepare an EIS. The NOI
describes the proposed action and possible alternatives,
details the proposed scoping process (i.e., location and time
of meetings), and provides the name and address of a point of
contact within the Federal agency to answer questions about
the proposed action and the EIS.
Ozone (O3) A colorless, toxic gas formed by the photochemical reactions
in the atmosphere of VOCs with the oxides of nitrogen.
Ozone commonly is referred as “Smog”. Ozone is not
emitted directly by any airport.
Pasquill Stability Classification A method of classifying atmospheric stability based on
incoming solar radiation and wind speed. The stability
classifications range from A stability (extremely unstable
conditions) to F stability (moderately stable conditions).
Plume The spreading pollutants emitted by a fixed source such as a
smokestack.
PM-10 PM-10, a criteria pollutant, are fine particles less than 10
micrometers in diameter. PM-10 includes solid and liquid
material suspended in the atmosphere formed as a result of
incomplete combustion. Aircraft are the primary source of
PM-10 emissions at airport.
Point Source A pollutant source that is fixed to the ground and that
releases pollutants through a relatively small area. Common
stationary sources at airport include boilers, heaters,
incinerators and fuel storage tanks.
PPM Parts per million (106) by volume.
Precursor A chemical compound that leads to the formation of a
pollutant. HC and NOx are precursors of photochemical
oxidants.
Preferred Model A refined model that is recommended for a specific type of
regulatory application.
Prevention of Significant Deterioration
(PSD) Area
A geographic area that contains air which is relatively clean
and not in violation of NAAQS. The emissions in these area
are regulated to prevent degradation of its air quality.
Primary Pollutant Chemical contaminants which are released directly to the
atmosphere by a source.
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Primary Standard A NAAQS set to protect human health.
Receptor A location at which ambient air quality is measured or
estimated.
Record of Decision (ROD) The decision document, prepared after the EIS, that states
what the decision is, identifies all alternative considered by
the lead agency in reaching its decision, and states whether
all practicable means to avoid or minimize environmental
harm have been adopted, and if not, why not.
Regionally Significant Under General Conformity Rule, when a Federal action’s
direct and indirect emissions exceed 10 percent of the total
emissions inventory for a particular criteria pollutant in an
nonattainment or maintenance area.
Scoping An early and open process (that invites the participation of
affected Federal, state and local agencies, any affected Indian
tribe, the proponent of the action and other interested
persons) that determines the issues to be addressed in an
environmental document and identifies relevant and/or
significant issues related to a proposed action.
Screening Technique A relatively simple analysis technique to determine if a given
source is likely to pose a threat to air quality. Concentration
estimates from screening techniques are conservative.
Secondary Pollutant Atmospheric contaminants formed in the atmosphere as a
result of such chemical reactions, as hydrolysis, oxidation
and photochemistry.
Secondary Standard A NAAQS set to protect human welfare.
Similar Actions Actions, when viewed with other reasonably foreseeable or
proposed actions, that have similarities that provide a basis
for evaluating their environmental consequences altogether
(in one document), such as common timing or geography.
Simple Terrain An area where terrain features are all lower in elevation than
the top of the stack of the source.
Simulation Model A mathematical description of a real physical and/or
chemical process. The responses of the model to input
parameter variations are analogous to those of the real
processes.
Smog A common term for ozone.
Stability A property of the atmosphere which determines the amount
of vertical mixing.
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State Historic Preservation
　
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