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a. a 30-day notice of the action and the draft determination provided to the
appropriate EPA region and State and local air control agencies,
b. the draft determination made available to the public to allow opportunity for
review and comment,
c. the draft determination made public by placing a notice by prominent
advertisement in a daily newspaper of general circulation in the area affected
by the proposed project, and
d. a 30-day public comment period provided prior to taking any formal action
on the draft determination?
24. If it is a final conformity determination, was it made public within 30 days of the
final determination by placing a notice, by prominent advertisement, in a daily
newspaper of general circulation in the area affected by the action?
B1.5 NAAQS Analysis
25. Does the airport emissions inventory with the proposed project (proposed project
emissions minus no project emissions) exceed the passenger/activity threshold
established to indicate a need for National Ambient Air Quality Standard
(NAAQS) review? If yes, continue to item 25. If no, no further action is
required.
26. Are emissions reasonably foreseeable? If yes, continue to item 26. If no, no
further action is required.
27. For proposed build action, was dispersion modeling performed on all applicable
airport emissions (direct and indirect, including construction) to calculate a
resulting pollutant concentration at appropriate receptor sites?
28. Were appropriate background pollutant concentrations included in the analysis?
29. Do airport pollutant concentrations, when combined with the background
pollutant concentration, exceed NAAQS or any state or local standard? If yes,
continue to item 29. If no, finalize analysis, document, and coordinate with
state/local agencies and EPA.
30. Can emissions be mitigated or offset or the project redesigned to reduce direct or
indirect emissions (including temporary emissions such as construction
emissions) such that the combined airport and background pollutant
concentrations are below the NAAQS or any state or local standard? If yes,
finalize analysis, document and coordinate with state/local agencies and EPA. If
no, the project must be redefined and reevaluated such that it does not exceed
NAAQS or any state or local standard.
B-8
Appendix C: Key Pollutants
C-2
C-3
Appendix C: Key Pollutants
CONTENTS
C1 Summary ___________________________________________________________5
C1.1 Ozone (O3)_____________________________________________________________ 6
C1.2 Carbon Monoxide (CO) __________________________________________________ 7
C1.3 Particulates (PM-10) ____________________________________________________ 7
C1.4 Sulfur Dioxide (SO2)_____________________________________________________ 8
C1.5 Nitrogen Dioxide (NO2) __________________________________________________ 8
C1.6 Lead (Pb)______________________________________________________________ 8
LIST OF TABLES
Table C-1: National Ambient Air Quality Standards (NAAQS) ___________________________________6
C-4
C-5
Appendix C: Key Pollutants
C1 Summary
The EPA has identified six pollutants, termed "criteria pollutants," that cause or contribute to air
pollution and could endanger the public health or welfare. These pollutants are addressed by the
key statutes and regulations identified above, including the National Environmental Policy Act of
1969 (NEPA) (Reference 30), Council on Environmental Quality regulations (Reference 9), the
Clean Air Act (CAA) as amended (Reference 5), and the General Conformity Rule (Reference 7).
The six criteria pollutants are:
·  Ozone (O3),
·  Carbon monoxide (CO),
·  Particulates (PM-10),
·  Sulfur dioxide (SO2),
·  Nitrogen dioxide (NO2), and
·  Lead (Pb).
The EPA established numerical air quality standards under the CAA for these criteria pollutants
that are to be applied uniformly throughout the U.S. These standards are termed the National
Ambient Air Quality Standards (NAAQS). A region's air quality is determined by comparing
ambient air pollution levels with the appropriate NAAQS for each criteria pollutant. An area, or
air quality control region, that violates the NAAQS for a particular pollutant anywhere within the
region is designated as being in "nonattainment" for that pollutant (e.g., an area may be
designated as nonattainment for ozone and carbon monoxide). Most major urban areas with
heavy industrialization have levels of certain pollutants that exceed the NAAQS. The NAAQS
for ozone is most commonly exceeded; roughly 100 areas are designated as nonattainment for
　
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