This guidance recommends using regional modeling domains. Regional modeling
applications require coordination, quality assurance and management of data bases covering
large areas of the country. Resources used to run recommended models for generating
meteorological and emissions inputs and the air quality model itself can be substantial.
States/Tribes facing the need to develop an attainment demonstration requiring resource
intensive techniques may wish to consider pooling resources in some manner. Examples might
include delegating responsibilities for certain parts of the analyses to a single State/Tribe which
can “specialize” in that kind of analysis. Another example might be formation of a regional
technical center to perform analyses as directed by its client group of States/Tribes (e.g., multistate
and tribal organizations such as the Regional Planning Organizations (RPO)10, LADCO,
and the Ozone Transport Commission (OTC)).
Premise 4. High concentrations of ozone, PM2.5 and regional haze often have a common
origin. Ozone formation and formation of secondary particulates result from several common
reactions and reactants. Secondary particulates are a major part of PM2.5. Often similar sources
contribute precursors to both ozone and PM2.5. In some regions of the U.S., high regional ozone
and secondary particulates are observed under common types of meteorological conditions.
Reducing PM2.5 is the principal controllable means for improving regional haze. Reducing PM2.5
precursors can also lead to reductions in ozone. Models intended to address secondary
particulate matter problems need also to be capable of simulating ozone formation and transport.
U.S. EPA policy is to encourage “integration” of programs to reduce ozone, PM2.5 and regional
haze to ensure they do not work at cross purposes and to foster maximum total air quality benefit
for lower costs.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD