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California and the federal governments have
established ambient air quality standards for fine particulate matter (PM)
less than or equal to 2.5 microns in diameter (PM 2.5). As a result,
there was a need to establish a methodology for calculating PM 2.5 and
appropriate PM 2.5 significance thresholds for the purpose of analyzing
local and regional PM 2.5 air quality impacts in CEQA or NEPA air quality
analyses. A Working Group was established, which included
representatives from various stakeholder groups, to provide input in the
development of PM 2.5 significance thresholds and calculation methodology.
On October 6, 2006, the SCAQMD Governing Board unanimously adopted the
following methodology to calculate PM2.5 and PM2.5 significance
thresholds. As part of AQMD intergovernmental review (IGR)
commenting responsibilities, begin submitting comments relative to the
PM2.5 proposal on CEQA documents beginning January 2007.
Final Documents
Past Meeting Information
Public Hearing for Governing Board to Consider Implementing
Methodology to Calculate PM2.5 and PM2.5 Significance Thresholds - October
6, 2006
Governing Board Public Hearing
Agenda Item #36
PM 2.5 Working Group Meeting #3 - August 22, 2006
Agenda (908 KB, doc file)
PM 2.5 Public Workshop - August 9, 2006
PM 2.5 Working Group Meeting #2 - July 11, 2006
Agenda (907 KB, doc
file)
PM 2.5 Working Group
Meeting #1 - June 8, 2006
Agenda (906 KB, doc
file)
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