Page 1 of 1

CA Nonattainment Areas; Fine Particulate Matter Emissions

PostPosted: Fri Mar 14, 2014 8:06 pm
by Wilberforce
PDF
Approval and Promulgation of Implementation Plans; California San Francisco Bay Area and Chico Nonattainment Areas; Fine Particulate Matter Emissions Inventories
https://www.federalregister.gov/article ... -and-chico

As noted above, high PM2.5 concentrations in the San
Francisco Bay Area nonattainment area occur primarily during the
winter months and, therefore, the BAAQMD submitted a winter
season inventory. The high winter concentrations are mainly due
to meteorological factors, but also are affected by increased
residential wood burning during the winter. In addition, cool
weather promotes the formation of ammonium nitrate. Residential
wood burning and diesel vehicles comprise about two thirds of
the directly emitted PM2.5 emissions. On-road motor vehicles make
up the largest source of NOx and VOC emissions.

Residential wood heating accounts for almost half of the winter
directly emitted PM2.5 emissions, and mobile sources are the
largest contributors to NOx emissions.