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Air Quality Fact

When the weather is warm and stagnant, high concentrations of ozone can form. Ground level ozone irritates the lungs and is unhealthy to breathe, especially for people with repiratory problems, children, the elderly, and anyone who exercises outdoors.

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Wood Burning Status

Friday, 2/3
No Spare the Air Alert in Effect
Saturday, 2/4
No Spare the Air Alert in Effect
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Air Quality Widgets | BAAQMD

BAAQMD Webcasts

Upcoming Webcasts

Particulate Matter Workshop to be Webcast live from 1:30pm to 4:00pm on 2/6/2012.
More Information:
Particulate Matter Planning

Workshop on Proposed Amendments to Regulation 2: Permits to be Webcast live from 10:00am to 12:00pm on 2/22/2012.
More Information:
Rule Workshops

Recent Webcasts

12/14/2011 Board of Directors Special Meeting
More Information:
12/14/2011 Agenda
(545 k PDF, 23 pgs)
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Contacts

Individuals

  • Glen Long
  • Supervising Air Quality Engineer, Engineering
  • 415 749-4659
  • Jane Lundquist
  • Principal Air Quality Engineer, Engineering
  • 415 749-4675

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Engineering

415 749-4990

Engineering Contacts
Full BAAQMD Directory

Air Dispersion Modeling: Air Toxics/PSD

Air dispersion modeling may be required for some projects in order to demonstrate compliance with applicable requirements. These projects include those subject to “New Source Review of Toxic Air Contaminants” (BAAQMD Regulation 2-5), the California Air Toxics “Hot Spots” Program (AB2588), and Prevention of Significant Deterioration “PSD” BAAQMD Regulation 2-2-304, 40 CFR 51.116). The intent of the modeling analysis is to demonstrate that emissions from a given facility or project do not or will not adversely impact the maintenance of air quality standards in the BAAQMD; be it acceptable levels of toxic air contaminants (TAC), the California or National Ambient Air Quality Standards (AAQS), or applicable PSD increments.

For permit applications involving air toxics, modeling may be required as part of a health risk screening analysis (HRSA). In most cases this modeling is performed by the BAAQMD with input from the applicant. For projects where the applicant is responsible for modeling, in particular for a PSD analysis, the BAAQMD Permit Modeling Guidance  (90 k PDF, 10 pgs)document should be followed. This document has been prepared by the Engineering Division of the BAAQMD to give the permit applicant specific assumptions, requirements, conventions, and procedures for the preparation of a modeling analysis. Because this guidance cannot cover every aspect of the analysis needed for a proposed source without becoming unwieldy the applicant should submit a modeling plan (protocol) for BAAQMD comment before beginning the analysis.

BAAQMD Modeling Support Documents
EPA Modeling Guidance

Last Updated: 10/4/2010