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Contact Information:
Bay Area AQMD
939 Ellis Street
San Francisco, CA 94109-7799
(415) 771-6000
Or view the Department's
Website
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Bay Area Air Quality Management District-CALIFORNIA
| Air Quality Status |
Moderate nonattainment for PM and ozone (AQMD includes Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara,
western portion of Solano and the southern portion of Sonoma counties
EPA's Nonattainment Areas |
| Major Source Threshold |
100 tons of NOx, VOCs or PM triggers NSR. 250 tons of any other criteria pollutant triggers PSD |
| Minor Source Permitting Exemption |
Based on size, emissions and type |
| Minor Source Treatment |
BACT, opacity, SO2, NOx and CO limits |
| Emergency Generating Limits |
BACT |
DE MINIMIS EXEMPTIONS (Must Meet 1298):
In general engines less than 50 hp are exempt, however there are several conditions that apply. A detailed flow
chart is available on page 2-1-33 of Regulation 2 Rule 1 and may be accessed using the link above.
MINOR SOURCE PERMITTING:
Sources with potential emissions of 10 pounds per day of any criteria pollutant are subject to BACT. The air district
uses its own BACT workbook
to determine levels of control.
Sources that do not trigger BACT must still meet limitations for SO2, NOx, CO and opacity. Opacity is limited
to 20%, SO2 emissions cannot exceed 300 ppm and CO emissions are limited to 2,000 ppm. NOx limits are as follows:
| Technology |
Size |
Limit |
| Gas Turbines |
0.3-10 MW |
**42 ppm
**If firing gas 55 ppm
**For non-gaseous fuel firing during natural gas curtailment or short periods 65 ppm
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10 MW and over without SCR |
**15 ppm
**For non-gaseous fuel firing during natural gas curtailment or short testing periods 42 ppm
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10 MW and over with SCR |
**9 ppm
**For non-gaseous fuel firing during natural gas curtailment or short testing periods 25 ppm
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| Internal Combustion Engines |
Rich-burn |
56 ppm |
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Lean-burn |
140 ppm |
Sources with potential emissions less than 25 pounds per day of all criteria pollutants may receive limits based
on the permitting official's discretion.
The permitting process can take up to 180 days. A public comment period of 30 days is required.
TREATMENT OF EMERGENCY ENGINES:
Emergency engines must obtain a permit, install run hour meters to measure usage, and will be required to log usage.
All new engines will be subject to BACT. Operators of these units must also choose between Emergency Standby status,
and typical permitting.
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