AIR EMISSIONS REGULATIONS:

Air Quality Status	Nonattainment for ozone, PM (The AQMD is all of Los Angeles County except for Antelope Valley AQMD, Orange County, western portion of San Bernardino and western portion of Riverside counties) EPA's Nonattainment Areas
Major Source Threshold	Major source thresholds for criteria pollutants often vary in the three air basins – South Coast Air Basin, Riverside County Portion of Salton Sea Air Basin, and the Riverside County Portion of the Mojave Desert Air Basin. Major source limits for– NOx and VOCs vary from 10 tpy to 100; SO2 all basins 100 tpy; CO 50 to 100 tpy; and PM10 70 to 100 tpy.
Minor Source Permitting Exemption	Size based
Minor Source Treatment	BACT
Emergency Generating Limits	200 hours per year

DE MINIMIS EXEMPTIONS (Must meet 1298)

Any internal combustion engines (ICE) greater than 50 bhp or turbines less than 2,975,000 Btu/hr are exempt from permit requirements, unless they are operated on landfill gas.

MINOR SOURCE PERMITTING

All units with a potential to emit greater than 25 pounds per day of a criteria pollutant will be required to apply district BACT. The air district follows CARB's guidance for permitting of electric generating technologies (except where source specific standards apply). BACT guidelines can be found here.

Source specific standards, Rule 1110.2, applies for emissions from gaseous- and liquid-fueled engines over 50 bhp. Limits for new engines are as follows:

All new non-emergency engines driving electrical generators must comply with the following emission standards –

Pollutant	Emission Standard ( lbs/MWh)
NOx	0.070
CO	0.20
VOC	0.10

Cost effectiveness values for minor source BACT (from third quarter 2003):

Pollutant	Average (Maximum $ per Ton)	Incremental (Maximum $ per Ton)
Reactive Organic Compounds (ROG)	20,200	60,600
NOx	19,100	57,200
SOx	10,100	30,300
PM 10	4,500	13,400
CO	400	1,150

Permitting generally takes 60-90 days, but can take 120 days or more if a public comment period is required.

TREATMENT OF EMERGENCY ENGINES

Emergency engines must meet certain permit conditions that limit hours of operation to 200 hours a year to avoid the emission limits outlined above. A standby ICE or turbine for non-utility power generation that is only operated in the event of an emergency power failure or for routine testing or maintenance is considered to be an emergency generator. Additionally, ICE’s for emergency power generation that are permitted by the AQMD can only operate during State II of Stage III electrical emergencies declared by the ISO during actual or imminent blackouts. More information on emergency generator operating and other limits can be found here.