AIR EMISSIONS REGULATIONS:

Air Quality Status	Serious nonattainment for ozone (The APCD is all of San Diego County) EPA's Nonattainment Areas
Major Source Threshold	50 tons of NOx or VOC triggers NSR
Minor Source Permitting Exemption	Less than 50 hp, 0.3 MW or 1 MMBtu/hr
Minor Source Treatment	BACT
Emergency Generating Limits	200 hours per year

DE MINIMIS EXEMPTIONS (Must meet 1298)

Engines less than 50 hp or turbines less than 0.3 MW or smaller than 1 MMBtu/hr are exempt from permitting.

MINOR SOURCE PERMITTING

New units must complete BACT for all criteria pollutants. The air district will basically follow CARB's recommended guidance, but may make stricter requirements depending on the outcome of a health risk assessment. Sample BACT for control of NOx from turbines and internal combustion engines is as follows:

Size of Unit	Level of Control (ppm)
>3 MW	9
3-12 MW simple cycle	2.5
3-12 MW combined cycle	5
12-50 MW simple cycle	2.5
12-50 MW combined cycle	5
IC Engines	9

The entire permitting process generally takes 3-4 months.

TREATMENT OF EMERGENCY ENGINES

Emergency engines must obtain a permit. CARB Air Toxic Control Measures for Stationary Compression Engines apply (see the CA state page for more information).