EPA non-attainment areas are constantly under pressure to meet the Clean Air Standards of 1990. While a number of non-attainment areas exist throughout the country, California has been dealing with this issue for decades. As cost-effective combustion solutions have been developed, that state’s Air Resource Boards have responded accordingly by lowering the NOX emissions on industrial and commercial stationary sources.
The most recent round of emission reductions focused on units with heat inputs of 2 million BTU/hr or more. Two California air-pollution agencies — the South Coast Air Quality Management District (SCAQMD) and the San Joaquin Valley Air Pollution Control District (SJVAPCD) — mandated that NOX emissions on gas-fired stationary sources not exceed 9 ppm corrected to 3 percent excess oxygen.