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Glossary of Terms

Potential to Emit (PTE):

A unit's potential to emit is the maximum possible emissions that could be generated by that unit if it were to operate 8,760 hour per year (at maximum capacity).

Best Available Control Technology (BACT):

This level of control is required when a source triggers Prevention of Significant Deterioration (PSD). It requires a top-down cost analysis of possible control technologies. States make a case-by-case determination of what controls will be required for a new unit based on consideration of both cost and effectiveness.

Lowest Achievable Emission Rate (LAER):

This level of control is required when a source triggers NSR. It requires application of the most stringent control equipment that has been demonstrated for a similar technology regardless of cost.

Significant:

A source that triggers Title V is considered to emit at a significant level.

Major:

A source that triggers PSD/NSR is considered major.

Criteria Pollutants:

6 pollutants that EPA monitors to determine if a region is meeting National Ambient Air Quality Standards. Ambient concentrations of these pollutant that exceed EPA's allowable limits will lead to the area being designated as "nonattainment." The 6 criteria pollutants are: sulfur dioxide (SO2), particulate matter (PM), carbon monoxide (CO), ozone (measured by precursor pollutants-nitrogen oxides (NOx) and volatile organic compounds (VOCs), nitrogen dioxide (NO2) and lead.

Nonattainment/Attainment:

An area is said to be in attainment or nonattainment depending on whether it meets EPA's ambient air standards for concentrations of the 6 criteria pollutants. If concentrations of a pollutant exceed EPA's standards the area is said to be in nonattainment for the given pollutant.

Federal New Source Review:

This is the program that requires preconstruction permitting, either NSR or PSD and requires application of either BACT or LAER for major sources.

NSR/PSD:

NSR stands for new source review, but actually represents a certain course of action within the federal New Source Review program for permitting of sources in a nonattainment area. Sources that trigger NSR must apply Lowest Achievable Emissions Reduction. In attainment areas the course of action used is PSD, which stands for prevention of significant deterioration. PSD requires Best Available Control Technology.