Definitions of a Source’s Size Category

Emissions specified here are controlled emissions. The emissions resulting from the application of best available control technology (BACT) or lowest achievable emission rate (LAER).

Major Source

A general Definition. A source with potential to emit at least 100 tons per year of any pollutant. See Utah Air Quality Rule, R307-101-2 for precise definition.

Major Modifications

Significant emission increases with a major on minor source equal or larger than the values given below. See Utah Air Quality Rule, R307-101-2 for precise definition.

Pollutant Tons per Year
PM10 15
SO2, NOx, VOC 40
CO 100
Lead 0.6
Asbestos 0.007
Beryllium 0.0004
Mercury 0.1
Vinyl Chloride 1
Fluorides 3
Sulfuric Acid Mist 7
Total Reduced Sulfur 10

Major PSD Source

A source emitting, in an attainment area, 250 tons per year or larger of any pollutant. Also any one of 27 source categories that emits in an attainment area at least 100 tons per year. See Utah Air Quality Rule, R307-405 for complete definitions and a list of the 27 categories.

Minor Source

A source that has emission less than a major source. See Utah Air Quality Rule, R307-101-2 for precise definition.

Minor Modification

Emissions less than a major modification.

Questions

Originally posted: May 7, 2018 at 7:21 am
Last updated: May 7, 2018 at 9:00 am
Categories: Air Quality, Permits