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Source: Adapted from David R. Patrick, ed, 1994, Toxic air pollution handbook (New York: Van Nostrand Reinhold). aCEM = continuous emission monitor.

bBefore opening equipment, VC must be reduced to 2.0 percent (volume) or 25 gallons, whichever is larger.

cMg/year = megagrams per year.

dmg/dscm = milligrams per dry standard cubic meter.

eLDAR = leak detection and repair.

fNDE = no detectable emissions.

gTSDF = treatment, storage, and disposal facilities.

hmrem/year = millirems per year (the rem is the unit of effective dose equivalent for radiation exposure). ipCi/m2 per second = picocuries per square meter per second.

Source: Adapted from David R. Patrick, ed, 1994, Toxic air pollution handbook (New York: Van Nostrand Reinhold). aCEM = continuous emission monitor.

bBefore opening equipment, VC must be reduced to 2.0 percent (volume) or 25 gallons, whichever is larger.

cMg/year = megagrams per year.

dmg/dscm = milligrams per dry standard cubic meter.

eLDAR = leak detection and repair.

fNDE = no detectable emissions.

gTSDF = treatment, storage, and disposal facilities.

hmrem/year = millirems per year (the rem is the unit of effective dose equivalent for radiation exposure). ipCi/m2 per second = picocuries per square meter per second.

are developed to control hazardous air pollutant emissions from both new and existing sources.

The 1990 amendments establish priorities for promulgating standards. The EPA, in prioritizing its efforts, is to consider the following:

The known or anticipated adverse effects of pollutants on public health and the environment The quality and location of emissions or anticipated emissions of hazardous air pollutants that each category or subcategory emits The efficiency of grouping categories or subcategories according to the pollutants emitted or the processes or technologies used

The EPA is to promulgate standards as expeditiously as practicable, but the 1990 amendments also established a minimum number of sources that must be regulated pursuant to a schedule. At this writing, standards for forty categories and subcategories are to be promulgated. The following standards are among those that have been promulgated:

On September 22, 1993, the EPA issued national emission standards for perchloroethylene (PCE) dry cleaning facilities

On October 27, 1993, coke oven battery standards were promulgated

On April 22, 1994, the EPA announced its final decisions on the hazardous organic NESHAP rule (HON), which requires sources to achieve emission limits reflecting the application of the MACT

By November 15, 1994, emission standards for 25 percent of the listed categories and subcategories were promulgated. Another 25 percent must be promulgated by November 15, 1997. All emission standards must be promulgated by November 15, 2000. Generally, existing sources must meet promulgated standards as expeditiously as practicable, but no later than three years after promulgation.

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