15A N.C. Admin. Code 2D.1104
A facility shall not emit any of the following toxic air pollutants in such quantities that may cause or contribute beyond the facility's premises to any significant ambient air concentration that may adversely affect human health, except as allowed pursuant to 15A NCAC 02Q .0700. In determining these significant ambient air concentrations, the Division shall be governed by the following list of acceptable ambient levels in milligrams per cubic meter at 77° F (25° C) and 29.92 inches (760 mm) of mercury pressure, except for asbestos:
Acceptable Ambient Levels (AAL) in Milligrams per Cubic Meter (mg/m3) Except Where Noted | ||||
Pollutant (CAS Number) | Annual (Carcinogens) | 24-hour (Chronic Toxicants) | 1-hour (Acute Systemic Toxicants) | 1-hour (Acute Irritants) |
acetaldehyde (75-07-0) | 27 | |||
acetic acid (64-19-7) | 3.7 | |||
acrolein (107-02-8) | 0.08 | |||
acrylonitrile (107-13-1) | 0.03 | 1 | ||
ammonia (7664-41-7) | 2.7 | |||
aniline (62-53-3) | 1 | |||
arsenic and inorganic arsenic compounds | 2.1 x 10-6 | |||
asbestos (1332-21-4) | 2.8 x 10-6 fibers/ml | |||
aziridine (151-56-4) | 0.006 | |||
benzene (71-43-2) | 1.2 x 10-4 | |||
benzidine and salts (92-87-5) | 1.5 x 10-8 | |||
benzo(a)pyrene (50-32-8) | 3.3 x 10-5 | |||
benzyl chloride (100-44-7) | 0.5 | |||
beryllium (7440-41-7) | 4.1 x 10-6 | |||
beryllium chloride (7787-47-5) | 4.1 x 10-6 | |||
beryllium fluoride (7787-49-7) | 4.1 x 10-6 | |||
beryllium nitrate (13597-99-4) | 4.1 x 10-6 | |||
bioavailable chromate pigments, as chromium (VI) equivalent | 8.3 x 10-8 | |||
bis-chloromethyl ether (542-88-1) | 3.7 x 10-7 | |||
bromine (7726-95-6) | 0.2 | |||
1,3-butadiene (106-99-0) | 4.4 x 10-4 | |||
cadmium (7440-43-9) | 5.5 x 10-6 | |||
cadmium acetate (543-90-8) | 5.5 x 10-6 | |||
cadmium bromide (7789-42-6) | 5.5 x 10-6 | |||
carbon disulfide (75-15-0) | 0.186 | |||
carbon tetrachloride (56-23-5) | 6.7 x 10-3 | |||
chlorine (7782-50-5) | 0.0375 | 0.9 | ||
chlorobenzene (108-90-7) | 2.2 | |||
chloroform (67-66-3) | 4.3 x 10-3 | |||
chloroprene (126-99-8) | 0.44 | 3.5 | ||
cresol (1319-77-3) | 2.2 | |||
p-dichlorobenzene (106-46-7) | 66 | |||
di(2-ethylhexyl)phthalate (117-81-7) | 0.03 | |||
dimethyl sulfate (77-78-1) | 0.003 | |||
1,4-dioxane (123-91-1) | 0.56 | |||
epichlorohydrin (106-89-8) | 8.3 x 10-2 | |||
ethyl acetate (141-78-6) | 140 | |||
ethylenediamine (107-15-3) | 0.3 | 2.5 | ||
ethylene dibromide (106-93-4) | 4.0 x 10-4 | |||
ethylene dichloride (107-06-2) | 3.8 x 10-3 | |||
ethylene glycol monoethyl ether (110-80-5) | 0.12 | 1.9 | ||
ethylene oxide (75-21-8) | 2.7 x 10-5 | |||
ethyl mercaptan (75-08-1) | 0.1 | |||
fluorides | 0.016 | 0.25 | ||
formaldehyde (50-00-0) | 0.15 | |||
hexachlorocyclopentadiene (77-47-4) | 0.0006 | 0.01 | ||
hexachlorodibenzo-p-dioxin (57653-85-7) | 7.6 x 10-8 | |||
n-hexane (110-54-3) | 1.1 | |||
hexane isomers except n-hexane | 360 | |||
hydrazine (302-01-2) | 0.0006 | |||
hydrogen chloride (7647-01-0) | 0.7 | |||
hydrogen cyanide (74-90-8) | 0.14 | 1.1 | ||
hydrogen fluoride (7664-39-3) | 0.03 | 0.25 | ||
hydrogen sulfide (7783-06-4) | 0.12 | |||
maleic anhydride (108-31-6) | 0.012 | 0.1 | ||
manganese and compounds | 0.031 | |||
manganese cyclopentadienyl tricarbonyl (12079-65-1) | 0.0006 | |||
manganese tetroxide (1317-35-7) | 0.0062 | |||
mercury, alkyl | 0.00006 | |||
mercury, aryl and inorganic compounds | 0.0006 | |||
mercury, vapor (7439-97-6) | 0.0006 | |||
methyl bromide (74-83-9) | 0.005a | 1.0 | ||
methyl chloroform (71-55-6) | 12 | 245 | ||
methylene chloride (75-09-2) | 2.4 x 10-2 | 1.7 | ||
methyl ethyl ketone (78-93-3) | 3.7 | 88.5 | ||
methyl isobutyl ketone (108-10-1) | 2.56 | 30 | ||
methyl mercaptan (74-93-1) | 0.05 | |||
nickel carbonyl (13463-39-3) | 0.0006 | |||
nickel metal (7440-02-0) | 0.006 | |||
nickel, soluble compounds, as nickel | 0.0006 | |||
nickel subsulfide (12035-72-2) | 2.1 x 10-6 | |||
nitric acid (7697-37-2) | 1 | |||
nitrobenzene (98-95-3) | 0.06 | 0.5 | ||
n-nitrosodimethylamine (62-75-9) | 5.0 x 10-5 | |||
non-specific chromium (VI) compounds, as chromium (VI) equivalent | 8.3 x 10-8 | |||
pentachlorophenol (87-86-5) | 0.003 | 0.025 | ||
perchloroethylene (127-18-4) | 1.9 x 10-1 | |||
phenol (108-95-2) | 0.95 | |||
phosgene (75-44-5) | 0.0025 | |||
phosphine (7803-51-2) | 0.13 | |||
polychlorinated biphenyls (1336-36-3) | 8.3 x 10-5 | |||
soluble chromate compounds, as chromium (VI) equivalent | 6.2 x 10-4 | |||
styrene (100-42-5) | 10.6 | |||
sulfuric acid (7664-93-9) | 0.012 | 0.1 | ||
tetrachlorodibenzo-p-dioxin (1746-01-6) | 3.0 x 10-9 | |||
1,1,2,2-tetrachloroethane (79-34-5) | 6.3 x 10-3 | |||
toluene (108-88-3) | 4.7 | 56 | ||
toluene diisocyanate, 2,4- (584-84-9) and 2,6- (91-08-7) isomers | 0.0002 | |||
trichloroethylene (79-01-6) | 5.9 x 10-2 | |||
vinyl chloride (75-01-4) | 3.8 x 10-4 | |||
vinylidene chloride (75-35-4) | 0.12 | |||
xylene (1330-20-7) | 2.7 | 65 | ||
a This compound has not been defined as a carcinogen.
15A N.C. Admin. Code 02D .1104
Eff. May 1, 1990;
Amended Eff. September 1, 1992; March 1, 1992;
Temporary Amendment Eff. July 20, 1997;
Amended Eff. July 7, 2014; May 1, 2014; March 1, 2010; June 1, 2008; April 1, 2005; April 1, 2001; July 1, 1998;
Readopted Eff. July 1, 2018;
Amended Eff. November 1, 2020.
Eff. 5/1/1990;
Amended Eff. 9/1/1992; March 1, 1992;
Temporary Amendment Eff. 7/20/1997;
Amended Eff. 7/7/2014; March 1, 2010; June 1, 2008; April 1, 2005; April 1, 2001; July 1, 1998;