15A NCAC 02D .1104. TOXIC AIR POLLUTANT GUIDELINES

A facility shall not emit any of the following toxic air pollutants in such quantities that may cause or contribute beyond the premises (adjacent property boundary) to any significant ambient air concentration that may adversely affect human health. In determining these significant ambient air concentrations, the Division shall be guided 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):

 

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
dichlorodifluoromethane   (75-71-8)		248
dichlorofluoromethane  (75-43-4)		0.5
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 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
1,1,1,2-tetrachloro-2,2,- difluoroethane (76-11-9)		52
1,1,2,2-tetrachloro-1,2- difluoroethane (76-12-0)		52
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
trichlorofluoromethane  (75-69-4)			560
1,1,2-trichloro-1,2,2- trifluoroethane (76-13-1)				950
vinyl chloride (75-01-4)	3.8 x 10-4
vinylidene chloride (75-35-4)		0.12
xylene (1330-20-7)		2.7		65

 

History Note:        Authority G.S. 143-215.3(a)(1); 143-215.107(a)(3),(4),(5); 143B-282;

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.