N.C. Department of Environment and Natural Resources
 Welcome to the North Carolina Division of Air Quality
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)



acetaldehyde (75-07-0) acetic acid (64-19-7) acrolein (107-02-8) acrylonitrile (107-13-1) ammonia (7664-41-7) aniline (62-53-3) arsenic and inorganic arsenic compounds asbestos (1332-21-4) aziridine (151-56-4) benzene (71-43-2) benzidine and salts (92-87-5) benzo(a)pyrene (50-32-8) benzyl chloride (100-44-7) beryllium (7440-41-7) beryllium chloride (7787-47-5) beryllium fluoride (7787-49-7) beryllium nitrate (13597-99-4) bioavailable chromate pigments, as chromium (VI) equivalent bis-chloromethyl ether (542-88-1) bromine (7726-95-6) 1,3-butadiene (106-99-0) cadmium (7440-43-9) cadmium acetate (543-90-8) cadmium bromide (7789-42-6) carbon disulfide (75-15-0) carbon tetrachloride (56-23-5) chlorine (7782-50-5) chlorobenzene (108-90-7) chloroform (67-66-3) chloroprene (126-99-8) cresol (1319-77-3) p-dichlorobenzene (106-46-7) dichlorodifluoromethane (75-71-8) dichlorofluoromethane (75-43-4) di(2-ethylhexyl)phthalate (117-81-7) dimethyl sulfate (77-78-1) 1,4-dioxane (123-91-1) epichlorohydrin (106-89-8)



0.03



1 1



1-hour (Acute Irritants) 27 3.7 0.08 2.7



2.1x10-6 2.8 x 10-6 fibers/ml 1.2 x 10-4 1.5 x 10-8 3.3 x 10-5 4.1 x 10-6 4.1 x 10-6 4.1 x 10-6 4.1 x 10-6 8.3 x 10-8 3.7 x 10-7 4.4 x 10-4 5.5 x 10-6 5.5 x 10-6 5.5 x 10-6 6.7 x 10-3



0.006



0.5



0.2



4.3 x 10-3



0.186 0.0375 2.2 0.44



0.9



3.5 2.2



66



248 0.5 0.03 0.003 0.56



8.3 x 10-2





Pollutant (CAS Number)



Annual (Carcinogens)



24-hour (Chronic Toxicants)



ethyl acetate (141-78-6) ethylenediamine (107-15-3) ethylene dibromide (106-93-4) ethylene dichloride (107-06-2) ethylene glycol monoethyl ether (110-80-5) ethylene oxide (75-21-8) ethyl mercaptan (75-08-1) fluorides formaldehyde (50-00-0) hexachlorocyclopentadiene (77-47-4) hexachlorodibenzo-p-dioxin (57653-85-7) n-hexane (110-54-3) hexane isomers except n-hexane hydrazine (302-01-2) hydrogen chloride (7647-01-0) hydrogen cyanide (74-90-8) hydrogen fluoride (7664-39-3) hydrogen sulfide (7783-06-4) maleic anhydride (108-31-6) manganese and compounds manganese cyclopentadienyl tricarbonyl (12079-65-1) manganese tetroxide (1317-35-7) mercury, alkyl mercury, aryl and inorganic compounds mercury, vapor (7439-97-6) methyl chloroform (71-55-6) methylene chloride (75-09-2) methyl ethyl ketone (78-93-3) methyl isobutyl ketone (108-10-1) methyl mercaptan (74-93-1) nickel carbonyl (13463-39-3) nickel metal (7440-02-0) nickel, soluble compounds, as nickel nickel subsulfide (12035-72-2) nitric acid (7697-37-2) nitrobenzene (98-95-3) n-nitrosodimethylamine (62-75-9) non-specific chromium (VI) compounds, as chromium (VI) equivalent pentachlorophenol (87-86-5) perchloroethylene (127-18-4) phenol (108-95-2) phosgene (75-44-5)



0.3



1-hour (Acute Systemic Toxicants) 140 2.5 1-hour (Acute Irritants)



4.0 x 10-4 3.8 x 10-3



0.12



2.7 x 10-5



0.016 0.0006



1.9 0.1 0.25 0.01



0.15



7.6 x 10-8



2.4 x 10-2



1.1 0.0006 0.14 0.03 0.12 0.012 0.031 0.0006 0.0062 0.00006 0.0006 0.0006 12 3.7 2.56 0.0006 0.006 0.0006



1.1



360 0.7 0.25



0.1



1.7



245 88.5 30



0.05



2.1 x 10-6



1



0.06 0.5



5.0 x 10-5 8.3 x 10-8



0.003



1.9 x 10-1



0.025 0.95



0.0025





Pollutant (CAS Number)



Annual (Carcinogens)



24-hour (Chronic Toxicants)



1-hour (Acute Systemic Toxicants)



phosphine (7803-51-2) polychlorinated biphenyls (1336-36-3) soluble chromate compounds, as chromium (VI) equivalent styrene (100-42-5) sulfuric acid (7664-93-9) tetrachlorodibenzo-p-dioxin (1746-01-6) 1,1,1,2-tetrachloro-2,2,difluoroethane (76-11-9) 1,1,2,2-tetrachloro-1,2difluoroethane (76-12-0) 1,1,2,2-tetrachloroethane (79-34-5) toluene (108-88-3) toluene diisocyanate, 2,4- (584-84-9) and 2,6- (91-08-7) isomers trichloroethylene (79-01-6) trichlorofluoromethane (75-69-4) 1,1,2-trichloro-1,2,2- trifluoroethane (76-13-1) vinyl chloride (75-01-4) vinylidene chloride (75-35-4) xylene (1330-20-7)



History Note:



1-hour (Acute Irritants) 0.13



8.3 x 10-5



6.2 x 10-4



0.012



10.6 0.1



3.0 x 10-9



52 52



6.3 x 10-3



4.7 0.0002 56



5.9 x 10-2



560



950



3.8 x 10-4



0.12 2.7



65



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.






Email us

Last Modified: Wed Jul 23 15:12:13 2014
 Visit the NCDENR web portal
Top of Page