Substance list by threshold

The National Pollutant Release Inventory (NPRI) tracks the release of substances to the environment, including their disposal or their transfer for recycling. This information is collected and published because they may pose a risk to the environment or to health.

The substances listed on the NPRI are organized into five parts, each having different reporting requirements. Detailed explanations can be found in the Guide for reporting to the NPRI.

Part 1A	Commonly referred to as “core substances”, this group makes up the majority of substances on the NPRI list and most have been on it since the start of the NPRI.
Part 1B	These substances are referred to as “alternate threshold substances” and have a lower reporting threshold than Part 1A substances. They may have significant environmental or human health impacts in small amounts.
Part 2	These substances are polycyclic aromatic hydrocarbons (PAHs) that may be used as commercial chemicals, incidentally manufactured in certain industrial processes, or contained in tailings.
Part 3	These substances are polychlorinated dibenzo-p-dioxins (dioxins), polychlorinated dibenzofurans (furans) and hexachlorobenzene that are released as by-products of industrial and combustion processes. They can be found as contaminants in pesticides, solvents or wood preservatives.
Part 4	These substances are known as criteria air contaminants (CACs), commonly released from combustion sources that can cause or contribute to air issues such as smog and acid rain.
Part 5	These substances are volatile organic compounds (VOCs) also known as “speciated VOCs” which are subject to additional reporting requirements. They are listed on the NPRI in three groups: individual substances isomer groups other groups and mixtures

Before using the NPRI substance list

The Canada Gazette notice with respect to substances in the National Pollutant Release Inventory includes the official list of NPRI substances. The substance list is also available in Excel format for download.

MPO	"Manufactured, processed or otherwise used" refers to the amount of the substance produced, prepared or used in any other way at a facility.
PAH	Polycyclic aromatic hydrocarbons may be used as commercial chemicals, incidentally manufactured in certain industrial processes, or contained in tailings.
VOC	Volatile organic compounds are substances that contribute to air pollution. They appear in each part of the NPRI substance list and have varying reporting requirements.
CAS RN	Chemical abstract service registry number is the property of the American Chemical Society. Note: Any use or redistribution is not permitted without the prior, written permission of the American Chemical Society except as required in supporting regulatory requirements and/or for reports to the government when the information and the reports are required by law or administrative policy.
NA - ##	Other substance identifiers used where no single CAS RN applies to a substance.

Further information and definitions are available in our Glossary of terms.

Visit the History of reporting requirements page for more information on how the NPRI substance list has changed since the start of the program.

For substance lists for other years, please contact the NPRI.

2018 to 2019 NPRI substance list

Substance name	CAS RN or other substance identifier	Part # (threshold category)	Reporting threshold	Substance category
Acetaldehyde	75-07-0	1A	10 tonnes MPO	VOC
Acetonitrile	75-05-8	1A	10 tonnes MPO	VOC
Acetophenone	98-86-2	1A	10 tonnes MPO	VOC
Acrolein	107-02-8	1A	10 tonnes MPO	VOC
Acrylamide	79-06-1	1A	10 tonnes MPO	VOC
Acrylic acid (and its salts)^{Footnote 1}	79-10-7	1A	10 tonnes MPO	VOC
Allyl alcohol	107-18-6	1A	10 tonnes MPO	VOC
Aluminum (fume or dust only)	7429-90-5	1A	10 tonnes MPO	N/A
Aluminum oxide (fibrous forms only)	1344-28-1	1A	10 tonnes MPO	N/A
Ammonia (total)^{Footnote 2}	NA - 16	1A	10 tonnes MPO	N/A
Aniline (and its salts)^{Footnote 1}	62-53-3	1A	10 tonnes MPO	VOC
Antimony (and its compounds)^{Footnote 3}	NA - 01	1A	10 tonnes MPO	N/A
Asbestos (friable form only)	1332-21-4	1A	10 tonnes MPO	N/A
Benzene	71-43-2	1A	10 tonnes MPO	VOC
Benzoyl chloride	98-88-4	1A	10 tonnes MPO	N/A
Benzoyl peroxide	94-36-0	1A	10 tonnes MPO	N/A
Benzyl chloride	100-44-7	1A	10 tonnes MPO	VOC
Biphenyl	92-52-4	1A	10 tonnes MPO	VOC
Bis (2-ethylhexyl) adipate	103-23-1	1A	10 tonnes MPO	N/A
Bis (2-ethylhexyl) phthalate	117-81-7	1A	10 tonnes MPO	N/A
Boron trifluoride	7637-07-2	1A	10 tonnes MPO	N/A
Bromine	7726-95-6	1A	10 tonnes MPO	N/A
Bromomethane	74-83-9	1A	10 tonnes MPO	VOC
1,3-Butadiene	106-99-0	1A	10 tonnes MPO	VOC
2-Butoxyethanol	111-76-2	1A	10 tonnes MPO	VOC
Butyl acrylate	141-32-2	1A	10 tonnes MPO	VOC
sec-Butyl alcohol	78-92-2	1A	10 tonnes MPO	VOC
i-Butyl alcohol	78-83-1	1A	10 tonnes MPO	VOC
n-Butyl alcohol	71-36-3	1A	10 tonnes MPO	VOC
tert-Butyl alcohol	75-65-0	1A	10 tonnes MPO	VOC
Butyl benzyl phthalate	85-68-7	1A	10 tonnes MPO	VOC
1,2-Butylene oxide	106-88-7	1A	10 tonnes MPO	VOC
Butyraldehyde	123-72-8	1A	10 tonnes MPO	VOC
C.I. Basic Green 4	569-64-2	1A	10 tonnes MPO	N/A
C.I. Disperse Yellow 3	2832-40-8	1A	10 tonnes MPO	N/A
Calcium fluoride	7789-75-5	1A	10 tonnes MPO	N/A
Carbon disulphide	75-15-0	1A	10 tonnes MPO	VOC
Carbon tetrachloride	56-23-5	1A	10 tonnes MPO	VOC
Carbonyl sulphide	463-58-1	1A	10 tonnes MPO	VOC
Catechol	120-80-9	1A	10 tonnes MPO	N/A
CFC-11	75-69-4	1A	10 tonnes MPO	N/A
CFC-114	76-14-2	1A	10 tonnes MPO	N/A
CFC-115	76-15-3	1A	10 tonnes MPO	N/A
CFC-12	75-71-8	1A	10 tonnes MPO	N/A
CFC-13	75-72-9	1A	10 tonnes MPO	VOC
Chlorine	7782-50-5	1A	10 tonnes MPO	N/A
Chlorine dioxide	10049-04-4	1A	10 tonnes MPO	N/A
Chloroacetic acid (and its salts)^{Footnote 1}	79-11-8	1A	10 tonnes MPO	N/A
Chlorobenzene	108-90-7	1A	10 tonnes MPO	VOC
Chloroethane	75-00-3	1A	10 tonnes MPO	VOC
Chloroform	67-66-3	1A	10 tonnes MPO	VOC
Chloromethane	74-87-3	1A	10 tonnes MPO	VOC
Chromium (and its compounds)^{Footnote 4}	NA - 04	1A	10 tonnes MPO	N/A
Copper (and its compounds)^{Footnote 3}	NA - 06	1A	10 tonnes MPO	N/A
Cresol (all isomers, and their salts)^{Footnote 1}^{Footnote 5}	1319-77-3	1A	10 tonnes MPO	VOC
Cumene	98-82-8	1A	10 tonnes MPO	VOC
Cumene hydroperoxide	80-15-9	1A	10 tonnes MPO	N/A
Cyanides (ionic)	NA - 07	1A	10 tonnes MPO	N/A
Cyclohexane	110-82-7	1A	10 tonnes MPO	VOC
Cyclohexanol	108-93-0	1A	10 tonnes MPO	VOC
Decabromodiphenyl oxide	1163-19-5	1A	10 tonnes MPO	N/A
Di- n -octyl phthalate	117-84-0	1A	10 tonnes MPO	N/A
2,6-Di- t-butyl-4-methylphenol	128-37-0	1A	10 tonnes MPO	N/A
Dibutyl phthalate	84-74-2	1A	10 tonnes MPO	VOC
p-Dichlorobenzene	106-46-7	1A	10 tonnes MPO	VOC
o-Dichlorobenzene	95-50-1	1A	10 tonnes MPO	VOC
3,3'-Dichlorobenzidine dihydrochloride	612-83-9	1A	10 tonnes MPO	N/A
1,2-Dichloroethane	107-06-2	1A	10 tonnes MPO	VOC
Dichloromethane	75-09-2	1A	10 tonnes MPO	N/A
2,4-Dichlorophenol (and its salts)^{Footnote 1}	120-83-2	1A	10 tonnes MPO	N/A
1,2-Dichloropropane	78-87-5	1A	10 tonnes MPO	VOC
Dicyclopentadiene	77-73-6	1A	10 tonnes MPO	VOC
Diethanolamine (and its salts)^{Footnote 1}	111-42-2	1A	10 tonnes MPO	N/A
Diethyl phthalate	84-66-2	1A	10 tonnes MPO	N/A
Diethyl sulphate	64-67-5	1A	10 tonnes MPO	N/A
Dimethyl phthalate	131-11-3	1A	10 tonnes MPO	VOC
Dimethyl sulphate	77-78-1	1A	10 tonnes MPO	N/A
Dimethylamine	124-40-3	1A	10 tonnes MPO	VOC
N,N-Dimethylaniline (and its salts)^{Footnote 1}	121-69-7	1A	10 tonnes MPO	N/A
N,N-Dimethylformamide	68-12-2	1A	10 tonnes MPO	VOC
4,6-Dinitro- o -cresol (and its salts)^{Footnote 1}	534-52-1	1A	10 tonnes MPO	N/A
2,4-Dinitrotoluene	121-14-2	1A	10 tonnes MPO	N/A
1,4-Dioxane	123-91-1	1A	10 tonnes MPO	VOC
Diphenylamine	122-39-4	1A	10 tonnes MPO	VOC
Epichlorohydrin	106-89-8	1A	10 tonnes MPO	VOC
2Ethoxyethanol	110-80-5	1A	10 tonnes MPO	VOC
2-Ethoxyethyl acetate	111-15-9	1A	10 tonnes MPO	VOC
Ethyl acrylate	140-88-5	1A	10 tonnes MPO	VOC
Ethylbenzene	100-41-4	1A	10 tonnes MPO	VOC
Ethylene	74-85-1	1A	10 tonnes MPO	VOC
Ethylene glycol	107-21-1	1A	10 tonnes MPO	VOC
Ethylene oxide	75-21-8	1A	10 tonnes MPO	VOC
Ethylene thiourea	96-45-7	1A	10 tonnes MPO	N/A
Fluorine	7782-41-4	1A	10 tonnes MPO	N/A
Formaldehyde	50-00-0	1A	10 tonnes MPO	VOC
Formic acid	64-18-6	1A	10 tonnes MPO	VOC
Halon 1211	353-59-3	1A	10 tonnes MPO	N/A
Halon 1301	75-63-8	1A	10 tonnes MPO	N/A
HCFC-122 (all isomers)^{Footnote 6}	41834-16-6	1A	10 tonnes MPO	N/A
HCFC-123 (all isomers)^{Footnote 7}	34077-87-7	1A	10 tonnes MPO	N/A
HCFC-124 (all isomers)^{Footnote 8}	63938-10-3	1A	10 tonnes MPO	N/A
HCFC-141b	1717-00-6	1A	10 tonnes MPO	N/A
HCFC-142b	75-68-3	1A	10 tonnes MPO	N/A
HCFC-22	75-45-6	1A	10 tonnes MPO	N/A
Hexachlorocyclopentadiene	77-47-4	1A	10 tonnes MPO	N/A
Hexachlorophene	70-30-4	1A	10 tonnes MPO	N/A
n-Hexane	110-54-3	1A	10 tonnes MPO	VOC
Hydrochloric acid	7647-01-0	1A	10 tonnes MPO	N/A
Hydrogen cyanide	74-90-8	1A	10 tonnes MPO	N/A
Hydrogen fluoride	7664-39-3	1A	10 tonnes MPO	N/A
Hydrogen sulphide	7783-06-4	1A	10 tonnes MPO	N/A
Hydroquinone (and its salts)^{Footnote 1}	123-31-9	1A	10 tonnes MPO	N/A
Iron pentacarbonyl	13463-40-6	1A	10 tonnes MPO	N/A
Isobutyraldehyde	78-84-2	1A	10 tonnes MPO	VOC
Isophorone diisocyanate	4098-71-9	1A	10 tonnes MPO	N/A
Isopropyl alcohol	67-63-0	1A	10 tonnes MPO	VOC
Lithium carbonate	554-13-2	1A	10 tonnes MPO	N/A
Maleic anhydride	108-31-6	1A	10 tonnes MPO	VOC
Manganese (and its compounds)^{Footnote 3}	NA - 09	1A	10 tonnes MPO	N/A
2-Mercaptobenzothiazole	149-30-4	1A	10 tonnes MPO	N/A
Methanol	67-56-1	1A	10 tonnes MPO	VOC
2-Methoxyethanol	109-86-4	1A	10 tonnes MPO	VOC
2-(2-Methoxyethoxy)ethanol	111-77-3	1A	10 tonnes MPO	N/A
2-Methoxyethyl acetate	110-49-6	1A	10 tonnes MPO	VOC
Methyl acrylate	96-33-3	1A	10 tonnes MPO	VOC
Methyl ethyl ketone	78-93-3	1A	10 tonnes MPO	VOC
Methyl iodide	74-88-4	1A	10 tonnes MPO	N/A
Methyl isobutyl ketone	108-10-1	1A	10 tonnes MPO	VOC
Methyl methacrylate	80-62-6	1A	10 tonnes MPO	VOC
Methyl tert-butyl ether	1634-04-4	1A	10 tonnes MPO	VOC
N-Methyl-2-pyrrolidone	872-50-4	1A	10 tonnes MPO	VOC
p,p'-Methylene bis(2-chloroaniline)	101-14-4	1A	10 tonnes MPO	VOC
1,1-Methylene bis(4-isocyanatocyclohexane)	5124-30-1	1A	10 tonnes MPO	N/A
Methylene bis(phenylisocyanate)	101-68-8	1A	10 tonnes MPO	VOC
p,p'-Methylenedianiline	101-77-9	1A	10 tonnes MPO	VOC
N-Methylolacrylamide	924-42-5	1A	10 tonnes MPO	N/A
Michler’s ketone (and its salts)^{Footnote 1}	90-94-8	1A	10 tonnes MPO	N/A
Molybdenum trioxide	1313-27-5	1A	10 tonnes MPO	N/A
Naphthalene	91-20-3	1A	10 tonnes MPO	VOC, PAH
Nickel (and its compounds)^{Footnote 3}	NA - 11	1A	10 tonnes MPO	N/A
Nitrate ion^{Footnote 9}	NA - 17	1A	10 tonnes MPO	N/A
Nitric acid	7697-37-2	1A	10 tonnes MPO	N/A
Nitrilotriacetic acid (and its salts)^{Footnote 1}	139-13-9	1A	10 tonnes MPO	N/A
Nitroglycerin	55-63-0	1A	10 tonnes MPO	N/A
2-Nitropropane	79-46-9	1A	10 tonnes MPO	N/A
N-Nitrosodiphenylamine	86-30-6	1A	10 tonnes MPO	N/A
Octylphenol and its ethoxylates^{Footnote 10}	NA - 21	1A	10 tonnes MPO	VOC
Peracetic acid (and its salts)^{Footnote 1}	79-21-0	1A	10 tonnes MPO	VOC
Phenol (and its salts)^{Footnote 1}	108-95-2	1A	10 tonnes MPO	VOC
p-Phenylenediamine (and its salts)	106-50-3	1A	10 tonnes MPO	N/A
Phosgene	75-44-5	1A	10 tonnes MPO	N/A
Phosphorus (total)^{Footnote 11}	NA - 22	1A	10 tonnes MPO	N/A
Phosphorus (yellow or white only)	7723-14-0	1A	10 tonnes MPO	N/A
Phthalic anhydride	85-44-9	1A	10 tonnes MPO	VOC
Polymeric diphenylmethane diisocyanate	9016-87-9	1A	10 tonnes MPO	N/A
Potassium bromate	7758-01-2	1A	10 tonnes MPO	N/A
Propionaldehyde	123-38-6	1A	10 tonnes MPO	VOC
Propylene	115-07-1	1A	10 tonnes MPO	VOC
Propylene oxide	75-56-9	1A	10 tonnes MPO	VOC
Pyridine (and its salts)^{Footnote 1}	110-86-1	1A	10 tonnes MPO	VOC
Silver (and its compounds)^{Footnote 3}	NA - 13	1A	10 tonnes MPO	N/A
Sodium fluoride	7681-49-4	1A	10 tonnes MPO	N/A
Sodium nitrite	7632-00-0	1A	10 tonnes MPO	N/A
Styrene	100-42-5	1A	10 tonnes MPO	VOC
Sulphuric acid	7664-93-9	1A	10 tonnes MPO	N/A
1,1,2,2-Tetrachloroethane	79-34-5	1A	10 tonnes MPO	VOC
1,1,1,2-Tetrachloroethane	630-20-6	1A	10 tonnes MPO	N/A
Tetrachloroethylene	127-18-4	1A	10 tonnes MPO	N/A
Thiourea	62-56-6	1A	10 tonnes MPO	N/A
Thorium dioxide	1314-20-1	1A	10 tonnes MPO	N/A
Titanium tetrachloride	7550-45-0	1A	10 tonnes MPO	N/A
Toluene	108-88-3	1A	10 tonnes MPO	VOC
Total reduced sulphur (expressed as hydrogen sulphide)^{Footnote 12}	NA - M14	1A	10 tonnes MPO	N/A
1,2,4-Trichlorobenzene	120-82-1	1A	10 tonnes MPO	N/A
1,1,2-Trichloroethane	79-00-5	1A	10 tonnes MPO	VOC
Trichloroethylene	79-01-6	1A	10 tonnes MPO	VOC
Triethylamine	121-44-8	1A	10 tonnes MPO	VOC
1,2,4-Trimethylbenzene	95-63-6	1A	10 tonnes MPO	VOC
2,2,4-Trimethylhexamethylene diisocyanate	16938-22-0	1A	10 tonnes MPO	N/A
Vanadium (and its compounds)^{Footnote 13}	NA-40	1A	10 tonnes MPO	N/A
Vinyl acetate	108-05-4	1A	10 tonnes MPO	VOC
Vinyl chloride	75-01-4	1A	10 tonnes MPO	VOC
Xylene (all isomers)^{Footnote 14}	1330-20-7	1A	10 tonnes MPO	VOC
Zinc (and its compounds)^{Footnote 3}	NA - 14	1A	10 tonnes MPO	N/A
Acrylonitrile	107-13-1	1B	1000 kg MPO	VOC
Arsenic (and its compounds)^{Footnote 3}	NA - 02	1B	50 kg MPO	N/A
Bisphenol A	80-05-7	1B	100 kg MPO	N/A
Cadmium (and its compounds)^{Footnote 3}	NA - 03	1B	5 kg MPO	N/A
Chlorinated alkanes, long-chain, CnHxCl(2n+2–x), 18 ≤ n ≤ 20^{Footnote 15}	NA - 38	1B	1000 kg MPO	N/A
Chlorinated alkanes, medium-chain, CnHxCl(2n+2–x), 14 ≤ n ≤ 17^{Footnote 16}	NA - 39	1B	1000 kg MPO	N/A
Cobalt (and its compounds)^{Footnote 3}	NA - 05	1B	50 kg MPO	N/A
Hexavalent chromium (and its compounds)^{Footnote 3}	NA - 19	1B	50 kg MPO	N/A
Hydrazine (and its salts)^{Footnote 1}	302-01-2	1B	1000 kg MPO	N/A
Isoprene	78-79-5	1B	100 kg MPO	VOC
Lead (and its compounds)^{Footnote 17}	NA - 08	1B	50 kg MPO	N/A
Mercury (and its compounds)^{Footnote 3}	NA - 10	1B	5 kg MPO	N/A
Nonylphenol and its ethoxylates^{Footnote 18}	NA - 20	1B	1000 kg MPO	VOC
Selenium (and its compounds)^{Footnote 3}	NA - 12	1B	100 kg MPO	N/A
Thallium (and its compounds)^{Footnote 3}	NA - 37	1B	100 kg MPO	N/A
Tetraethyl lead	78-00-2	1B	50 kg MPO	N/A
Toluene-2,4-diisocyanate	584-84-9	1B	100 kg MPO	VOC
Toluene-2,6-diisocyanate	91-08-7	1B	100 kg MPO	VOC
Toluenediisocyanate (mixed isomers)^{Footnote 19}	26471-62-5	1B	100 kg MPO	VOC
Acenaphthene	83-32-9	2	50 kg total PAHs	VOC, PAH
Acenaphthylene	208-96-8	2	50 kg total PAHs	VOC, PAH
Anthracene	120-12-7	2	50 kg total PAHs	VOC, PAH
Benz[a]anthracene	56-55-3	2	50 kg total PAHs	VOC, PAH
Benzo[a]pyrene	50-32-8	2	50 kg total PAHs	VOC, PAH
Benzo[b]fluoranthene	205-99-2	2	50 kg total PAHs	VOC, PAH
Benzo[e]pyrene	192-97-2	2	50 kg total PAHs	VOC, PAH
Benzo[ghi]perylene	191-24-2	2	50 kg total PAHs	VOC, PAH
Benzo[j]fluoranthene	205-82-3	2	50 kg total PAHs	VOC, PAH
Benzo[k]fluoranthene	207-08-9	2	50 kg total PAHs	VOC, PAH
Chrysene	218-01-9	2	50 kg total PAHs	VOC, PAH
Dibenzo[a,e]fluoranthene	5385-75-1	2	50 kg total PAHs	VOC, PAH
Dibenzo[a,e]pyrene	192-65-4	2	50 kg total PAHs	VOC, PAH
Dibenz[a,h]acridine	226-36-8	2	50 kg total PAHs	VOC, PAH
Dibenz[a,h]anthracene	53-70-3	2	50 kg total PAHs	VOC, PAH
Dibenzo[a,h]pyrene	189-64-0	2	50 kg total PAHs	VOC, PAH
Dibenzo[a,i]pyrene	189-55-9	2	50 kg total PAHs	VOC, PAH
Dibenz[a,j]acridine	224-42-0	2	50 kg total PAHs	VOC, PAH
Dibenzo[a,l]pyrene	191-30-0	2	50 kg total PAHs	VOC, PAH
7H-Dibenzo[c,g]carbazole	194-59-2	2	50 kg total PAHs	VOC, PAH
7,12-Dimethylbenz[a]anthracene	57-97-6	2	50 kg total PAHs	VOC, PAH
Fluoranthene	206-44-0	2	50 kg total PAHs	VOC, PAH
Fluorene	86-73-7	2	50 kg total PAHs	VOC, PAH
Indeno[1,2,3-cd]pyrene	193-39-5	2	50 kg total PAHs	VOC, PAH
3-Methylcholanthrene	56-49-5	2	50 kg total PAHs	VOC, PAH
5-Methylchrysene	3697-24-3	2	50 kg total PAHs	VOC, PAH
1-Nitropyrene	5522-43-0	2	50 kg total PAHs	VOC, PAH
Perylene	198-55-0	2	50 kg total PAHs	VOC, PAH
Phenanthrene	85-01-8	2	50 kg total PAHs	VOC, PAH
Pyrene	129-00-0	2	50 kg total PAHs	VOC, PAH
Quinoline	91-22-5	2	50 kg total PAHs	VOC, PAH
1,2,3,4,7,8,9-Heptachlorodibenzofuran	55673-89-7	3	Activity-based	N/A
1,2,3,4,6,7,8-Heptachlorodibenzofuran	67562-39-4	3	Activity-based	N/A
1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin	35822-46-9	3	Activity-based	N/A
Hexachlorobenzene	118-74-1	3	Activity-based	N/A
1,2,3,7,8,9-Hexachlorodibenzofuran	72918-21-9	3	Activity-based	N/A
1,2,3,6,7,8-Hexachlorodibenzofuran	57117-44-9	3	Activity-based	N/A
1,2,3,4,7,8-Hexachlorodibenzofuran	70648-26-9	3	Activity-based	N/A
2,3,4,6,7,8-Hexachlorodibenzofuran	60851-34-5	3	Activity-based	N/A
1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin	57653-85-7	3	Activity-based	N/A
1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin	39227-28-6	3	Activity-based	N/A
1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin	19408-74-3	3	Activity-based	N/A
Octachlorodibenzofuran	39001-02-0	3	Activity-based	N/A
Octachlorodibenzo-p-dioxin	3268-87-9	3	Activity-based	N/A
2,3,4,7,8-Pentachlorodibenzofuran	57117-31-4	3	Activity-based	N/A
1,2,3,7,8-Pentachlorodibenzofuran	57117-41-6	3	Activity-based	N/A
1,2,3,7,8-Pentachlorodibenzo-p-dioxin	40321-76-4	3	Activity-based	N/A
2,3,7,8-Tetrachlorodibenzofuran	51207-31-9	3	Activity-based	N/A
2,3,7,8-Tetrachlorodibenzo-p-dioxin	1746-01-6	3	Activity-based	N/A
Carbon monoxide	630-08-0	4	20 tonnes release	N/A
Nitrogen oxides (expressed as nitrogen dioxide)	11104-93-1	4	20 tonnes release	N/A
PM2.5^{Footnote 20}^{Footnote 21}	NA - M10	4	0.3 tonnes release	N/A
PM10^{Footnote 21}^{Footnote 22}	NA - M09	4	0.5 tonnes release	N/A
Sulphur dioxide	7446-09-5	4	20 tonnes release	N/A
Total Particulate Matter^{Footnote 21}^{Footnote 23}	NA - M08	4	20 tonnes release	N/A
Volatile Organic Compounds (VOCs)^{Footnote 24}	NA - M16	4	10 tonnes release	VOC
Acetylene	74-86-2	5	1 tonne air release	VOC
Adipic acid	124-04-9	5	1 tonne air release	VOC
Analytically unresolved hydrocarbons (C10 to C16+)^{Footnote 30}	NA - 44	5	1 tonne air release	VOC
Benzene	71-43-2	5	1 tonne air release	VOC
1,3-Butadiene	106-99-0	5	1 tonne air release	VOC
Butane (all isomers)	NA - 24	5	1 tonne air release	VOC
Butene (all isomers)	25167-67-3	5	1 tonne air release	VOC
2-Butoxyethanol	111-76-2	5	1 tonne air release	VOC
Butyl acetate (all isomers)^{Footnote 25}	NA – 41	5	1 tonne air release	VOC
Cycloheptane	NA - 25	5	1 tonne air release	VOC
Cyclohexene	NA - 26	5	1 tonne air release	VOC
Cyclooctane	NA - 27	5	1 tonne air release	VOC
Decane (all isomers)	NA - 28	5	1 tonne air release	VOC
p-Dichlorobenzene	106-46-7	5	1 tonne air release	VOC
1,2-Dichloroethane	107-06-2	5	1 tonne air release	VOC
Dimethylether	115-10-6	5	1 tonne air release	VOC
Ethyl acetate	141-78-6	5	1 tonne air release	VOC
Ethanol	64-17-5	5	1 tonne air release	VOC
Ethylene	74-85-1	5	1 tonne air release	VOC
Ethyltoluene (all isomers)^{Footnote 26}	NA – 42	5	1 tonne air release	VOC
Formaldehyde	50-00-0	5	1 tonne air release	VOC
Furfuryl alcohol	98-00-0	5	1 tonne air release	VOC
Heavy alkylate naphtha	64741-65-7	5	1 tonne air release	VOC
Heavy aromatic solvent naphtha	64742-94-5	5	1 tonne air release	VOC
Heptane (all isomers)	NA - 31	5	1 tonne air release	VOC
n-Hexane	110-54-3	5	1 tonne air release	VOC
Hexane^{Footnote 27}	NA - 32	5	1 tonne air release	VOC
Hexene (all isomers)	25264-93-1	5	1 tonne air release	VOC
Hydrotreated heavy naphtha	64742-48-9	5	1 tonne air release	VOC
Hydrotreated light distillate	64742-47-8	5	1 tonne air release	VOC
Isopropyl alcohol	67-63-0	5	1 tonne air release	VOC
Light aromatic solvent naphtha	64742-95-6	5	1 tonne air release	VOC
D-Limonene	5989-27-5	5	1 tonne air release	VOC
Methanol	67-56-1	5	1 tonne air release	VOC
Methylcyclopentane	96-37-7	5	1 tonne air release	VOC
Methyl ethyl ketone	78-93-3	5	1 tonne air release	VOC
Methyl isobutyl ketone	108-10-1	5	1 tonne air release	VOC
Mineral spirits	64475-85-0	5	1 tonne air release	VOC
Myrcene	123-35-3	5	1 tonne air release	VOC
Naphtha	8030-30-6	5	1 tonne air release	VOC
Nonane (all isomers)	NA - 33	5	1 tonne air release	VOC
Other glycol ethers and acetates (and their isomers)^{Footnote 31}	NA - 45	5	1 tonne air release	VOC
Octane (all isomers)	NA - 34	5	1 tonne air release	VOC
Pentane (all isomers)	NA - 35	5	1 tonne air release	VOC
Pentene (all isomers)	NA - 36	5	1 tonne air release	VOC
beta-Phellandrene	555-10-2	5	1 tonne air release	VOC
alpha-Pinene	80-56-8	5	1 tonne air release	VOC
beta-Pinene	127-91-3	5	1 tonne air release	VOC
Propane	74-98-6	5	1 tonne air release	VOC
Propyl acetate (all isomers)^{Footnote 28}	NA – 43	5	1 tonne air release	VOC
n-Propyl alcohol	71-23-8	5	1 tonne air release	VOC
Propylene	115-07-1	5	1 tonne air release	VOC
Propylene glycol methyl ether acetate	108-65-6	5	1 tonne air release	VOC
Solvent naphtha light aliphatic	64742-89-8	5	1 tonne air release	VOC
Solvent naphtha medium aliphatic	64742-88-7	5	1 tonne air release	VOC
Stoddard solvent	8052-41-3	5	1 tonne air release	VOC
Styrene	100-42-5	5	1 tonne air release	VOC
Tetrahydrofuran	109-99-9	5	1 tonne air release	VOC
Toluene	108-88-3	5	1 tonne air release	VOC
1,2,4-Trimethylbenzene	95-63-6	5	1 tonne air release	VOC
Trimethylbenzene^{Footnote 29}	25551-13-7	5	1 tonne air release	VOC
Vinyl acetate	108-05-4	5	1 tonne air release	VOC
VM & P naphtha	8032-32-4	5	1 tonne air release	VOC
White mineral oil	8042-47-5	5	1 tonne air release	VOC
Xylene (all isomers)	1330-20-7	5	1 tonne air release	VOC

Substance Notes:

Footnote 1

Return to footnote1 Referrer

Total of the acid or base and its salts, expressed as the molecular weight of the acid or base. The CAS RN corresponds to the weak acid or base.

Footnote 2

Return to footnote2 Referrer

Total of ammonia (NH3 - CAS RN 7664-41-7) and the ammonium ion (NH4+ - CAS RN 14798-03-9) in solution, expressed as ammonia.

Footnote 3

Return to footnote3 Referrer

Total of the pure element and the equivalent weight of the element contained in any compound, alloy or mixture.

Footnote 4

Return to footnote4 Referrer

Total of pure chromium and the equivalent weight of chromium contained in any compound, alloy or mixture. Excludes hexavalent chromium (and its compounds).

Footnote 5

Return to footnote5 Referrer

Total of all isomers of cresol: m-cresol (CAS RN 108-39-4), o-cresol (CAS RN 95-48-7) and p-cresol (CAS RN 106-44-5).

Footnote 6

Return to footnote6 Referrer

Total of all isomers, including, but not limited to, isomers with CAS RN 354-12-1, 354-15-4 and 354-21-2.

Footnote 7

Return to footnote7 Referrer

Total of all isomers, including, but not limited to, isomers with CAS RN 306-83-2, 354-23-4, 812-04-4 and 90454-18-5.

Footnote 8

Return to footnote8 Referrer

Total of all isomers, including, but not limited to, isomers with CAS RN 76-14-2, 354-25-6, 374-07-2 and
2837-89-0.

Footnote 9

Return to footnote9 Referrer

Nitrate ion in solution at a pH of 6.0 or more.

Footnote 10

Return to footnote10 Referrer

Total of octylphenol and its ethoxylates, limited to: CAS RN 140-66-9, 1806-26-4, 27193-28-8, 68987-90-6, 9002-93-1, and 9036-19-5.

Footnote 11

Return to footnote11 Referrer

Excludes yellow or white phosphorous (CAS RN 7723-14-0).

Footnote 12

Return to footnote12 Referrer

Total of hydrogen sulphide (CAS RN 7783-06-4), carbon disulphide (CAS RN 75-15-0), carbonyl sulphide (CAS RN 463-58-1), dimethyl sulphide (CAS RN 75-18-3), dimethyl disulphide (CAS RN 624-92-0), and methyl mercaptan (CAS RN 74-93-1), expressed as hydrogen sulphide.

Footnote 13

Return to footnote13 Referrer

Total of pure vanadium and the equivalent weight of vanadium contained in any compound or mixture. Excludes vanadium contained in an alloy.

Footnote 14

Return to footnote14 Referrer

Total of all isomers of xylene: m-xylene (CAS RN 108-38-3), o-xylene (CAS RN 95-47-6) and p-xylene (CAS RN 106-42-3).

Footnote 15

Return to footnote15 Referrer

Including, but not limited to, chloroalkanes, C18-20 (CAS RN 106232-85-3), as well as substances or components of mixtures which meet the molecular formula definition.

Footnote 16

Return to footnote16 Referrer

Including, but not limited to, chloroalkanes, C14-17 (CAS RN 85535-85-9), as well as substances or components of mixtures which meet the molecular formula definition.

Footnote 17

Return to footnote17 Referrer

Total of pure lead and the equivalent weight of lead contained in any compound, alloy or mixture. Excludes lead (and its compounds) contained in stainless steel, brass or bronze alloys and lead contained in tetraethyl lead (CAS RN 78-00-2).

Footnote 18

Return to footnote18 Referrer

Total of nonylphenol, its ethoxylates and derivatives, limited to: CAS RN 104-40-5, 25154-52-3, 84852-15-3, 1323-65-5, 26523-78-4, 28987-17-9, 68081-86-7, 68515-89-9, 68515-93-5, 104-35-8, 20427-84-3, 26027-38-3, 27177-05-5, 27177-08-8, 28679-13-2, 27986-36-3, 37251-69-7, 7311-27-5, 9016-45-9, 27176-93-8, 37340-60-6, 51811-79-1, 51938-25-1, 68412-53-3, 9051-57-4, 37205-87-1, 68412-54-4, and 127087-87-0.

Footnote 19

Return to footnote19 Referrer

Total of all isomers occurring in mixtures.

Footnote 20

Return to footnote20 Referrer

Particulate matter with a diameter less than or equal to 2.5 micrometres.

Footnote 21

Return to footnote21 Referrer

Filterable particulate matter, on a dry basis. Excludes condensable particulate matter.

Footnote 22

Return to footnote22 Referrer

Particulate matter with a diameter less than or equal to 10 micrometres.

Footnote 23

Return to footnote23 Referrer

Particulate matter with a diameter less than 100 micrometres.

Footnote 24

Return to footnote24 Referrer

Volatile organic compounds as set out in section 65 of the List of Toxic sSubstances in sSchedule 1 of the Canadian Environmental Protection Act, 1999.

Footnote 25

Return to footnote25 Referrer

Total of n-butyl acetate (CAS RN 123-86-4), isobutyl acetate (CAS RN 110-19-0), and sec-butyl acetate (CAS RN 105-46-4). Excludes tert-butyl acetate (CAS RN 540-88-5).

Footnote 26

Return to footnote26 Referrer

Total of all isomers of ethyltoluene: 2-ethyltoluene (CAS RN 611-14-3), 3-ethyltoluene (CAS RN 620-14-4), and 4-ethyltoluene (CAS RN 622-96-8).

Footnote 27

Return to footnote27 Referrer

Total of all isomers. Excludes n-hexane (CAS RN 110-54-3).

Footnote 28

Return to footnote28 Referrer

Total of all isomers of propyl acetate: isopropyl acetate (CAS RN 108-21-4) and propyl acetate (CAS RN 109-60-4).

Footnote 29

Return to footnote29 Referrer

Total of 1,2,3-trimethylbenzene (CAS RN 526-73-8) and 1,3,5-trimethylbenzene (CAS RN 108-67-8). Excludes 1,2,4-trimethylbenzene (CAS RN 95-63-6).

Footnote 30

Return to footnote30 Referrer

An agglomeration of volatile organic compounds in the C₁₀ to C₁₆+ range that could not be separated into individual components by the selected gas chromatography column.

Footnote 31

Return to footnote31 Referrer

Total of CAS RNs 112-07-2, 112-15-2, 112-25-4, 112-34-5, 5131-66-8, 107-98-2, 109-59-1, 111-90-0, 124-17-4, 1569-01-3, 1569-02-4, 2807-30-9, 29911-27-1, 29911-28-2, 34590-94-8, 54839-24-6, 623-84-7 and 88917-22-0, and their isomers.

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