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About the NPI

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List of NPI substances

The NPI contains data on 93 priority substances which are emitted to the environment. The substance list has been determined by consideration of the potential impacts of substances on health and the environment.

There are three tables which relate to substances listed for reporting to the NPI.

Table 1 - the 93 substances listed on the NPI from the tenth reporting year (2007- 08 onward)
prefix Substance CAS No. Threshold Category Threshold
  Acetaldehyde 75-07-0 1 10 tonnes per year
  Acetic acid (ethanoic acid) 64-19-7 1 10 tonnes per year
  Acetone 67-64-1 1 10 tonnes per year
  Acetonitrile 75-05-8 1 10 tonnes per year
  Acrolein 107-02-8 1 10 tonnes per year
  Acrylamide 79-06-1 1 10 tonnes per year
  Acrylic acid 79-10-7 1 10 tonnes per year
  Acrylonitrile (2-propenenitrile) 107-13-1 1 10 tonnes per year
  Ammonia (total) N/A 1 10 tonnes per year
  Aniline (benzenamine) 62-53-3 1 10 tonnes per year
  Antimony & compounds 7440-36-0 1 10 tonnes per year
  Arsenic & compounds 7440-38-2 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Benzene 71-43-2 1 10 tonnes per year
  Benzene hexachloro- (HCB) 118-74-1 1 10 tonnes per year
  Beryllium & compounds 7440-41-7 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Biphenyl (1,1-biphenyl) 92-52-4 1 10 tonnes per year
  Boron & compounds 7440-42-8 1 10 tonnes per year
1,3- Butadiene (vinyl ethylene) 106-99-0 1 10 tonnes per year
  Cadmium & compounds 7440-43-9 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Carbon disulfide 75-15-0 1 10 tonnes per year
  Carbon monoxide 630-08-0 1 10 tonnes per year
      2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Chlorine & compounds N/A 1 10 tonnes per year
  Chlorine dioxide 10049-04-4 1 10 tonnes per year
  Chloroethane (ethyl chloride) 75-00-3 1 10 tonnes per year
  Chloroform (trichloromethane) 67-66-3 1 10 tonnes per year
  Chlorophenols (di, tri, tetra) N/A 1 10 tonnes per year
  Chromium (III) compounds 7440-47-3 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Chromium (VI) compounds 7440-47-3 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Cobalt & compounds 7440-48-4 1 10 tonnes per year
  Copper & compounds 7440-50-8 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Cumene (1-methylethylbenzene) 98-82-8 1 10 tonnes per year
  Cyanide (inorganic) compounds N/A 1 10 tonnes per year
  Cyclohexane 110-82-7 1 10 tonnes per year
1,2- Dibromoethane 106-93-4 1 10 tonnes per year
  Dibutyl phthalate 84-74-2 1 10 tonnes per year
1,2- Dichloroethane 107-06-2 1 10 tonnes per year
  Dichloromethane 75-09-2 1 10 tonnes per year
  Ethanol 64-17-5 1 10 tonnes per year
2- Ethoxyethanol 110-80-5 1 10 tonnes per year
2- Ethoxyethanol acetate 111-15-9 1 10 tonnes per year
  Ethyl acetate 141-78-6 1 10 tonnes per year
  Ethyl butyl ketone 106-35-4 1 10 tonnes per year
  Ethylbenzene 100-41-4 1 10 tonnes per year
  Ethylene glycol (1,2-ethanediol) 107-21-1 1 10 tonnes per year
  Ethylene oxide 75-21-8 1 10 tonnes per year
  Di-(2-Ethylhexyl) phthalate (DEHP) 117-81-7 1 10 tonnes per year
  Fluoride compounds N/A 1 10 tonnes per year
      2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Formaldehyde (methyl aldehyde) 50-00-0 1 10 tonnes per year
  Glutaraldehyde 111-30-8 1 10 tonnes per year
n- Hexane 110-54-3 1 10 tonnes per year
  Hydrochloric acid 7647-01-0 1 10 tonnes per year
      2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Hydrogen sulfide 7783-06-4 1 10 tonnes per year
  Lead & compounds 7439-92-1 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Magnesium oxide fume 1309-48-4 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Manganese & compounds 7439-96-5 1 10 tonnes per year
  Mercury & compounds 7439-97-6 1b 5 kilograms per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Methanol 67-56-1 1 10 tonnes per year
2- Methoxyethanol 109-86-4 1 10 tonnes per year
2- Methoxyethanol acetate 110-49-6 1 10 tonnes per year
  Methyl ethyl ketone 78-93-3 1 10 tonnes per year
  Methyl isobutyl ketone 108-10-1 1 10 tonnes per year
  Methyl methacrylate 80-62-6 1 10 tonnes per year
4,4'- Methylene-bis(2-chloroaniline) (MOCA) 101-14-4 1 10 tonnes per year
  Methylenebis (phenylisocyanate) 101-68-8 1 10 tonnes per year
  Nickel & compounds 7440-02-0 1 10 tonnes per year
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Nickel carbonyl 13463-39-3 1 10 tonnes per year
     
  Nickel subsulfide 12035-72-2 1 10 tonnes per year
     
  Nitric acid 7697-37-2 1 10 tonnes per year
  Organo-tin compounds N/A 1 10 tonnes per year
  Oxides of Nitrogen N/A 2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Particulate Matter ≤2.5 µm (PM2.5) N/A 2a 400 tonnes per year, or 1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Particulate Matter ≤10.0 µm (PM10) N/A 2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Phenol 108-95-2 1 10 tonnes per year
  Phosphoric acid 7664-38-2 1 10 tonnes per year
  Polychlorinated biphenyls N/A 1 10 tonnes per year
  Polychlorinated dioxins and furans (TEQ) N/A 2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Polycyclic aromatic hydrocarbons (B[a]Peq) N/A 2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Selenium & compounds 7782-49-2 1 10 tonnes per year
  Styrene (ethenylbenzene) 100-42-5 1 10 tonnes per year
  Sulfur dioxide 7446-09-5 1 10 tonnes per year
      2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
  Sulfuric acid 7664-93-9 1 10 tonnes per year
1,1,2,2- Tetrachloroethane 79-34-5 1 10 tonnes per year
  Tetrachloroethylene 127-18-4 1 10 tonnes per year
  Toluene (methylbenzene) 108-88-3 1 10 tonnes per year
  Toluene-2,4-diisocyanate 584-84-9 1 10 tonnes per year
  Total Nitrogen N/A 3 15 tonnes per year
  Total Phosphorus N/A 3 3 tonnes per year
  Total Volatile Organic Compounds N/A 1a 25 tonnes per year, or a
design capacity of 25
kilotonnes for bulk
storage facilities
      2a 400 tonnes per year, or
1 tonne per hour
      2b 2,000 tonnes per year,
or 60,000 megawatt
hours, or rated at 20 megawatts
1,1,2- Trichloroethane 79-00-5 1 10 tonnes per year
  Trichloroethylene 79-01-6 1 10 tonnes per year
  Vinyl chloride monomer 75-01-4 1 10 tonnes per year
  Xylenes (individual or mixed isomers) 1330-20-7 1 10 tonnes per year
  Zinc and compounds 7440-66-6 1 10 tonnes per year

More information about reporting some NPI substances.

  1. In this Schedule:
    1. the threshold for category 1 acids refers to the amount of the acid compound used (for example, in the case of Hydrochloric acid, the threshold refers to the amount of hydrogen chloride used). This amount can be calculated as a factor of volume and concentration;
    2. the thresholds for'Total Nitrogen' and 'Total Phosphorus' refer only to the amounts of those Nitrogen and Phosphorus compounds that give rise to nitrate/nitrite and phosphate ions respectively and, for transfers, the thresholds of 'Total Nitrogen' and 'Total Phosphorus' refer only to the amounts of soluble compounds of Nitrogen and Phosphorus that are in materials that readily permit the dissolution of these substances;
    3. the threshold for Ammonia (total) refers to the total amount of both ammonia (NH3 CAS number 7664-41-7) and the ammonium ion (NH4+) in solution;
    4. the threshold for 'Chlorine & compounds' includes the amount of chlorine compounds used which may produce emissions of chlorine gas (Cl2), free residual chlorine, hypochlorite ion (OCl-), hypochlorous acid (HOCl) or chloramines;
    5. the threshold for category 1 or category 1b substances that are listed as '(a metal) & compounds' refers to the total amount of the metal and its compounds used (for example, 'Lead & compounds' refers to Lead and all compounds which incorporate Lead);
  2. For the purposes of estimating emission and mandatory transfer data to be reported under clause 9 of the Measure:
    1. the amount of a category 1 acid emitted refers to the amount of the actual acid compound emitted (for example, in the case of Hydrochloric acid, the amount emitted refers to the amount of hydrogen chloride emitted). It does not include any amounts of the acid that have been neutralised before release as the acid no longer exists;
    2. the amounts of 'Total Nitrogen' and 'Total Phosphorus' emitted or transferred refer to the amounts of those nitrogen and phosphorus compounds emitted or transferred that give rise to nitrate/nitrite and phosphate ions respectively and, for transfers, the amounts of 'Total Nitrogen' and 'Total Phosphorus' transferred refer only to the amounts of soluble compounds of nitrogen and phosphorus that are in materials that readily permit the dissolution of these substances;
    3. the amount of 'Ammonia (total)' emitted or transferred refers to the total amount of both ammonia (NH3 CAS number 7664-41-7) and the ammonium ion (NH4+) emitted or transferred in solution;
    4. the amount of 'Chlorine & compounds' emitted or transferred refers to the total amount of chlorine gas (Cl2), free residual chlorine, hypochlorite ion (OCl-), hypochlorous acid (HOCl) and chloramines emitted or transferred, expressed as the equivalent weight of chlorine (Cl);;
    5. the amount emitted in relation to a substance listed as (a metal) & compounds refers only to the amount of the metal emitted (for example, the amount of Lead & compounds emitted refers only to the amount of Lead emitted);
    6. the amount of 'Polychlorinated Dioxins and Furans (TEQ)' emitted or transferred refers to the sum of the toxic equivalent amounts of the individual congeners emitted. Toxic equivalent amounts are obtained by multiplying the mass of the congener by the Toxicity Equivalency Factor published in industry reporting materials;
    7. the amount of 'Polycyclic Aromatic Hydrocarbons (Benzo[a]pyrene equivalent) (PAHs B[a]Peq)' emitted refers to the sum of the toxic equivalent amounts of the individual congeners emitted or transferred. Toxic equivalent amounts are obtained by multiplying the mass of the congener by the Toxicity Equivalency Factor published in industry reporting materials;
    8. the amount of 'Oxides of Nitrogen' emitted refers to the mass of Nitrogen oxide and Nitrogen dioxide expressed as the equivalent mass of Nitrogen dioxide according to the protocol published in industry reporting materials;
    9. the amount of 'Particulate Matter ≤2.5 µm (PM2.5)' emitted refers only to the amount emitted from the burning of fuel or waste.
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