Abatement of Nuisances Regulations (Air Quality), 1992
(Summary)

Ambient standards for air pollutants are set out in these regulations.

 Part A - Gases  Pollutant         Chemical Formula  Concentration     Time period                                     (in milligrams                                     per cubic meter)  Ozone                 O3                0.230          0.5 hour                                         0.160          24 hours  Sulfur Dioxide        SO2*              0.500          0.5 hour                                         0.280          24 hours                                         0.060          1 year  1,2 Dichloroethane    CH2 Cl CH2 Cl     6.0            0.5 hour                                         2.0            24 hours  Dichloromethane       CH2 Cl2           6.0            0.5 hour                                         3.0            24 hours  Toluene               C7 H8            10.0            24 hours  Tetrachloroethylene   C2 Cl4            5.0            24 hours  Trichloroethylene     C2 HCl3           1.0            24 hours  Hydrogen Sulfide      H2 S              0.045          0.5 hour                                         0.015          24 hours  Styrene               C8 H8             0.100          0.5 hour  Formaldehyde          CH2 O             0.100          0.5 hour  Carbon Monoxide       CO               60.0            0.5 hour                                        11.0            8 hours  Nitrogen Oxides       NOx               0.940          0.5 hour (as NO2)                                0.560          24 hours   * 45 exceedances of the SO2 standard for 1/2 hour periods are permitted annually if they do not exceed 1.0 mg/m3.    Part B - Suspended Particulate Matter  Pollutant         Chemical Formula   Concentration     Time period                                      (in milligrams                                      per cubic meter)  Suspended               -               0.300            3 hours Particulate Matter                      0.200           24 hours                                         0.075            1 year  Respirable              -               0.150           24 hours Particulate Matter                      0.060            1 year  Vanadium                V               0.001           24 hours (in Suspended Particulate Matter)  Sulfate Salts          SO4              0.025           24 hours  Phosphate                               0.250          0.5 hours (in Suspended                           0.100           24 hours Particulate Matter)                     0.040            1 year  Lead (in Suspended     Pb               0.0050          24 hours Particulate Matter)                     0.0015          30 days                                         0.0005           1 year  Cadmium (in Suspended  Cd               0.00020         24 hours Particulate Matter)                     0.00006         30 days                                         0.00001          1 year   Part C - Settling Particles  Pollutant        Chemical Formula  Concentration    Time period                                    (in milligrams                                    per cubic meter)  Settling Dust          -                20            30 days  Phosphate              ?                0.25          24 hours                                         5             30 days