NWT Air Quality Report (2011) - Environment and Natural ...
NWT Air Quality Report (2011) - Environment and Natural ...
NWT Air Quality Report (2011) - Environment and Natural ...
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<strong>NWT</strong> <strong>Air</strong><strong>Quality</strong> St<strong>and</strong>ardsThe Government of the <strong>NWT</strong> has adopted a number of concentration limits for protection ofambient (outdoor) air quality in the <strong>NWT</strong>. These limits apply to select pollutants <strong>and</strong> are containedin the “Guideline for Ambient <strong>Air</strong> <strong>Quality</strong> St<strong>and</strong>ards in the Northwest Territories”, establishedunder the <strong>NWT</strong> <strong>Environment</strong>al Protection Act. They are summarized in Table 3 below.The <strong>NWT</strong> st<strong>and</strong>ards are used in the assessment of air quality monitoring data as well asdetermining the acceptability of emissions from proposed <strong>and</strong> existing developments. Where<strong>NWT</strong> st<strong>and</strong>ards are not available for a particular pollutant, the Canadian National Ambient <strong>Air</strong><strong>Quality</strong> Objectives (national st<strong>and</strong>ards) or limits established in other jurisdictions are used.Table 3 – <strong>NWT</strong> Ambient <strong>Air</strong> <strong>Quality</strong> St<strong>and</strong>ardsParameter <strong>and</strong> St<strong>and</strong>ardSulphur Dioxide (SO 2)1-hour average24-hour averageAnnual arithmetic meanConcentration(μg/m 3 )*45015030Concentration(ppbv)**Ground Level Ozone (O 3)8-hour running average 130 65Total Suspended Particulate (TSP)24-hour averageAnnual geometric mean12060Fine Particulate Matter (PM 2.5)24-hour average 30Nitrogen Dioxide (NO 2)1-hour average24-hour averageAnnual arithmetic meanCarbon Monoxide (CO)1-hour average8-hour average* Micrograms per cubic metre** Parts per billion by volume4002006015,000 (15mg/m 3 )6,000 (6mg/m 3 )17257112131063213,0005,000The “Guideline for Ambient <strong>Air</strong> <strong>Quality</strong> St<strong>and</strong>ards in the Northwest Territories” providesadditional information on the application of the <strong>NWT</strong> st<strong>and</strong>ards <strong>and</strong> the pollutants ofconcern. For additional information on air pollutants, see Appendix B.10 <strong>NWT</strong> <strong>Air</strong> <strong>Quality</strong> <strong>Report</strong> <strong>2011</strong>