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      <marc:subfield code="a">Canadian environmental sustainability indicators : </marc:subfield>
      <marc:subfield code="b">air pollutant emissions.</marc:subfield>
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      <marc:subfield code="a">Gatineau, QC : </marc:subfield>
      <marc:subfield code="b">Environment and Climate Change Canada = Environnement et changement climatique Canada, </marc:subfield>
      <marc:subfield code="c">2019.</marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Indicateurs canadiens de durabilité de l'environnement : émissions de polluants atmosphériques.</marc:subfield>
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      <marc:subfield code="a">"June 2019."</marc:subfield>
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      <marc:subfield code="a">Issued also in HTML format.</marc:subfield>
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      <marc:subfield code="a">"Air pollution problems, such as smog and acid rain, result from the release of pollutants into the atmosphere. The majority of these pollutants are released through human activities, such as transportation, the burning of fuels for electricity and heating, and a variety of industrial activities. The indicators on sulphur oxides (SOX), nitrogen oxides (NOX), volatile organic compounds (VOCs), carbon monoxide (CO), ammonia (NH3) and fine particulate matter (PM2.5) report emissions released through human activities"--Page 7.</marc:subfield>
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      <marc:subfield code="t">Indicateurs canadiens de durabilité de l'environnement : </marc:subfield>
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      <marc:subfield code="t">Canadian environmental sustainability indicators : </marc:subfield>
      <marc:subfield code="w">(CaOODSP)9.890340</marc:subfield>
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      <marc:subfield code="t">Canadian environmental sustainability indicators </marc:subfield>
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      <marc:subfield code="q">PDF</marc:subfield>
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      <marc:subfield code="q">HTML</marc:subfield>
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      <marc:subfield code="u">https://www.canada.ca/en/environment-climate-change/services/environmental-indicators/air-pollutant-emissions.html</marc:subfield>
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