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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">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">2025.</marc:subfield>
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      <marc:subfield code="c">©2025</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 2025."</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (page 49).</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. These pollutants can affect the health of people in Canada, the environment, infrastructure and the economy. The majority of these pollutants are released through human activities, such as the burning of fuels for electricity and heating, transportation, and industrial activities. The indicators on sulphur oxides (SOX), nitrogen oxides (NOX), volatile organic compounds (VOCs), carbon monoxide (CO), ammonia (NH3), fine particulate matter (PM2.5) and black carbon, a component of PM2.5, report emissions released through human activities"--Air pollutant emissions, page 7.</marc:subfield>
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      <marc:subfield code="a">Canada. </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="b">June 2024</marc:subfield>
      <marc:subfield code="w">(CaOODSP)9.934425</marc:subfield>
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      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2025/eccc/en4/En4-144-22-2025-eng.pdf</marc:subfield>
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