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      <marc:subfield code="a">Canadian environmental sustainability indicators : </marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Indicateurs canadiens de durabilité de l'environnement : exposition de la population aux polluants atmosphériques extérieurs.</marc:subfield>
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      <marc:subfield code="a">"Breathing in air pollutants every day can contribute to health issues such as asthma and cardiovascular diseases. Overall, Canadians enjoy good outdoor air quality. This indicator tracks the percentage of the population living in areas where outdoor concentrations of air pollutants were below the 2020 Canadian Ambient Air Quality Standards"--Page 5.</marc:subfield>
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