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    <marc:controlfield tag="003">CaOODSP</marc:controlfield>
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      <marc:subfield code="a">The 2008 Canadian atmospheric assessment of agricultural ammonia </marc:subfield>
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      <marc:subfield code="a">Ottawa - Ontario : </marc:subfield>
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      <marc:subfield code="a">Atmospheric ammonia (NH3) has been linked to many major air pollution issues. Of particular interest is the relationship between atmospheric NH3 and particulate matter (PM). The potential role of NH3 on human health led to the production of an in-depth assessment of atmospheric ammonia. Such an assessment addressing all aspects of atmospheric ammonia is of value especially in light of all the knowledge gaps that currently exist in ammonia science. These gaps were specifically addressed in this assessment, including our knowledge of NH3 atmospheric chemistry, ambient NH3 levels, emissions, transport and contribution to PM formation and ambient PM levels.</marc:subfield>
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      <marc:subfield code="t">Évaluation canadienne 2008 de l'ammoniac atmosphérique d'origine agricole </marc:subfield>
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      <marc:subfield code="t">The 2008 Canadian atmospheric assessment of agricultural ammonia </marc:subfield>
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