Air quality: WHO guidelines could deepen inequities - Nature.com

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• CORRESPONDENCE
• 26 October 2021

Air quality: WHO guidelines could deepen inequities

• Forrest Lacey ⁰ ,
• Rajesh Kumar ¹ ,
• Gabriele Pfister ² ,
• Jean-Francois Lamarque ³ ,
• Cassandra O’Lenick ⁴ &
• Guy Brasseur ⁵

1. Forrest Lacey

   1. National Center for Atmospheric Research, Boulder, Colorado, USA.

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2. Rajesh Kumar

   1. National Center for Atmospheric Research, Boulder, Colorado, USA.

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3. Gabriele Pfister

   1. National Center for Atmospheric Research, Boulder, Colorado, USA.

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4. Jean-Francois Lamarque

   1. National Center for Atmospheric Research, Boulder, Colorado, USA.

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5. Cassandra O’Lenick

   1. National Center for Atmospheric Research, Boulder, Colorado, USA.

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6. Guy Brasseur

   1. Max Planck Institute for Meteorology, Hamburg, Germany.

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To curb the effects of anthropogenic air pollution on health, the World Health Organization (WHO) has halved its recommended limit for the annual average concentration of fine particulate matter (PM_2.5) to 5 micrograms per cubic metre. Given that 99% of the world’s population is living in areas where such small particulates exceed the WHO’s latest threshold, the contribution from natural sources of PM_2.5 — suspended atmospheric dust, for example — needs to be determined to help countries meet the guidelines.

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Nature 598, 566 (2021)

doi: https://doi.org/10.1038/d41586-021-02883-y

Competing Interests

The authors declare no competing interests.

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• Environmental sciences
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