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Glossary 

This glossary provides definitions of common terms used in the context of air pollution.

You can navigate quickly to a term using the alphabetic links below; clicking on the terms will show their definition.



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  • PAHs
  • Particulate matter (PM)
  • Parts per billion, ppb
  • Parts per million, ppm
  • Percentile
  • POPs
    Persistent Organic Pollutants (POPs) are chemical substances that persist in the environment as they are resistant to environmental degradation via chemical, biological or photolytic processes. The compounds are known to bioaccumulate through the food web and pose a risk of causing adverse effects to human health and the environment. These include dioxins and furans (see TOMPS)

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Page last modified: 14 February 2011