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WHO Air Quality Guideline

Guideline set by the World Health Organization for exposure to fine particle (PM2.5) and nitrogen dioxide (NO2), based on evidence of the health effects of long-term exposure to these pollutants. The guideline is set at an annual average concentration of 5 µg/m3 for PM2.5 and 10 µg/m3 for NO2 (based on data averaged over one year).

WHO Interim Targets

  • Four interim air quality targets (IT) set by the World Health Organization for annual average fine particle (PM2.5) concentrations (based on data averaged over one year): IT-1 ≤ 35 µg/m3; IT-2 ≤ 25 µg/m3; IT-3 ≤ 15 µg/m3; and IT-4 ≤ 10 µg/m3.
     
  • Three interim air quality targets set by the World Health Organization for annual average nitrogen dioxide (NO2) concentrations (based on data averaged over one year): IT-1 ≤ 40 µg/m3; IT-2 ≤ 30 µg/m3; and IT-3 ≤ 20 µg/m3.

WHO regions

Groupings of countries used by the World Health Organization: African region (AFRO), European region (EURO), Region of the Americas (PAHO), South-East Asia Region (SEARO), Western Pacific Region (WPRO), and Eastern Mediterranean Region (EMRO). 

World Bank income levels

Groupings of countries used by the World Bank based on income levels: High Income, Upper Middle Income, Lower Middle Income, and Low Income

World Bank regions

Groupings of countries used by the World Bank: South Asia, East Asia and Pacific, Europe and Central Asia, Latin America and Caribbean, Middle East and North Africa, Sub-Saharan Africa. See World Bank.