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WHO Air Quality Guideline

Guideline set by the World Health Organization for exposure to fine particle (PM2.5) ozone, 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 , 60 µg/m3 , and 10 µg/m3 for NO2 (based on data averaged over one year). Learn more. 

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.
     
  • Two interim air quality targets set by the World Health Organization for annual average nitrogen dioxide (NO2) concentrations (daily maximum 8-hour mean ozone concentration in the six consecutive months with the highest six-month running-average ozone concentration): IT-1 ≤ 100 µg/m3 and IT-2 ≤ 70 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 Asian 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, Africa. See World Bank.