PM2.5 air pollution, population exposed to levels exceeding WHO guideline value (% of total)
Percent of population exposed to ambient concentrations of PM2.5 that exceed the WHO guideline value is defined as the portion of a country’s population living in places where mean annual concentrations of PM2.5 are greater than 10 micrograms per cubic meter, the guideline value recommended by the World Health Organization as the lower end of the range of concentrations over which adverse health effects due to PM2.5 exposure have been observed. More info »
1990
1993
1997
2000
2004
2007
2010
2014
2017
0.00
20.00
40.00
60.00
80.00
100.00
Sierra Leone
Data source: World Bank, World Development Indicators - Last updated January 1, 2020