What is the difference in exposure to outdoor air pollution in urban areas between Guinea and Sierra Leone?

1.22 micrograms per cubic meter, with Sierra Leone ahead.

How many years of comparable data are there for Guinea and Sierra Leone?

14 years are reported by both, from 2010 to 2023.

Where does this data come from?

World Health Organization – processed by Our World in Data, published as Exposure to outdoor air pollution in urban areas. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Guinea vs Sierra Leone: Exposure to outdoor air pollution in urban areas

Guinea

35.68 micrograms per cubic meter

in 2023

Sierra Leone

36.9 micrograms per cubic meter

in 2023

Guinea rank

25th

Sierra Leone rank

23rd

Exposure to outdoor air pollution in urban areas over time

Guinea
Sierra Leone

How they compare

Sierra Leone currently reports 36.9 micrograms per cubic meter against 35.68 micrograms per cubic meter in Guinea, a difference of 1.22 micrograms per cubic meter.

The two have swapped places 5 times across 14 shared years of data; in 2010 it was Guinea ahead.

Guinea ranks 25th and Sierra Leone ranks 23rd of 226 countries.

Sierra Leone has averaged higher in every one of the 2 decades both report.

Head to head by decade

Decade	Guinea	Sierra Leone	Difference	Ahead
2010s	35 micrograms per cubic meter	35.23 micrograms per cubic meter	0.228 micrograms per cubic meter	Sierra Leone
2020s	35.67 micrograms per cubic meter	35.75 micrograms per cubic meter	0.0775 micrograms per cubic meter	Sierra Leone

Averages of every year both report within each decade.

Frequently asked questions

Which has higher exposure to outdoor air pollution in urban areas, Guinea or Sierra Leone?: Sierra Leone, at 36.9 micrograms per cubic meter against 35.68 micrograms per cubic meter in Guinea as of 2023.
What is the difference in exposure to outdoor air pollution in urban areas between Guinea and Sierra Leone?: 1.22 micrograms per cubic meter, with Sierra Leone ahead.
How many years of comparable data are there for Guinea and Sierra Leone?: 14 years are reported by both, from 2010 to 2023.
How do Guinea and Sierra Leone rank globally for exposure to outdoor air pollution in urban areas?: Guinea ranks 25th and Sierra Leone ranks 23rd of 226 countries.
Where does this data come from?: World Health Organization – processed by Our World in Data, published as Exposure to outdoor air pollution in urban areas. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Guinea vs Sierra Leone: Exposure to outdoor air pollution in urban areas. Statizoid, drawing on World Health Organization – processed by Our World in Data. Retrieved 05 September 2026, from https://environment.statizoid.com/compare/exposure-to-outdoor-air-pollution-in-urban-areas/guinea/sierra-leone/

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<a href="https://environment.statizoid.com/compare/exposure-to-outdoor-air-pollution-in-urban-areas/guinea/sierra-leone/">Guinea vs Sierra Leone: Exposure to outdoor air pollution in urban areas</a> — Statizoid

About this data

Indicator: Exposure to outdoor air pollution in urban areas
Unit: micrograms per cubic meter
Source: World Health Organization – processed by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 226 places, 3,156 data points, 2010–2023
Last refreshed: 28 August 2026

Annual mean levels of fine particulate matter (population-weighted), by location (micrograms per cubic meter).