Sierra Leone · Urban PM2.5 Concentration (WHO)
36.92023
Unit: micrograms per cubic metre. Publisher measure: Concentrations of fine particulate matter (PM2.5).
Annual population-weighted PM2.5 concentration in urban areas, matching WHO SDG11.6.2 metadata; label urban scope explicitly.
Measurement basis: model-based estimate.
Displayed values are rounded, with extra precision when needed to keep a positive estimate positive. Downloads retain the full numeric estimate and the publisher's original display text separately.
A “<” sign means strictly below the stated number. Numeric readings and uncertainty endpoints keep their own comparison signs. A number without a sign does not establish certainty or an observed outcome.
World Health Organization (Global Health Observatory); retrieved 2026-09-07. Retrieval time is separate from an official publisher release vintage.
Download this immutable source capture · Source and coverage corrections
One row per country, indicator and year, with raw values, source links and reuse notices. Thresholds have an empty numeric value and separate number/operator fields; value_kind distinguishes upper bounds from absent readings.
History and uncertainty
Charts plot numeric readings. Reported upper bounds create gaps; their values, uncertainty endpoints and source notes remain available in the table and downloads.
Reported estimates and uncertainty · 14 rows
Each comparison sign applies to its own reading or uncertainty endpoint. Values retain source precision. “Not reported” identifies an absent reading or uncertainty endpoint in this source capture.
| Country | Year | Reading | Lower endpoint | Upper endpoint | Publisher note |
|---|---|---|---|---|---|
| Sierra Leone | 2010 | 31.255083364 | 16.619353961 | 63.751125283 | — |
| Sierra Leone | 2011 | 33.649273765 | 17.304193027 | 70.326927768 | — |
| Sierra Leone | 2012 | 36.930075494 | 18.736372506 | 76.442163161 | — |
| Sierra Leone | 2013 | 32.971170086 | 17.153401329 | 66.227656984 | — |
| Sierra Leone | 2014 | 35.361044379 | 18.204066912 | 71.86869979 | — |
| Sierra Leone | 2015 | 38.278505574 | 19.405216029 | 78.679134046 | — |
| Sierra Leone | 2016 | 36.087804805 | 18.464751775 | 74.857698461 | — |
| Sierra Leone | 2017 | 36.304112623 | 18.678563676 | 77.413711455 | — |
| Sierra Leone | 2018 | 35.930956386 | 18.474713776 | 76.617863774 | — |
| Sierra Leone | 2019 | 35.480981184 | 18.610067812 | 74.168729268 | — |
| Sierra Leone | 2020 | 35.988716927 | 18.830694306 | 75.705752805 | — |
| Sierra Leone | 2021 | 34.653442125 | 18.452023475 | 74.03990438 | — |
| Sierra Leone | 2022 | 35.474321858 | 18.689916991 | 74.131123105 | — |
| Sierra Leone | 2023 | 36.90323228 | 19.547655218 | 79.010880107 | — |
One row per country, indicator and year, with raw values, source links and reuse notices. Thresholds have an empty numeric value and separate number/operator fields; value_kind distinguishes upper bounds from absent readings.