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Cities meeting the WHO PM2.5 annual guideline

Published cities whose annual PM2.5 mean is at or below the WHO 2021 guideline of 5 µg/m³. Values come from official measurement networks with the observation date retained.

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Halifax, Canada is first in the current published ranking at 1.9 µg/m³; compare its source date and geographic grain before using the result.

Items compared
30
Countries represented
9
Last checked
2026-07-29

Source-backed answers

Compare each answer with its unit and checked date; the complete source ledger is below.

RankCity or placePublished valueCheckedSource and scope
1Halifax, Canada1.9 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
2Campbell River, Canada1.92 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
3Laramie, United States1.924 µg/m³ug/m32026-07-29
Source Scope: city · Period: 2024-12-31
4Corner Brook, Canada1.95 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
5Charlottetown, Canada2.08 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
6Stratford, Canada2.08 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
7Mountain View, United States2.0967 µg/m³ug/m32026-07-29
Source Scope: city · Period: 2024-12-31
8Pierre, United States2.2028 µg/m³ug/m32026-07-29
Source Scope: city · Period: 2024-12-31
9Alcoutim, Portugal2.7697 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
10Santana, Portugal2.8443 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
11Gällivare, Sweden2.8452 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2023
12Angra do Heroísmo, Portugal2.892 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
13Faro, Portugal2.9058 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
14Krokom, Sweden2.9067 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2023
15Åre, Sweden2.9086 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2023
16Lycksele, Sweden2.918 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2023
17Torsby, Sweden3.0436 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2023
18Rock Springs, United States3.2112 µg/m³ug/m32026-07-29
Source Scope: city · Period: 2024-12-31
19Taos, United States3.3805 µg/m³ug/m32026-07-29
Source Scope: city · Period: 2024-12-31
20Horta, Portugal3.4253 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
21Rovaniemi, Finland3.5 µg/m³ug/m32026-06-12
Source Scope: city · Period: 2024-12-31
22Léglise, Belgium3.5273 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024-12-31
23Saint-Hubert, Belgium3.5735 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024-12-31
24Houffalize, Belgium3.5809 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024-12-31
25Vaux-sur-Sûre, Belgium3.5902 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024-12-31
26Bouillon, Belgium3.6213 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024-12-31
27Brioude, France3.629 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
28Saint-Flour, France3.629 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2024
29Trondheim, Norway3.8466 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2025
30Amble, United Kingdom3.9947 µg/m³ug/m32026-07-15
Source Scope: city · Period: 2025

What the numbers say

  • Halifax, Canada leads at 1.9 µg/m³.
  • Amble, United Kingdom sits at the other end with 3.9947 µg/m³.
  • The middle of this ranking is 2.918 µg/m³, across 30 places that publish the metric.
  • The spread between first and last is 2.0947 µg/m³.

What this measures

Every row is a published pm2.5 — annual mean observation measured in µg/m³, ranked lowest first. The values were observed between 2023 and 2025. A place appears only when it publishes this exact metric, so an absent place means missing data rather than a low value.

  • Compare the displayed value, unit, source date and geographic grain together.
  • A city label does not change a regional observation into a city measurement.
Rows
30 places
Geographic grain
city
Observation period
2023 to 2025
Last checked
2026-07-29
With an official source link
30 of 30

Sources

Official ECCC/NAPS 2024 annual daily-mean station observations, reproducibly aggregated as an arithmetic mean for eligible stations within 25 km of the target city coordinate. This is a derived place observation, not an asserted municipal monitor aggregate.Environment and Climate Change Canada (ECCC), National Air Pollution Surveillance (NAPS) Program · Checked 2026-07-15EPA AQS annual PM2.5 monitor data 2024United States Environmental Protection Agency · Checked 2026-07-29official validated air-quality station bulk; no exact target station-period input foundEuropean Environment Agency · Checked 2026-07-15Official SMHI 2023 national model values are derived from exact-kommun receptor/grid features.SMHI · Checked 2026-07-15Official SMHI 2023 national model values are derived from exact-kommun receptor/grid features.SMHI · Checked 2026-07-15Official SMHI 2023 national model values are derived from exact-kommun receptor/grid features.SMHI · Checked 2026-07-15Official SMHI 2023 national model values are derived from exact-kommun receptor/grid features.SMHI · Checked 2026-07-15Official SMHI 2023 national model values are derived from exact-kommun receptor/grid features.SMHI · Checked 2026-07-15SYKE — Environment InstituteSYKE — Environment Institute · Checked 2026-06-12Official RIO v2025 annual mean derived from daily population-weighted municipality concentrations for NIS5 62093; period 2024-01-01..2024-12-31IRCELINE/CELINE · Checked 2026-07-152024 validated hourly NO2 station observations transformed to the exact INSEE commune centre by deterministic nearest-station selection and equal-weight aggregation.EEA Air Quality e-Reporting / France reporting via LCSQA · Checked 2026-07-15Official PM2.5 2025 calendar-year station aggregate for exact in-kommune background station input(s).Miljødirektoratet — Luftkvalitet i Norge · Checked 2026-07-15