Air Quality Lab — Nuku‘alofa, Tonga
Air Quality Profile·
Nuku‘alofa reports an annual PM2.5 of 3.7 µg/m³. That's below the WHO 2021 annual guideline of 5 µg/m³ — cleaner than most cities on the continent.
Nuku‘alofa
Tonga
TongaAnnual Average
ExcellentWHO annual classification
3.7µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
5.95.9 µg/m³ — Good
6.06.0 µg/m³ — Good
4.44.4 µg/m³ — Excellent
2.42.4 µg/m³ — Excellent
3.13.1 µg/m³ — Excellent
2.62.6 µg/m³ — Excellent
3.23.2 µg/m³ — Excellent
3.33.3 µg/m³ — Excellent
3.53.5 µg/m³ — Excellent
2.52.5 µg/m³ — Excellent
3.63.6 µg/m³ — Excellent
4.04.0 µg/m³ — Excellent
Jan
Feb
Mar
Apr
May
Jun
5.95.9 µg/m³ — Good
6.06.0 µg/m³ — Good
4.44.4 µg/m³ — Excellent
2.42.4 µg/m³ — Excellent
3.13.1 µg/m³ — Excellent
2.62.6 µg/m³ — Excellent
Jul
Aug
Sep
Oct
Nov
Dec
3.23.2 µg/m³ — Excellent
3.33.3 µg/m³ — Excellent
3.53.5 µg/m³ — Excellent
2.52.5 µg/m³ — Excellent
3.63.6 µg/m³ — Excellent
4.04.0 µg/m³ — Excellent
Best months: Apr, Jun, OctWorst months: Jan–Mar
Excellent0–5 µg/m³Good5–10 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Oceania
Nuku‘alofa: 3.7 µg/m³. Typical range in Oceania: 5.4–6.3 µg/m³. Low anchor: Tarawa, 2.6 µg/m³. High anchor: Port Moresby, 7.8 µg/m³.
165 cities tracked