Air Quality Lab — Viljandi, Estonia
Air Quality Profile·
Viljandi reports an annual PM2.5 of 5.9 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
Viljandi
Estonia
EstoniaAnnual Average
GoodWHO annual classification
5.9µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
5.65.6 µg/m³ — Good
6.16.1 µg/m³ — Good
8.08.0 µg/m³ — Good
5.75.7 µg/m³ — Good
5.15.1 µg/m³ — Good
5.95.9 µg/m³ — Good
4.14.1 µg/m³ — Excellent
5.95.9 µg/m³ — Good
5.85.8 µg/m³ — Good
5.75.7 µg/m³ — Good
5.05.0 µg/m³ — Excellent
7.47.4 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
5.65.6 µg/m³ — Good
6.16.1 µg/m³ — Good
8.08.0 µg/m³ — Good
5.75.7 µg/m³ — Good
5.15.1 µg/m³ — Good
5.95.9 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
4.14.1 µg/m³ — Excellent
5.95.9 µg/m³ — Good
5.85.8 µg/m³ — Good
5.75.7 µg/m³ — Good
5.05.0 µg/m³ — Excellent
7.47.4 µg/m³ — Good
Best months: May, Jul, NovWorst months: Feb–Mar, Dec
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 Estonia
Viljandi: 5.9 µg/m³. Typical range in Estonia: 5.5–7.0 µg/m³. Low anchor: Kohtla-Järve, 5.4 µg/m³. High anchor: Tallinn, 7.2 µg/m³.
7 cities tracked