Air Quality Lab — Cayey, Puerto Rico
Air Quality Profile·
Cayey reports an annual PM2.5 of 9.1 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
Cayey
Puerto Rico
Puerto RicoAnnual Average
GoodWHO annual classification
9.1µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
1010 µg/m³ — Fair
9.49.4 µg/m³ — Good
9.89.8 µg/m³ — Good
9.19.1 µg/m³ — Good
9.39.3 µg/m³ — Good
1010 µg/m³ — Fair
1111 µg/m³ — Fair
9.29.2 µg/m³ — Good
8.28.2 µg/m³ — Good
7.67.6 µg/m³ — Good
8.08.0 µg/m³ — Good
7.47.4 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
1010 µg/m³ — Fair
9.49.4 µg/m³ — Good
9.89.8 µg/m³ — Good
9.19.1 µg/m³ — Good
9.39.3 µg/m³ — Good
1010 µg/m³ — Fair
Jul
Aug
Sep
Oct
Nov
Dec
1111 µg/m³ — Fair
9.29.2 µg/m³ — Good
8.28.2 µg/m³ — Good
7.67.6 µg/m³ — Good
8.08.0 µg/m³ — Good
7.47.4 µg/m³ — Good
Best months: Oct–DecWorst months: Jan, Jun–Jul
Good5–10 µg/m³Fair10–15 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Puerto Rico
Cayey: 9.1 µg/m³. Typical range in Puerto Rico: 7.2–7.8 µg/m³. Low anchor: Guayama, 6.4 µg/m³. High anchor: Bayamón, 8.1 µg/m³.
15 cities tracked