Air Quality in San Juan, United States

Windy
29.2°C · 56.5% humidity
29.2°
Feels 32.8°
52
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast
34 4pm
34
27
52 7pm
45
38
34 10pm
32
32
30 1am
29
29
28 4am
28
28
27 7am
34
34
27 10am
27
27
27 1pm
27
27
AD 728×90

Air Quality Index Trend

45h · 1 stn

San Juan's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in San Juan is 2.5× the WHO annual guideline of 5 µg/m³.

56.5%
Humidity
98.1 km/h
Wind SE
1006.6 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
PM2.5
52
12.73 µg/m³
PM10
25
27.45 µg/m³
050100150200300500

Temperature & Precipitation

PM2.5 Trend

45h · 1 station
PM2.512.73 µg/m³ ✓ WHO
Moderate
PM1027.45 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
12.73
Median
12.8
Average
12.5
Low
13.1
High
PM2.5 µg/m³ · Model: 16.8 · Bias: +4.1
05-29
33.8° 24.1°
0.81 mm
05-30
31.9° 23.1°
0.06 mm
05-31
33.3° 22.4°
0.06 mm
06-01
36.1° 23.8°
06-02
33.5° 23.5°
06-03
33.6° 23.9°
06-04
33.4° 23.9°
0.13 mm
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-29T00:26 UTC.