Air Quality in San Juan, United States
Windy
38.5°C · 35.1% humidity
38.5°
Feels 38.5°
75
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations
Nearby Monitoring Stations
San Juan's air quality — share it
AQI Forecast
54
12pm
54
54
75
3pm
69
65
62
6pm
60
58
57
9pm
56
55
55
12am
55
55
54
3am
54
54
54
6am
54
54
54
9am
54
54
Air Quality Index Trend
35h · 1 stnSan 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 1.6× the WHO 24-hour guideline of 15 µg/m³.
35.1%
Humidity
82.5 km/h
Wind SSE
1004.8 hPa
Pressure
29.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
23.52 µg/m³
PM10
27.4 µg/m³
050100150200300500
What is the weather forecast for San Juan?
Temperature & Precipitation
PM2.5 Trend
35h · 1 stationPM2.523.52 µg/m³
×1.6 WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX29.9
Extreme
Station readings (2 stations within 25 km)
23.52
Median
23.05
Average
21.1
Low
25.0
High
PM2.5 µg/m³ · Model: 13.5 · Bias: -10.0
What is the 7-day forecast for San Juan?
07-21
38.5° 26.0°
07-22
37.8° 25.5°
07-23
37.8° 25.2°
1.37 mm
07-24
37.7° 26.9°
07-25
37.0° 26.3°
07-26
38.0° 26.9°
07-27
35.3° 24.7°
6.38 mm
Both models agree
Avg diff: 1.6°C
Where are air quality stations near San Juan?
What cities are near San Juan?
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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 2026-07-21T20:06 UTC.