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
San Juan's air quality — share it
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
Air Quality Index Trend
45h · 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 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
Which pollutant is driving the AQI?
PM2.5▲
12.73 µg/m³
PM10
27.45 µg/m³
050100150200300500
What is the weather forecast for San Juan?
Temperature & Precipitation
PM2.5 Trend
45h · 1 stationPM2.512.73 µg/m³
✓ WHO
Moderate
PM1027.45 µg/m³
Good
UV INDEX0.7
Low
Station readings (2 stations within 25 km)
12.73
Median
12.8
Average
12.5
Low
13.1
High
PM2.5 µg/m³ · Model: 16.8 · Bias: +4.1
What is the 7-day forecast for San Juan?
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
Both models agree
Avg diff: 1.9°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 2026-05-29T00:26 UTC.