Air Quality in San Juan, United States
Windy
27.0°C · 82.3% humidity
27.0°
Feels 27.0°
51
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations
Nearby Monitoring Stations
AQI Forecast
27
7pm
34
27
51
10pm
44
39
36
1am
33
32
30
4am
29
29
28
7am
28
28
34
10am
34
34
34
1pm
54
34
34
4pm
34
34
Air Quality Index Trend
46h · 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.
82.3%
Humidity
65.4 km/h
Wind SE
1011.9 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
12.16 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for San Juan?
Temperature & Precipitation
PM2.5 Trend
46h · 1 stationPM2.512.16 µg/m³
✓ WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
Station readings (2 stations within 25 km)
12.16
Median
12.15
Average
12.1
Low
12.2
High
PM2.5 µg/m³ · Model: 7.35 · Bias: -4.8
What is the 7-day forecast for San Juan?
06-09
36.4° 22.1°
0.19 mm
06-10
36.4° 25.5°
06-11
34.8° 25.5°
0.5 mm
06-12
35.6° 24.6°
06-13
34.8° 24.9°
0.13 mm
06-14
36.2° 24.0°
06-15
36.6° 25.6°
Both models agree
Avg diff: 1.5°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 2026-06-09T03:14 UTC.