Air Quality in San Juan Today — Live AQI, PM2.5 & PM10, Smog, Weather and Forecast

The latest data Last 7 days Quality of life
Latest air quality data: San Juan
Locations: San Juan Carolina » Ponce »
Pollution and air quality forecast for San Juan. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for San Juan:
  1. particulate matter (PM2.5) dust - 14 (Moderate)
  2. particulate matter (PM10) suspended dust - 30 (Moderate)
  3. ozone (O3) - 35 (Good)
  4. nitrogen dioxide (NO2) - 1 (Good)
  5. sulfur dioxide (SO2) - 1 (Good)
  6. carbon monoxide (CO) - 94 (Good)
Real-time Air Quality Index (AQI) for San Juan, Wednesday, August 26, 2026: 2.

air quality index: 1
AQI 2 Moderate

What is the air quality in San Juan today? Is the air polluted in San Juan?. Is there smog?

Today (Wednesday, August 26, 2026) air quality is moderate in San Juan. Some pollutants in San Juan may slightly affect very few hypersensitive individuals. Air pollutants in San Juan may cause minor breathing discomfort to sensitive people.


What is the current level of PM2.5 in San Juan? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 14 (Moderate) For comparison, the highest level of PM2.5 in San Juan in the last 7 days was: 14 (Wednesday, August 26, 2026) and the lowest: 3 (Wednesday, August 19, 2026).

What is the level of PM10 today in San Juan? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in San Juan is: 30 (Moderate)

How is the O3 level today in San Juan? (ozone (O3))
35 (Good)

How high is the level of NO2? (nitrogen dioxide (NO2))
1 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
1 (Good)

How high is the CO level? (carbon monoxide (CO))
94 (Good)



Current data Wednesday, August 26, 2026 at 9:00 PM

PM2,5 14 (Moderate)

PM10 30 (Moderate)

O3 35 (Good)

NO2 1 (Good)

SO2 1 (Good)

CO 94 (Good)

Data on air pollution from recent days in San Juan

index 2026-08-26 2026-08-25 2026-08-24 2026-08-23 2026-08-22 2026-08-21 2026-08-20 2026-08-19
pm25 14
Moderate		 7
Good		 6
Good		 7
Good		 6
Good		 13
Moderate		 12
Good		 3
Good
pm10 36
Moderate		 15
Good		 13
Good		 14
Good		 16
Good		 38
Moderate		 34
Moderate		 5
Good
o3 38
Good		 33
Good		 35
Good		 37
Good		 45
Good		 44
Good		 38
Good		 38
Good
no2 1
Good		 0
Good		 1
Good		 0
Good		 0
Good		 0
Good		 0
Good		 1
Good
so2 0
Good		 1
Good		 0
Good		 0
Good		 0
Good		 0
Good		 1
Good		 1
Good
co 94
Good		 96
Good		 95
Good		 91
Good		 91
Good		 89
Good		 91
Good		 94
Good
data source »

Quality of life in San Juan

Green and Parks in the City

San Juan 41%

Virgin Islands: 68% British Virgin Islands: 38%

Pleasure of spending time in the city

San Juan 62%

Virgin Islands: 89% British Virgin Islands: 38%

Air Pollution

San Juan 37%

Virgin Islands: 0%

Garbage Disposal

San Juan 65%

Virgin Islands: 61% British Virgin Islands: 13%

Availability and quality of drinking water

San Juan 69%

Virgin Islands: 75% British Virgin Islands: 75%

Cleanliness and tidiness

San Juan 45%

Virgin Islands: 64% British Virgin Islands: 13%

Noise and Light pollution

San Juan 58%

Virgin Islands: 14% British Virgin Islands: 75%

Water Pollution

San Juan 54%

Virgin Islands: 14% British Virgin Islands: 75%
Source: Numbeo


San Juan

Wednesday, August 26, 2026 at 9:00 PM

PM2,5 14 (Moderate)

particulate matter (PM2.5) dust

PM10 30 (Moderate)

particulate matter (PM10) suspended dust

O3 35 (Good)

ozone (O3)

NO2 0.7 (Good)

nitrogen dioxide (NO2)

SO2 0.6 (Good)

sulfur dioxide (SO2)

CO 94 (Good)

carbon monoxide (CO)

San Juan

index 2026-08-19 2026-08-20 2026-08-21 2026-08-22 2026-08-23 2026-08-24 2026-08-25 2026-08-26
pm25 2.8 12 13 6.2 7 6.2 7.1 14
pm10 5.5 34 38 16 14 13 15 36
o3 38 38 44 45 37 35 33 38
no2 0.7 0.46 0.38 0.45 0.45 0.51 0.49 0.54
so2 1.3 0.65 0.42 0.35 0.49 0.42 0.91 0.47
co 94 91 89 91 91 95 96 94

* Pollution data source: https://openaq.org () The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — Puerto Rico

🌦️ WEATHER · 16-DAY FORECASTPuerto Rico🌧️26°RainToday · ↑27° ↓21°💨 3 km/h · 💧 74%Mon24.08🌧️27°21°Tue25.08🌧️27°20°Wed26.08🌧️27°20°Thu27.08🌧️27°19°Fri28.08☀️31°19°Sat29.08🌧️31°19°Sun30.08🌧️32°19°Mon31.08🌧️29°19°Tue1.09🌧️29°19°Wed2.09🌧️29°20°Thu3.09🌧️30°19°Fri4.09🌧️29°20°Sat5.09🌧️29°20°Sun6.09🌧️30°19°Mon7.09🌧️29°19°Tue8.09🌧️28°19°pollution-alert.com · August 27, 2026

16-day weather forecast for Puerto Rico: today around 27°C (rain), lows near 21°C. Daily temperature and conditions, updated every day. A moderate breeze (about 10 km/h) is partially dispersing pollutants today.

☀️ UV Index · 16-day Forecast — Puerto Rico

☀️ UV INDEX · 16-DAY FORECASTPuerto Rico03681111+9.2UV VERY HIGHtoday, day maxSPF 50, long sleeves and shade between 10:00-16:00.⏱ Unprotected fair skin can burn in about 20 min9Wed26.086Thu27.089Fri28.089Sat29.089Sun30.086Mon31.083Tue1.097Wed2.096Thu3.099Fri4.099Sat5.096Sun6.099Mon7.099Tue8.097Wed9.099Thu10.090-2 low3-5 moderate6-7 high8-10 very high11+ extremepollution-alert.com · August 27, 2026

The UV index in Puerto Rico today is 9.2 (very high) — unprotected fair skin can burn in about 20 minutes.

Frequently asked questions

Is the air safe to breathe in San Juan today?
The current average PM2.5 across San Juan is about 14 µg/m³, rated “Moderate”. Air quality is good — outdoor activities are fine for everyone.
What is the current PM2.5 level in San Juan?
Right now PM2.5 in San Juan averages about 14 µg/m³ (“Moderate”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.
Which day last week had the worst air in San Juan?
Over the past week, the highest daily PM2.5 in San Juan was recorded on Wednesday, August 26 (about 14 µg/m³).
What is the UV index in San Juan today?
The UV index in San Juan today is 9.2 (very high) — unprotected fair skin can burn in about 20 minutes.
Does today's wind help disperse smog in San Juan?
A moderate breeze (about 10 km/h) is partially dispersing pollutants today.
How is air quality measured?
Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.