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

The latest data Last 7 days
Latest air quality data: San Juan
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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 - 11 (Good)
  2. particulate matter (PM10) suspended dust - 56 (Unhealthy for Sensitive Groups)
  3. ozone (O3) - 51 (Good)
  4. nitrogen dioxide (NO2) - 7 (Good)
  5. sulfur dioxide (SO2) - 2 (Good)
  6. carbon monoxide (CO) - 116 (Good)
Real-time Air Quality Index (AQI) for San Juan, Wednesday, August 26, 2026: 3.

air quality index: 2
AQI 3 Unhealthy for Sensitive Groups

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 moderately polluted in San Juan. Healthy people may experience slight irritations and sensitive persons will be slightly affected to a larger extent by the pollutions in San Juan.


What is the current level of PM2.5 in San Juan? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 11 (Good) For comparison, the highest level of PM2.5 in San Juan in the last 7 days was: 20 (Wednesday, August 26, 2026) and the lowest: 7 (Monday, August 24, 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: 56 (Unhealthy for Sensitive Groups)

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

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

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

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



Current data Wednesday, August 26, 2026 at 10:00 PM

PM2,5 11 (Good)

PM10 56 (Unhealthy for Sensitive Groups)

O3 51 (Good)

NO2 7 (Good)

SO2 2 (Good)

CO 116 (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 20
Moderate		 10
Good		 7
Good		 8
Good		 10
Good		 13
Moderate		 16
Moderate		 7
Good
pm10 123
Very Unhealthy		 36
Moderate		 22
Moderate		 50
Unhealthy for Sensitive Groups		 51
Unhealthy for Sensitive Groups		 85
Unhealthy		 99
Unhealthy		 20
Moderate
o3 38
Good		 31
Good		 43
Good		 41
Good		 39
Good		 48
Good		 59
Good		 45
Good
no2 7
Good		 9
Good		 6
Good		 4
Good		 4
Good		 4
Good		 7
Good		 10
Good
so2 2
Good		 2
Good		 2
Good		 1
Good		 1
Good		 1
Good		 2
Good		 2
Good
co 175
Good		 279
Good		 210
Good		 135
Good		 122
Good		 141
Good		 210
Good		 230
Good
data source »

San Juan

Wednesday, August 26, 2026 at 10:00 PM

PM2,5 11 (Good)

particulate matter (PM2.5) dust

PM10 56 (Unhealthy for Sensitive Groups)

particulate matter (PM10) suspended dust

O3 51 (Good)

ozone (O3)

NO2 6.7 (Good)

nitrogen dioxide (NO2)

SO2 1.6 (Good)

sulfur dioxide (SO2)

CO 116 (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 7.1 16 13 10 7.7 7.1 10 20
pm10 20 99 85 51 50 22 36 123
o3 45 59 48 39 41 43 31 38
no2 10 6.8 4.3 3.9 3.8 6 8.6 7.5
so2 2.1 1.5 1.2 1.3 1.2 1.8 1.8 1.6
co 230 210 141 122 135 210 279 175

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

🌦️ Weather · 16-day Forecast — Argentina

🌦️ WEATHER · 16-DAY FORECASTArgentina☁️11°CloudyToday · ↑13° ↓1°💨 8 km/h · 💧 49%Mon24.08☁️13°1°Tue25.08☁️18°9°Wed26.08🌧️16°11°Thu27.08☀️19°8°Fri28.08☁️20°8°Sat29.08🌧️21°8°Sun30.08☁️21°8°Mon31.08🌧️16°10°Tue1.09☁️15°5°Wed2.09☁️15°4°Thu3.09☀️22°9°Fri4.09☁️18°5°Sat5.09🌧️15°8°Sun6.09🌧️20°10°Mon7.09🌧️21°8°Tue8.09🌧️18°11°pollution-alert.com · August 27, 2026

16-day weather forecast for Argentina: today around 13°C (cloudy), lows near 1°C. Daily temperature and conditions, updated every day. Strong wind (about 28 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — Argentina

☀️ UV INDEX · 16-DAY FORECASTArgentina03681111+3.7UV MODERATEtoday, day maxSeek shade around midday. SPF 30+, sunglasses and ahat for longer stays.⏱ Unprotected fair skin can burn in about 55 min4Wed26.085Thu27.085Fri28.085Sat29.085Sun30.085Mon31.084Tue1.095Wed2.095Thu3.095Fri4.094Sat5.095Sun6.095Mon7.093Tue8.095Wed9.093Thu10.090-2 low3-5 moderate6-7 high8-10 very high11+ extremepollution-alert.com · August 27, 2026

The UV index in Argentina today is 3.7 (moderate) — unprotected fair skin can burn in about 55 minutes.

📍 Air quality in nearby cities

Live PM2.5 around San Juan — compare nearby locations.

Frequently asked questions

Is the air safe to breathe in San Juan today?
The current average PM2.5 across San Juan is about 11 µg/m³, rated “Good”. 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 11 µg/m³ (“Good”). 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 20 µg/m³).
What is the UV index in San Juan today?
The UV index in San Juan today is 3.7 (moderate) — unprotected fair skin can burn in about 55 minutes.
Does today's wind help disperse smog in San Juan?
Strong wind (about 28 km/h) is actively clearing smog and dust away.
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.