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

The latest data Last 7 days
Latest air quality data: San Diego
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Pollution and air quality forecast for San Diego. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for San Diego:
  1. particulate matter (PM2.5) dust - 28 (Moderate)
  2. particulate matter (PM10) suspended dust - 35 (Moderate)
  3. ozone (O3) - 98 (Moderate)
  4. nitrogen dioxide (NO2) - 13 (Good)
  5. sulfur dioxide (SO2) - 1 (Good)
  6. carbon monoxide (CO) - 173 (Good)
Real-time Air Quality Index (AQI) for San Diego, Wednesday, August 26, 2026: 2.

air quality index: 1
AQI 2 Moderate

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

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


What is the current level of PM2.5 in San Diego? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 28 (Moderate) For comparison, the highest level of PM2.5 in San Diego in the last 7 days was: 27 (Wednesday, August 26, 2026) and the lowest: 15 (Friday, August 21, 2026).

What is the level of PM10 today in San Diego? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in San Diego is: 35 (Moderate)

How is the O3 level today in San Diego? (ozone (O3))
98 (Moderate)

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

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

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



Current data Wednesday, August 26, 2026 at 6:00 PM

PM2,5 28 (Moderate)

PM10 35 (Moderate)

O3 98 (Moderate)

NO2 13 (Good)

SO2 1 (Good)

CO 173 (Good)

Data on air pollution from recent days in San Diego

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 27
Moderate		 21
Moderate		 21
Moderate		 19
Moderate		 16
Moderate		 15
Moderate		 15
Moderate		 15
Moderate
pm10 32
Moderate		 25
Moderate		 26
Moderate		 23
Moderate		 20
Moderate		 20
Moderate		 21
Moderate		 20
Moderate
o3 51
Good		 47
Good		 42
Good		 44
Good		 48
Good		 42
Good		 53
Good		 59
Good
no2 34
Good		 29
Good		 26
Good		 26
Good		 26
Good		 26
Good		 21
Good		 22
Good
so2 2
Good		 2
Good		 1
Good		 1
Good		 1
Good		 1
Good		 1
Good		 1
Good
co 220
Good		 157
Good		 129
Good		 124
Good		 144
Good		 159
Good		 136
Good		 119
Good
data source »

San Diego

Wednesday, August 26, 2026 at 6:00 PM

PM2,5 28 (Moderate)

particulate matter (PM2.5) dust

PM10 35 (Moderate)

particulate matter (PM10) suspended dust

O3 98 (Moderate)

ozone (O3)

NO2 13 (Good)

nitrogen dioxide (NO2)

SO2 1.4 (Good)

sulfur dioxide (SO2)

CO 173 (Good)

carbon monoxide (CO)

San Diego

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 15 15 15 16 19 21 21 27
pm10 20 21 20 20 23 26 25 32
o3 59 53 42 48 44 42 47 51
no2 22 21 26 26 26 26 29 34
so2 1.3 1 1.3 1.3 1.5 1.4 1.5 1.8
co 119 136 159 144 124 129 157 220

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

🌦️ Weather · 16-day Forecast — Mexico

🌦️ WEATHER · 16-DAY FORECASTMexico🌧️27°RainToday · ↑29° ↓26°💨 6 km/h · 💧 80%Tue25.08🌧️29°26°Wed26.08🌧️31°26°Thu27.08🌧️30°25°Fri28.08🌧️27°24°Sat29.08🌧️26°24°Sun30.08🌧️27°25°Mon31.08🌧️26°26°Tue1.09🌧️28°26°Wed2.09🌧️29°25°Thu3.09🌧️29°24°Fri4.09🌧️28°25°Sat5.09🌧️29°25°Sun6.09🌧️31°25°Mon7.09☁️31°24°Tue8.09🌧️29°24°Wed9.09🌧️25°24°pollution-alert.com · August 27, 2026

16-day weather forecast for Mexico: today around 29°C (rain), lows near 26°C. Daily temperature and conditions, updated every day. Strong wind (about 22 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — Mexico

☀️ UV INDEX · 16-DAY FORECASTMexico03681111+7.8UV HIGHtoday, day maxSPF 30-50, hat and sunglasses are a must. Better tostay in the shade 11:00-15:00.⏱ Unprotected fair skin can burn in about 25 min8Wed26.089Thu27.083Fri28.081Sat29.081Sun30.082Mon31.086Tue1.096Wed2.097Thu3.091Fri4.097Sat5.093Sun6.094Mon7.099Tue8.092Wed9.094Thu10.090-2 low3-5 moderate6-7 high8-10 very high11+ extremepollution-alert.com · August 27, 2026

The UV index in Mexico today is 7.8 (high) — unprotected fair skin can burn in about 25 minutes.

📍 Air quality in nearby cities

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

Frequently asked questions

Is the air safe to breathe in San Diego today?
The current average PM2.5 across San Diego is about 28 µg/m³, rated “Moderate”. Air quality is acceptable, but unusually sensitive people should limit prolonged outdoor exertion.
What is the current PM2.5 level in San Diego?
Right now PM2.5 in San Diego averages about 28 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 Diego?
Over the past week, the highest daily PM2.5 in San Diego was recorded on Wednesday, August 26 (about 27 µg/m³).
What is the UV index in San Diego today?
The UV index in San Diego today is 7.8 (high) — unprotected fair skin can burn in about 25 minutes.
Does today's wind help disperse smog in San Diego?
Strong wind (about 22 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.