San Jose: Air Pollution Today — AQI Index, PM2.5/PM10, Smog Alerts and Forecast

Pollution and air quality forecast for San Jose. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for San Jose:

1. particulate matter (PM2.5) dust - 8 (Good)
2. particulate matter (PM10) suspended dust - 10 (Good)
3. ozone (O3) - 82 (Moderate)
4. nitrogen dioxide (NO2) - 4 (Good)
5. sulfur dioxide (SO2) - 1 (Good)
6. carbon monoxide (CO) - 111 (Good)

Real-time Air Quality Index (AQI) for San Jose, Wednesday, August 26, 2026: 2.

What is the current level of PM2.5 in San Jose? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 8 (Good) For comparison, the highest level of PM2.5 in San Jose in the last 7 days was: 12 (Wednesday, August 19, 2026) and the lowest: 7 (Saturday, August 22, 2026).

What is the level of PM10 today in San Jose? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in San Jose is: 10 (Good)

How is the O3 level today in San Jose? (ozone (O3))
82 (Moderate)

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

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

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

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

San Jose

Wednesday, August 26, 2026 at 6:00 PM

🌦️ Weather · 16-day Forecast — United States

16-day weather forecast for United States: today around 30°C (rain), lows near 19°C. Daily temperature and conditions, updated every day. Strong wind (about 25 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — United States

The UV index in United States today is 7.3 (high) — unprotected fair skin can burn in about 25 minutes.

📍 Air quality in nearby cities

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

• New York City 20 µg/m³
• Los Angeles 30 µg/m³
• Chicago 10 µg/m³
• Houston 15 µg/m³
• Philadelphia 12 µg/m³
• Phoenix 7 µg/m³
• Bronx 20 µg/m³
• San Antonio 12 µg/m³

Frequently asked questions

Is the air safe to breathe in San Jose today?

The current average PM2.5 across San Jose is about 8 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in San Jose?

Right now PM2.5 in San Jose averages about 8 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 Jose?

Over the past week, the highest daily PM2.5 in San Jose was recorded on Wednesday, August 19 (about 12 µg/m³).

What is the UV index in San Jose today?

The UV index in San Jose today is 7.3 (high) — unprotected fair skin can burn in about 25 minutes.

Does today's wind help disperse smog in San Jose?

Strong wind (about 25 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.