Worst air pollution Berkeley - Denver, today and tomorrow
Today (20 September): Air quality in Berkeley is moderate. AQI and NO2 are moderate; PM2.5 and O3 are fair; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (NO2: 43.4/100).
Tomorrow (21 September 2026): Air quality in Berkeley is moderate. All pollutants stay as today. Pollution peaks around 7:00 PM (NO2: 49.1/100). Airmine updates local air quality forecasts four times daily.
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In Berkeley, with vehicle traffic relatively low, dust from nearby fields and occasional burning are the bigger day-to-day factors. Green space in the area offers some natural filtering, softening the local particulate load somewhat. Actual daily readings vary with weather, time of day, and short-term local activity. The surrounding area tends to follow a similar pattern, with only minor local variation.
Today - 20 September | Pollution peaks at 14:00
AQI:
Moderate
43.4/100
PM2.5 (fine particles):
Fair
30.9/100
PM10 (coarse particles):
Good
16.7/100
NO2 (nitrogen dioxide):
Moderate
43.4/100
O3 (ozone):
Fair
30.3/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.3/100
PM1 (ultrafine particles):
Good
6.1/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 19:00
AQI:
Moderate
49.1/100
PM2.5 (fine particles):
Fair
28.5/100
PM10 (coarse particles):
Good
16.3/100
NO2 (nitrogen dioxide):
Moderate
49.1/100
O3 (ozone):
Fair
38.1/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.9/100
PM1 (ultrafine particles):
Good
4.2/100
Other Landmarks in Denver
Sports venues in Denver
Frequently Asked Questions
Is air quality bad in Berkeley right now?
On 20 September 2026, overall air quality in Berkeley is moderate. AQI is the main air quality indicator at 43.4/100. Pollution peaks around 2:00 PM (NO2: 43.4/100).
Will air quality be worse tomorrow in Berkeley?
On 21 September 2026, air quality conditions in Berkeley will be similar to today, with AQI forecast at moderate at 49.1/100. Pollution peaks around 7:00 PM (NO2: 49.1/100).
When is air pollution at its worst in Berkeley?
Wind speeds average only around 14 km/h from October to December, with temperatures near 5°C -- calm, cool conditions that let smoke and particulate matter build up near the ground rather than clear out. From June to August, temperatures average around 21°C, warm enough for strong sun and heat to drive ground-level ozone formation.
Are air quality levels in Berkeley based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 14:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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