Berkeley Real-Time AQI Tracker
Get Alerts For Unhealthy AQI In Your Area
When air quality in your area reaches unhealthy levels, we'll send you a quick alert, along with expert tips on how to reduce your exposure.
What's Actually In Berkeley Air Today?
What High AQI Means for Your Lungs in Berkeley
How to Read AQI
The Air Quality Index (AQI) measures how polluted the air is and how it may affect your health.
0–50 (Good): Air quality is satisfactory.
51–100 (Moderate): Acceptable, but some pollutants may pose minor concerns.
101–150 (Unhealthy for Sensitive Groups)
151–200 (Unhealthy)
201–300 (Very Unhealthy)
301+ (Hazardous)
Moderate
Still okay for most, but if you have asthma or allergies, take it easy and avoid long outdoor workouts.
Shop MERV 11 filters→What's the Right Filter for Your AQI Level?
Check Today's Live Real Time Air Quality Index AQI Map in Berkeley, CA Now
TL;DR
Filterbuy's live map above shows Berkeley's real-time air quality index (AQI). Sea breezes keep the air clean most days; the risk comes from winter wood smoke and wildfire smoke from late summer into fall. When the map reaches AQI 100, our action line, close up the house and upgrade your filtration.
Key Takeaways
Fine particles (PM2.5) drive most Berkeley AQI readings; sea breezes carry ozone inland.
Wood smoke causes roughly one-third of Bay Area fine particle pollution on cold, still winter days, per the Bay Area Air District.
A map that stays Yellow for days means PM2.5 above the level of the EPA's annual health standard.
Reading Berkeley's Live AQI Map: What to Check First
At Filterbuy, we read Berkeley's map in three checks: the current AQI number, then the pollutant driving it, then the hourly trend. When PM2.5 leads, as it almost always does here, filtration helps most; when ozone leads on a rare hot day, timing your plans matters more. A climbing trend means close the windows now.
Search by ZIP code, or compare Berkeley with the live Oakland air quality map or the California air quality map.
Berkeley AQI Levels Explained, with What to Do at Each
The AQI scale runs from 0 to 500, with categories and colors set by the U.S. Environmental Protection Agency (EPA). Since 2024, a 24-hour PM2.5 level of 35.4 micrograms per cubic meter tops the Moderate band, per the EPA's 2024 AQI fact sheet.
Categories and colors: EPA. Sources: EPA 2024 PM2.5 AQI fact sheet; Berkeleyside, November 16, 2018.
Filterbuy acts at AQI 100, the top of Moderate: put a MERV 13 filter in the HVAC, set the thermostat fan to On, run a portable HEPA air cleaner in each occupied room and close up the house. A Yellow week matters too, since the EPA set the Good-to-Moderate line at 9.0 micrograms per cubic meter to match its annual PM2.5 standard; use it to get MERV 13 in place.
When the Sky and Berkeley's AQI Disagree
Filterbuy's rule when the map and the window disagree: act on the smoke you see or smell. Two things explain the gap.
Smoke aloft: On September 9, 2020, skies glowed orange while ground readings stayed lower, because the smoke sat above the marine layer, the San Francisco Chronicle reported.
Monitor distance: The Air District's regulatory monitor sits at Aquatic Park beside Interstate 80, so hill homes can read differently; check nearby sensors on the AirNow Fire and Smoke Map.
Is It Safe to Breathe the Air in Berkeley Right Now?
For most people, Berkeley's air is safe at Green or Yellow (AQI 0–100). At Orange (101–150), children, older adults, pregnant people, and anyone with heart disease or lung conditions such as asthma or COPD should move strenuous activity indoors; at Red (151 and above), everyone should cut back. This follows EPA health messages; people with heart or lung conditions should also follow their doctor's advice. See Filterbuy's guide on what to do when the AQI tops 100.
Berkeley Air Forecasts and Spare the Air Alerts
The Bay Area Air District issues next-day forecasts and Spare the Air Alerts for Berkeley through Spare the Air text alerts and 1-800-HELP-AIR.
Particle alerts carry legal force: the Air District's Wood Burning Rule bans burning wood, pellets included, on any alert day, per the Air District's wood smoke FAQ. Gas fireplaces and outdoor grills are exempt; summer ozone alerts carry no ban.
Wood smoke builds after dark as cold air settles over the flats, so on alert days, air out the house in early afternoon and close up by dusk.
How Air Quality Shifts Across Berkeley Neighborhoods
Block to block, Berkeley's air depends mostly on distance from Interstate 80 and on nearby wood burning in winter.
Based on roads and land use.
West Berkeley homes beside I-80 fit a pattern our founder describes:
After manufacturing filters for over a decade and serving more than two million households, we consistently see the same pattern: homes near highways and industrial corridors need a higher MERV rating than the national average recommendation, and MERV 13 is where most of those households land.
David Heacock, Founder and CEO, Filterbuy, in PM10 vs. PM2.5
What's in Berkeley's Air, and How It Compares
PM2.5, fine particles small enough to reach deep into the lungs, is the part of Berkeley's air pollution that matters most. It comes mostly from wood burning and wildfire smoke, plus I-80 traffic.
Ozone forms when sunlight reacts with exhaust, and the sea breeze carries it east, so Bay Area ozone peaks land in the Tri-Valley and eastern Contra Costa County. Ozone breaks down quickly indoors while fine particles linger, which is why Filterbuy puts particle filtration first here.
Berkeley's metro ranked 14th worst for ozone in the American Lung Association's "State of the Air" 2026 report. See Filterbuy's ranking of the worst air quality cities in the U.S. or the San Francisco air quality map.
Wildfire Smoke in Berkeley: What 2018 and 2020 Taught the East Bay
Wildfire smoke is Berkeley's most serious air threat. In November 2018, Camp Fire smoke pushed the Aquatic Park monitor to AQI 247 and UC Berkeley canceled classes, Berkeleyside reported.
Track fires on the Berkeley wildfire and smoke map or the California wildfire and smoke map, and follow AirNow and Air District instructions first. At AQI 100, take these steps from Filterbuy's wildfire smoke and AQI guide:
1. Put a MERV 13 filter in the HVAC system.
2. Switch the thermostat fan from Auto to On.
3. Run a portable HEPA air cleaner in each occupied room, bedrooms first.
4. Close up the house and set any window air conditioner to recirculate. Skip candles, frying, smoking and non-HEPA vacuuming.
Check the filter often during smoke and replace it when it looks dark brown or black, which can be sooner than the label says, per the EPA's smoke guidance. Keep a spare. Outdoors, wear a fitted N95; the City of Berkeley warns bandanas and dust masks do not stop smoke.
No Central HVAC? Clean Air for Berkeley's Older Homes
Many older Berkeley homes heat with a floor furnace or wall heater and have no ducts or filter slot. For them, a portable HEPA air cleaner is the primary defense, even though Filterbuy does not sell one. HEPA never goes in a furnace slot; see our HEPA vs. MERV 13 comparison. Size it with the EPA's cleaner air room guidance: a smoke CADR (clean air delivery rate) of at least two-thirds of the room's square footage, or roughly 100 for a 150-square-foot bedroom. As our reviewer notes:
A purifier sized for a bedroom gets placed in an open-plan living area, and the owner concludes the technology failed.
David Clark, Licensed HVAC Technician, in Air Purifier vs. HVAC Filter
Skip ionizers and ozone generators; the EPA advises against air cleaners that produce ozone. A box fan with a MERV 13 filter taped to it is a reasonable stopgap, not a replacement for a certified unit; per the EPA, use a fan built in 2012 or later and never run it unattended. Alameda County lists clean air centers for severe smoke.
Our Take: What Filterbuy Sees in Berkeley's Air
Filterbuy reads Berkeley's air by season, since its bad-air days come in waves:
November to February: Spare the Air season, when wood smoke pools on still nights.
Spring and early summer: sea breezes usually keep Berkeley clean while ozone peaks inland.
August to November: wildfire smoke season, often pushed west by Diablo winds.
In Berkeley's mild climate, central systems often sit idle for weeks, and a filter does nothing until the fan runs. Install a MERV 13 filter and test the fan before August, with a spare on hand. Michelle Wan frames it this way:
The question I get most often is which one to buy. The question that actually decides it is what is coming at your house.
Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy, in Air Purifier vs. HVAC Filter
Which Filter Berkeley's AQI Level Calls For
Filterbuy's guidance switches to MERV 13 at AQI 100. A MERV 8 air filter covers Berkeley's clean days and a MERV 11 air filter suits allergy households. For smoke from wildfires or wood burning, our tier is a MERV 13 air filter.
Per the EPA, most furnaces and HVAC systems can use MERV 13 without equipment problems if the filter is replaced often. Choose it in your usual size.
Supporting Statistics
1. 30 straight Spare the Air Alerts in 2020
The Bay Area Air District called 30 smoke alerts in a row by mid-September 2020.
2. 29% to 68% less indoor PM2.5
Portable HEPA air cleaners cut indoor PM2.5 by this range in CDC-reviewed studies.
The 68% result came from homes with wood stove smoke.
Source: CDC, Indoor Air Filtration for Wildfire Smoke (2020)
3. 90% of time spent indoors
Americans spend about 90% of their time inside.
Some indoor pollutants run 2 to 5 times higher than outdoors.
Source: U.S. EPA, Indoor Air Quality
Frequently Asked Questions
What Is the Air Quality in Berkeley Today?
Filterbuy's live map at the top of this page shows Berkeley's real-time AQI and the pollutant driving it.
Why Can't I Burn Wood in My Fireplace Tonight?
Burning wood is illegal in Berkeley on any Spare the Air Alert day for fine particles.
Is the Air Quality Bad in Berkeley Today?
At AQI 100 or lower, most people can be active outside as usual. Above 100, sensitive groups should exercise indoors; above 150, everyone should. PM2.5 usually drives Berkeley's high readings.
How Do I Get Air Quality Alerts for Berkeley?
Use the Filterbuy alert signup on this page or the Bay Area Air District's Spare the Air text alerts.
What MERV Rating Do I Need for Wildfire Smoke in Berkeley?
MERV 13 in your usual size, with the fan set to On and a portable HEPA air cleaner in each occupied room. Homes without ducts rely on portable HEPA units.
Glossary
Filterbuy: American maker of MERV-rated HVAC filters and publisher of this AQI map.
AQI (Air Quality Index): The EPA's 0–500 daily air pollution scale.
PM2.5: Fine particles 2.5 micrometers or smaller, the main smoke pollutant.
Bay Area Air District: Regional air regulator, formally the Bay Area Air Quality Management District.
Diablo winds: Dry offshore winds that raise fire risk.
MERV: Minimum Efficiency Reporting Value, a 1–16 filter rating.
CADR: Clean air delivery rate, how fast a purifier cleans a room.
HEPA: High-efficiency particulate air; used in portable air cleaners, never furnaces.