Bay Area Air Quality
@AirDistrict
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The Bay Area Air District is the country's first regional air pollution control agency. See our Social Media Policy:
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The Clean HEET Program aims to reduce wintertime wood smoke pollution by incentivizing Bay Area homeowners to replace their existing, operational, freestanding wood stoves or wood-burning fireplace inserts with electric heat pumps.
Learn more and apply:
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We have sent an inspector to the Russian consulate. If they document an excessive smoke violation, they will be cited.
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The orange skies this morning are a result of wildfire smoke in the air. Strong winds over the past few days transported ash from fires in northern California and the Sierra Nevada into the region. (1/2)
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These smoke particles scatter blue light & only allow yellow-orange-red light to reach the surface, causing skies to look orange. If smoke becomes too thick in a certain area, most of the light will be scattered & absorbed before reaching the surface, which may cause dark skies.
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@_Z__
@SpareTheAir
We have sent an inspector to the Russian consulate. If they document an excessive smoke violation, they will be cited.
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Why is the sky now grey instead of orange? The difference today is more water vapor in the air at higher altitudes, changing the way light shines through the smoke particles. When sunlight is scattered through smoke and water vapor, we get grey skies.
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@workthecycle
While vehicle emissions are contributing to air pollution, it is primarily driven by wood smoke pollution, which is the largest source of PM2.5 in the Bay Area during the winter.
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Light overnight winds allowed smoke to seep down from above the shallow marine layer, resulting in widespread Unhealthy & Very Unhealthy conditions. We do not anticipate conditions to improve today, and air quality may degrade as more smoke is expected to mix down to the ground.
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We are asking Bay Area residents to not burn wood in their fireplaces over the Christmas holiday to keep air quality from becoming unhealthy. With your help, we can keep our air clean and enjoy a healthier holiday season. Try viewing a yule log on a streaming service instead!
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A temperature inversion is concentrating air pollution near the ground, leading to elevated PM2.5 levels in parts of the Bay Area from local wood smoke and vehicle emissions as well as pollution from the San Joaquin Valley.
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Large fire at Schnitzer Steel near Port of Oakland producing large column of smoke. AD inspectors are investigating. Plume is expected to travel south this evening and impact AQ in the immediate vicinity and areas downwind. Follow instructions from local health officials.
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@abacon
@workthecycle
While about 4% of Bay Area households use a wood burning-device as their sole source of heat, the 1.4 million fireplaces and woodstoves in the Bay Area are the largest source of air pollution from November to February.
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We've received several inquiries about elevated pollution levels & readings from low-cost sensors over the weekend. While air quality did not exceed federal health standards, the Bay Area is experiencing a strong temperature inversion that can trap pollutants at ground level. 1/3
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A prescribed burn in Novato last week helped cut down on fuels to prepare land for the upcoming wildfire season while training seasonal firefighters who will support crews this summer. Prescribed burns can help curb catastrophic wildfires where smoke can linger for days or weeks.
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From November through February, wood smoke from the 1.4 million fireplaces and woodstoves in the Bay Area is the
#1
source of air pollution, contributing about one-third of the harmful fine particulate pollution in the air. Consider a cleaner way to heat your home this winter!
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⚠️ Air Quality Advisory: Smoke from the
#OakFire
in Mariposa County is forecast to drift into the Bay Area on Monday, 7/25, but smoke is expected to remain aloft. Hazy skies may be visible & the smell of smoke is possible at high elevations. Check the AQI:
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#CleanCarsforAll
is accepting applications! In addition to trading in older, more polluting cars for an
#electricvehicle
, residents can now use the grant for e-bikes for the whole family, plus accessories like helmets and lights! 🚴🚵♀️🚴♂️
Apply today at .
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Why is the sky orange today? Hear the latest air quality update from Air District meteorologist Jarrett Claiborne!
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The Air District is closely monitoring the current incident at the
#Chevron
Refinery in Richmond. Air District inspectors are on scene investigating and we are working to find the root cause of the smoke in addition to any potential air quality violations.
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Today, 9/9, Spare the Air Alert! Bay Area air quality is expected to be Unhealthy for Sensitive Groups in the Northern Zone and the Eastern Zone, Moderate in all other regions.
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The Air District is closely monitoring flaring at
#Chevron
. Inspectors are on scene investigating. We are responding to complaints, documenting any violations of air quality regulations and assisting first responders. Four complaints were received so far. Check back for updates.
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#CleanCarsforAll
is accepting applications for income-qualified residents in areas impacted by higher levels of air pollution.
See if you're eligible to trade in your old, polluting vehicle for an electric vehicle, public transit card or e-bike at ! 🚲⚡️🚙
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Air Quality Advisory: Smoke impacts in the
#BayArea
due to fires in Oregon and Northern California. Air quality impacts are possible throughout the Bay Area. Check the AQI at .
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Pollution data suggests vehicle traffic declined ~70% across the Bay Area. A drop of that magnitude would:
-Cut CO2 emissions by more than 25%
-Cut nitrogen emissions by almost 40%
-Lead to a 20% drop in PM2.5 produced by cars
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After 30 days of
#SparetheAir
Alerts, air quality is expected to be Good to Moderate today and tomorrow. An air quality advisory is in effect through Friday, 9/18 as residual smoke is still aloft and may cause smoky, hazy skies, but air quality is not expected to be unhealthy.
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We have removed the AirNow air quality map from our website due to technical issues that caused incorrect readings. Please see our hourly air quality data for the most up-to-date information here:
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Wildfire safety tips and resources are available here:
#Wildfires
produce toxic
#airpollutants
from known cancer-causing substances & tiny particles that can aggravate existing health problems & increase the risk of heart attack or stroke.
➡️
#SmokeReadyCA
#CAwildfires
#airquality
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Air District delivered 20,000 N95 masks to counties impacted by
#NorthBayFires
incl
#Sonoma
,
#Napa
,
#Solano
&
#Marin
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Today, 8/16, Bay Area air quality is expected to be Moderate in all regions.
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The Air District's Clean Air Filtration Program, the first of its kind, will provide portable air filtration units to unhoused and low-income residents as well as to emergency and cooling centers across the Bay Area to mitigate the potential health impacts of wildfire smoke.
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The
#NorCALZero
Project will deploy 30 hydrogen fuel cell trucks in Northern CA & install a high-capacity hydrogen fueling station near the Port of Oakland!
@Go_CTE
is implementing the project, which was awarded funding from
@AirDistrict
,
@CalEnergy
,
@AirResources
+
@AlamedaCTC
.
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Air Quality Advisory: Air District issued AQ advisory due to smoke impacts from the fire at Schnitzer Steel in W. Oakland. Impacts are expected in parts of the East & South Bay. If you smell smoke, stay indoors w/ windows & doors closed. AQ Advisory: .
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⚠️ Air Quality Advisory: smoke from the Six Rivers Lightning Complex fire is expected to continue to impact the
#BayArea
tomorrow, August 17. Smoky, hazy skies may be visible and the smell of smoke may be present. Air quality is forecast to be in the moderate range tomorrow.
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Today, onshore winds to bring minor air quality improvements to the
#BayArea
. However, air quality is expected to be Unhealthy for Sensitive Groups to Unhealthy. On Sun/Mon: Offshore winds are forecast to bring smoke back into the region and Unhealthy AQ. Wood burning is banned.
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⚠️An air quality advisory for wildfire smoke has been issued through Thursday, 8/31. A Spare the Air Alert is also in effect for today, Wednesday, 8/30. If you smell smoke, avoid exposure.
AQI readings:
Wildfire preparedness tips:
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Due to continued heavy smoke moving into the Bay Area from the
#CampFire
in
#ButteCounty
, the Air District is extending the Winter
@SpareTheAir
Alert through Tuesday, November 20. Follow current air quality here: . Photo in Berkeley on 11-14 via
@BenPaulos
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Smoke Advisory in effect: The Bay Area is experiencing smoke impacts from
#CountyFire
in
#YoloCounty
. Prevailing northerly winds are blowing narrow bands of smoke and ash into the Bay Area. Read more:
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The Air District Board voted today to strengthen building appliance rules to reduce harmful NOx and PM2.5 emissions, protecting public health and air quality. New regulations will phase out NOx-emitting natural gas furnaces and water heaters. Learn more:
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Do you know the difference between sources of air quality data? While the most accurate data comes from the Air District's air monitoring network, low-cost sensors can provide important information about real-time changes in air quality. Learn more:
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This will be the 29th & 30th consecutive
@SpareTheAir
Alert called. For wildfire safety tips, visit .
A Spare the Air Alert has been extended through 9/16. Smoke from wildfires throughout California, Oregon, and Washington is causing unhealthy air quality in the region. Stay indoors with windows & doors closed to protect your health. For more info, visit .
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Taking
@SFBART
to the same place every day for one month emits less CO2 than driving the same route just once, which translates into a car's carbon footprint being about 30 times larger compared to riding the rails!
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⚠️ The Air Quality Advisory has been extended through tomorrow, August 13. Due to active wildfires and changing wind patterns, smoky, hazy skies may be visible and air quality throughout the Bay Area could be impacted.
Check the AQI at .
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A Spare the Air alert & health advisory in effect today thru Sun. in
#BayArea
. Protect your health: .
#NorthBayFires
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⚠️Air Quality Advisory: Smoke is expected to move into the Bay Area today, Wednesday, 8/18, with more widespread impacts than last week. Air quality is expected to be Moderate and is not expected to exceed the health standard.
Check the AQI at
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Air Quality Advisory: Smoke from Northern Calif.
#wildfires
is expected to impact the
#BayArea
through Labor Day. Stay alert to changing conditions and avoid outdoor exposure if the smell of smoke is present. Check the AQI at .
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A
#prescribedburn
was conducted in Mt. Diablo State Park to remove excess fuels & non-native Himalayan blackberry plants. These burns reduce the risk of future wildfires & are only conducted when weather conditions are favorable for smoke dispersion and pollution levels are low.
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Air quality is expected to be in the Unhealthy for Sensitive Groups category for most of Bay Area w/ higher spikes possible. The PurpleAir network can run several times higher than
@AirDistrict
EPA-certified air monitors but provide info about changes in localized smoke impacts.
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Today, the Air District Board of Directors voted to strengthen the Air District's refinery rule to reduce particulate matter emissions from petroleum refineries.
The rule is now the most health-protective & stringent regulation of its kind in the country:
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Wood smoke from residential wood burning is the
#1
source of wintertime air pollution in the Bay Area. Burning wood produces unhealthy fine particulate pollution inside and outside your home. Don't burn wood to protect the health of your family and your neighbors.
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Today, 8/25, and tomorrow, 8/26, Bay Area air quality is expected to be Good in the Coast and Central Bay and the South Central Bay, Moderate in all other regions. See the forecast at .
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When wildfires are affecting air quality, staying indoors with windows and doors shut is the best way to protect your health, if it's not too hot inside. Follow these tips to keep indoor air clean and visit for more on wildfire preparedness.
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See below images reflecting smoke plume forecasts this weekend. Check hourly air quality readings in your region at:
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Today, 9/2, and tomorrow, 9/3, Air Quality Advisory for Smoke! Bay Area air quality is expected to be Moderate in all regions.
Check the AQI at .
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#DYK
using a gas lawn mower for 1 hour emits as much smog-forming pollution as driving 300 miles from LA to Las Vegas in a 2017 Toyota Camry? Using a gas leaf blower for 1 hr creates as much smog-forming pollution as driving that same car from LA to Denver!
Graphic:
@AirResources
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The first and best action you can take to protect your health from
#CampFire
smoke impacts is to stay indoors with windows and doors closed. Follow our wildfire safety tips here:
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Today, 8/17, Bay Area air quality is expected to be Good in all regions.
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Today, 12/19, and tomorrow, 12/20, Spare the Air Alert for wood smoke! Bay Area air quality is expected to be Unhealthy for Sensitive Groups in the Northern Zone and Santa Clara Valley, Moderate in all other regions.
Check the AQI at .
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"We've got to get people out of cars. We've got to make major investments in mass transit & active transportation, and that's going to be my mantra as long as I chair the transportation committee."
-
@laurafriedman43
during Transportation Day at
#COP26
!
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⚠️Air Quality Advisory: smoke from the
#RiverComplex
,
#McFarlandFire
&
#MonumentFire
is expected to impact the North & East Bay causing hazy skies on Thurs, 8/5 and Fri, 8/6. Smoke is aloft and is not expected to cause unhealthy air quality.
Current AQI: .
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Today, 8/30, Air Quality Advisory for Smoke! Bay Area air quality is expected to be Good in the South Central Bay, Moderate in all other regions.
Check the AQI at .
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The
#GlassFire
in the North Bay will continue to impact air quality throughout the region this weekend. Air quality is expected to be in the red (unhealthy for everyone) and orange (unhealthy for sensitive groups) range for the next 5 days. Protect your health by staying indoors.
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Today, 8/24, and tomorrow, 8/25, Spare the Air Alert! Bay Area air quality is expected to be Unhealthy in the Eastern Zone and Santa Clara Valley, Unhealthy For Sensitive Groups in all other regions.
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California’s 1st
#CleanAirCenter
has been launched in San Francisco to offer residents a respite from wildfire smoke during poor air quality! 300+ Clean Air Centers will be available in the Bay Area, 75% of which will benefit vulnerable communities most impacted by air pollution.
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“Climate change shouldn’t be a partisan issue. It shouldn’t be democrat vs. republican. It’s our public health...We have visionaries in CA and can lead the rest of the country in terms of issues like clean air.” -
@SteveKerr
at United Against GHGs -
#DieselFree33
#GCAS2018
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We are asking residents to not burn wood over the Christmas holiday to keep air quality from becoming unhealthy. While we are excited to gather with our loved ones this year, foregoing a fire in the fireplace will protect air quality for our families, friends and neighbors.
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Saturday, 10/26, Bay Area air quality is expected to be Unhealthy for Sensitive Groups in all regions. See updates at .
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If you see or smell smoke due to the
#KincadeFire
, take steps to protect your health. Schools are advised to check out these School Air Quality Activity Recommendations:
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As compliance with air quality permit conditions at Bay Area refineries has declined precipitously in recent years, the Air District is sponsoring
#AB1897
, a bill introduced by Assemblymember
@BuffyWicks
to increase penalties for refinery violations of air quality regulations.
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Today, 9/7, Spare the Air Alert for Ozone and Air Quality Advisory for Smoke! Bay Area air quality is expected to be Unhealthy for Sensitive Groups in Santa Clara Valley, Moderate in all other regions.
Check the AQI at .
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Today is the first day of Air Quality Awareness Week! With wildfire season approaching, now is the time to prepare your home and family for smoke.
For more on
#WildfirePreparedness
, visit
#AQAW2022
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The Air District is closely monitoring smoke from a building fire in San Francisco. Smoke is expected to impact the area near the fire and the East Bay. If you smell smoke, avoid exposure by staying indoors. For air quality readings: .
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This advisory is extended through Wednesday, 7/27. Air quality is expected to remain in the good to moderate range on the AQI. If you can smell smoke, protect your health by staying inside with windows and doors closed, if it's not too hot to do so.
➡️ ⬅️
⚠️ Air Quality Advisory: Smoke from the
#OakFire
in Mariposa County is forecast to drift into the Bay Area on Monday, 7/25, but smoke is expected to remain aloft. Hazy skies may be visible & the smell of smoke is possible at high elevations. Check the AQI:
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Did you know you can make your own air filter at home with a box fan, a MERV filter and some duct tape? Check out this video to learn how.
Special thanks to the
@BrightlineDef
team for collaborating on this
#DIYAirFilter
video!
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Spare the Air alert & continued health advisory 10/12! Learn how to protect your health during
#NorthBayFires
:
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Update: The Air District issued 2 Notices of Violation to Schnitzer Steel for the fire at their facility on August 9. The investigation is still ongoing.
The incident report for the fire at Schnitzer Steel is available now on our website:
We will continue to investigate to determine if there were any violations of air quality regulations. This report will be updated as new information becomes available.
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You may not realize that smoke pollution is a problem during the winter. From November through February, wood smoke is the
#1
source of Bay Area air pollution. While we’re not in wildfire season, wildfire and wood smoke contains
#ParticulateMatter
, which is harmful to our health.
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⚠️ Wildfires in northern California continue to produce smoke which is being transported southward towards the Bay Area and may cause hazy conditions Wednesday, especially in the North Bay. At surface level, onshore winds are expected to keep air quality in the Moderate category.
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Today's air quality is expected to be Unhealthy to Very Unhealthy around the entire Bay Area. A Winter Spare the Air alert is in effect through Tues. Wood burning is banned. Take steps to protect your health:
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Burning wood and lighting fireworks during the New Year’s holiday can cause an unhealthy spike in air pollution and create excess smoke and ash in neighborhoods. Refraining from wood burning & personal fireworks will help Bay Area residents enjoy cleaner air this holiday weekend.
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Happy National Weatherperson's Day! A big thank you to the Air District's meteorologists who put out our daily air quality forecasts!
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Offshore winds are also bringing pollutants from the Central Valley towards the Bay Area. Low-cost sensors do tend to overreport AQI values. Many variables may impact readings that may not be related to air quality such as fog or humidity. 2/3
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An air quality advisory for wildfire smoke has been extended through Saturday, 9/26.
Smoke from the
#AugustComplex
Fire is expected to drift southward into the Bay Area, impacting parts of the East Bay and causing smoky & hazy skies. Air quality is not expected to be unhealthy.
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Today, 8/9, Bay Area air quality is expected to be Moderate in all regions.
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Today, 4/13, and tomorrow, 4/14, Bay Area air quality is expected to be Good in all regions.
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Today, 3/29, and tomorrow, 3/30, Bay Area air quality is expected to be Good in all regions.
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The air quality advisory has been upgraded to a Spare the Air Alert. When wildfires are active, it’s important to stay alert and check air quality conditions to protect your health from smoke. Visit for air quality readings.
A
#SparetheAir
Alert is in effect today, 8/27 & tomorrow, 8/28 due to smoke impacts from California wildfires. Air quality is forecast to be Unhealthy for Sensitive Groups on the
#AirQualityIndex
in most of the Bay Area. Wood burning is banned. See more: .
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Today, the Air District &
@RAMPasthma
alongside
@LibbySchaaf
announced the donation of air filtration units to 2,000 low-income Bay Area residents with uncontrolled asthma through the Home Air Filtration Program to protect their health from air pollution and wildfire smoke.
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To reduce emissions from home appliances, the Air District sponsored
@buildingdecarb
& the creation of the Clean Building Compass, a clearinghouse for local policies that support building decarbonization - including resources for electric cooking! Thread:
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The Air District commends Gov. Newsom's appointment of board member Davina Hurt to the California
@AirResources
Board. Hurt is chair of the Ad Hoc Committee on Equity Access and Inclusion. She is a Belmont city council member, attorney and environmental advocate.
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Air monitoring lab...on wheels! This van uses cutting-edge instrumentation to collect air quality data for a range of air pollutants, including air toxics. Air quality can vary dramatically block to block and the van allows us to measure and document changes across neighborhoods.
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Today, 10/26, and tomorrow, 10/27, Bay Area air quality is expected to be Good in the Eastern Zone and the South Central Bay, Moderate in all other regions.
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7
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Due to increasing frequency of wildfires impacting the Bay Area, the Air District donated high efficiency portable air filtration units and HVAC system filters to the
@RedCross
as part of our Wildfire Air Quality Response Program.
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⚠️ Wildfire smoke is expected to continue to impact the Bay Area through Friday, 8/20.
Northerly winds will transport smoke toward the Bay Area and smoke impacts are forecast to be more widespread than last week. Air quality is expected to be in the mid to high-moderate range.
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Our weekend forecast: Spare the Air Alert! See updates at .
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Air Quality Advisory: smoke from wildfires in Northern California is predicted to impact the Bay Area Friday, 8/27, and Saturday, 8/28. Lofted smoke is expected to cause hazy skies. Check the
#AQI
at .
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@scottgoblue314
@MichaelPetrelis
Yesterday's complaint about the Ferris wheel generator was confirmed by our inspector, who found excessive blue smoke as a result of burning engine oil. The operator is changing out the rental generator for a replacement unit.
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What is particulate matter, or PM2.5? Wood burning is the largest source of PM in the Bay Area during the winter. Learn more about this pollutant and its health effects:
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⚠️ Air Quality Advisory: smoke from the Six Rivers Lightning Complex fire is expected to impact the
#BayArea
tomorrow, 8/23. Smoky, hazy skies may be visible and the smell of smoke may be present. Air quality is not expected to be unhealthy.
Check the AQI:
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