What the Pleasant Hill STAR Smog Program Does
Pleasant Hill's STAR (Spare the Air) smog program is a real-time alert system that tells you when air pollution reaches unhealthy levels in your area. When smog conditions worsen, STAR sends notifications and recommends which activities to avoid — not because you must follow them, but because the information helps you make decisions about your own health and your family's.
The program runs during California's smog season, typically May through October, though the exact dates shift year to year. STAR monitors ozone and particulate matter (the two main pollutants that make up smog) and issues alerts when either reaches levels that can affect breathing, especially for children, older adults, and people with asthma or heart conditions.
Key Takeaways
- STAR alerts are issued by the Bay Area Air Quality Management District (BAAQMD) and sent through multiple channels — text, email, phone, and the BAAQMD website — so you can choose how you receive them.
- You sign up for alerts through the BAAQMD website or by calling their phone line; Pleasant Hill residents can also check conditions through the city's website or local news.
- Alert levels range from "Unhealthy for Sensitive Groups" (affecting children and people with respiratory conditions) to "Unhealthy" and "Very Unhealthy" (affecting the general population).
- When an alert is issued, BAAQMD recommends specific actions like reducing outdoor exercise, keeping windows closed, or using air filters — but these are suggestions based on your own health needs, not requirements.
How to Sign Up for STAR Alerts
The main way to receive Pleasant Hill smog alerts is through the Bay Area Air Quality Management District's alert system. Go to the BAAQMD website (baaqmd.gov) and look for the "Alerts" or "Sign Up for Alerts" section. You will enter your zip code (94523 for Pleasant Hill) and choose how you want to be notified: text message, email, or phone call.
If you do not have internet access or prefer to sign up by phone, call the BAAQMD directly. They can add your phone number or email to the system over the phone. You can also check current air quality conditions on their website without signing up — the real-time map shows pollution levels for Pleasant Hill and surrounding areas updated throughout the day.
Some residents also receive alerts through the City of Pleasant Hill's website or local news stations, which republish BAAQMD information. However, signing up directly with BAAQMD ensures you get alerts as soon as they are issued, rather than waiting for a news broadcast.
Understanding Alert Levels and What They Mean
BAAQMD uses a color-coded system that matches the national Air Quality Index (AQI). Each level describes who is most at risk and what the air quality means for outdoor activity.
| Alert Level | Who It Affects Most | What BAAQMD Recommends |
|---|---|---|
| Unhealthy for Sensitive Groups | Children, older adults, people with asthma or heart disease | Sensitive groups should limit outdoor activity; others can be active normally |
| Unhealthy | Sensitive groups and some members of the general population | Sensitive groups should avoid outdoor activity; others should limit it |
| Very Unhealthy | Most people, including those without health conditions | Everyone should avoid outdoor activity; stay indoors with windows closed |
| Hazardous | Everyone | Avoid all outdoor activity; use air filters indoors if possible |
These recommendations are based on health research, but they are not one-size-fits-all. A person with severe asthma might need to stay indoors at "Unhealthy for Sensitive Groups," while someone without respiratory conditions might feel fine exercising outdoors at the same level. The alert tells you what the air contains; you decide what to do based on your own health.
What to Do When a STAR Alert Is Issued
When you receive an alert, read the level and the specific recommendations. If you are in a sensitive group (children under 14, adults over 65, or anyone with asthma, heart disease, or other chronic respiratory conditions), take the recommendations seriously — these groups experience real health effects from smog exposure.
If you are not in a sensitive group, you have more flexibility, but the alert is still useful information. Some people choose to reschedule outdoor exercise, close windows and use air conditioning, or wear an N95 mask if they must be outside. Others decide the risk is acceptable for their situation. The alert gives you the data; you make the choice.
For parents and caregivers, an alert means checking with schools or daycare centers about whether outdoor activities (recess, sports practice, field trips) will be moved indoors or postponed. Many schools in the Bay Area have their own smog policies and may cancel outdoor events when alerts reach certain levels.
Checking Air Quality Between Alerts
You do not have to wait for an alert to check Pleasant Hill's air quality. The BAAQMD website has a real-time map showing current AQI readings for your area, updated hourly during the day. You can also use third-party apps like AirNow (run by the EPA) or IQAir, which pull data from the same monitoring stations and show forecasts for the next few days.
If you see the AQI climbing toward unhealthy levels but have not received an alert yet, you can take early action — close windows, plan indoor activities, or prepare masks. This is especially useful if you are planning a weekend trip or outdoor event and want to know what conditions might be like.
The BAAQMD also publishes a weekly forecast during smog season, usually on Thursdays, predicting whether unhealthy air is expected in the coming week. This helps you plan ahead rather than react to alerts at the last minute.
Why Pleasant Hill Gets Smog Alerts
Pleasant Hill sits in the San Francisco Bay Area's inland valleys, where smog forms when sunlight heats up pollutants from cars, refineries, and other sources. The geography traps this pollution — mountains to the west block ocean breezes that would normally clear the air — so smog builds up on hot, still days, especially in late summer.
The Bay Area does not meet federal air quality standards every year, which is why BAAQMD runs the STAR program. The alerts are part of a larger effort to reduce pollution and help people protect their health on bad air days. Over the past two decades, air quality has improved significantly, but smog remains a seasonal concern, particularly for sensitive groups.
Frequently Asked Questions
Do I have to follow the recommendations in a STAR alert?
No. STAR alerts are informational — they tell you what the air quality is and who is most at risk, but you decide what to do. If you are not in a sensitive group and feel comfortable exercising outdoors during an "Unhealthy for Sensitive Groups" alert, that is your choice. However, if you are in a sensitive group, the recommendations are based on health research and worth taking seriously.
Will my school close because of a smog alert?
Schools do not automatically close for smog alerts, but many modify outdoor activities. Some cancel recess or sports practice, move them indoors, or reschedule field trips. Check with your school's website or call the district office to find out their smog policy — most post it during the spring before smog season starts.
Can I get alerts on my phone if I do not have a smartphone?
Yes. BAAQMD sends alerts by text message to any phone that can receive texts, and also by phone call (an automated message reads the alert to you). You can also check conditions anytime by calling their information line or visiting their website on a computer.
What if I think the air quality reading is wrong?
BAAQMD monitors air quality at several stations across the Bay Area, and readings can vary by neighborhood. If you think a reading does not match what you are experiencing, you can report it to BAAQMD through their website. They use this feedback to maintain their equipment and improve accuracy.
Does the STAR program run year-round?
No. STAR typically runs from May through October, when warm weather creates conditions for smog formation. Outside these months, air quality is usually better, and alerts are rare. However, you can still check real-time air quality on the BAAQMD website anytime.