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Air Quality
Hercules · updated at 20:56Air Quality Index · US EPA scale
Moderate
Acceptable; unusually sensitive people may notice mild discomfort.
Main pollutantPM2.527.4 µg/m³85
050100150200300+
Temperature17°Humidity58%Wind4 km/h EUV index0
Health recommendations
ModerateGeneral population
Outdoor activities are fine. If you get a cough or eye irritation, take it easier.
Sensitive groups
Very sensitive people should watch for symptoms and slow down if needed.
children, older adults, pregnant women and people with asthma, COPD or heart diseaseOutdoor exerciseGo ahead
WindowsOpen is fine
MaskNot needed
Sensitive groupsWatch symptoms
Next 24 hours
hourly AQI85PM2.520:00
89PM2.521:00
95PM2.522:00
103PM2.523:00
Tomorrow107PM2.500:00
109PM2.501:00
109PM2.502:00
99PM2.503:00
98PM2.504:00
98PM2.505:00
96PM2.506:00
93PM2.507:00
92PM2.508:00
79PM2.509:00
62PM2.510:00
55PM2.511:00
53PM2.512:00
49PM2.513:00
48PM2.514:00
41PM2.515:00
44PM2.516:00
43PM2.517:00
44PM2.518:00
46PM2.519:00
Worst at 01:00 109Best at 15:00 41
Pollutants now
concentration · sub-indexWhat it isPM2.5
Fine particles under 2.5 µm — small enough to reach the lungs and bloodstream. They come from wildfires, diesel engines, industry and smoke, and are the pollutant most linked to heart and lung disease.
WHO 2021 guideline: 15.0 µg/m³ (24-h mean)What it isPM10
Inhalable particles up to 10 µm: road and construction dust, pollen, soot and sea salt. They irritate the nose, throat and airways and worsen asthma and bronchitis.
WHO 2021 guideline: 45.0 µg/m³ (24-h mean)What it isOzone (O₃)
Ground-level ozone forms when sunlight reacts with vehicle and industrial gases. It peaks on hot, sunny afternoons and causes coughing, chest pain and reduced lung function during exercise.
WHO 2021 guideline: 100 µg/m³ (24-h mean)What it isNitrogen dioxide (NO₂)
A gas produced mainly by fuel burning in cars, trucks and power plants. Highest near busy roads. It inflames the airways and increases asthma attacks.
WHO 2021 guideline: 25.0 µg/m³ (24-h mean)What it isSulfur dioxide (SO₂)
A gas released by burning coal and oil in industry, refineries and ships. It irritates the eyes and airways; people with asthma are especially sensitive.
WHO 2021 guideline: 40.0 µg/m³ (24-h mean)What it isCarbon monoxide (CO)
A colourless, odourless gas from incomplete combustion — vehicle exhaust, stoves and fires. It reduces the blood's ability to carry oxygen and is dangerous in enclosed spaces.
WHO 2021 guideline: 4000 µg/m³ (24-h mean)Tap a day to see it hour by hour
Today11/11
21°12°Unhealthy for sensitive groups103max
Today11/1121°12°
21°12°Unhealthy for sensitive groups
103maxHour by hourAQI · PM2.5 · main
00:006718µg/m³PM2.5
01:007120µg/m³PM2.5
02:007522µg/m³PM2.5
03:007924µg/m³PM2.5
04:008829µg/m³PM2.5
05:008326µg/m³PM2.5
06:007924µg/m³PM2.5
07:007824µg/m³PM2.5
08:007723µg/m³PM2.5
09:007522µg/m³PM2.5
10:006718µg/m³PM2.5
11:006114µg/m³PM2.5
12:005914µg/m³PM2.5
13:006215µg/m³PM2.5
14:006416µg/m³PM2.5
15:006416µg/m³PM2.5
16:006718µg/m³PM2.5
17:007924µg/m³PM2.5
18:008729µg/m³PM2.5
19:008628µg/m³PM2.5
20:008527µg/m³PM2.5
21:008929µg/m³PM2.5
22:009533µg/m³PM2.5
23:0010336µg/m³PM2.5
Worst at 23:00Best at 12:00
Tomorrow12/1121°13°Unhealthy for sensitive groups109max
Tomorrow12/1121°13°
21°13°Unhealthy for sensitive groups
109maxHour by hourAQI · PM2.5 · main
00:0010738µg/m³PM2.5
01:0010939µg/m³PM2.5
02:0010939µg/m³PM2.5
03:009935µg/m³PM2.5
04:009835µg/m³PM2.5
05:009835µg/m³PM2.5
06:009633µg/m³PM2.5
07:009332µg/m³PM2.5
08:009231µg/m³PM2.5
09:007924µg/m³PM2.5
10:006215µg/m³PM2.5
11:005511µg/m³PM2.5
12:005310µg/m³PM2.5
13:00499µg/m³PM2.5
14:00489µg/m³PM2.5
15:00417µg/m³PM2.5
16:00448µg/m³PM2.5
17:00438µg/m³PM2.5
18:00448µg/m³PM2.5
19:00468µg/m³PM2.5
20:00479µg/m³PM2.5
21:00479µg/m³PM2.5
22:00489µg/m³PM2.5
23:00458µg/m³PM2.5
Worst at 01:00Best at 15:00
Fri13/11
16°12°Moderate59max
Fri13/1116°12°
16°12°Moderate
59maxHour by hourAQI · PM2.5 · main
00:00407µg/m³PM2.5
01:00367µg/m³PM2.5
02:00326µg/m³PM2.5
03:00305µg/m³O₃
04:00324µg/m³O₃
05:00354µg/m³O₃
06:00394µg/m³O₃
07:00414µg/m³O₃
08:00424µg/m³O₃
09:00425µg/m³O₃
10:00415µg/m³O₃
11:00395µg/m³O₃
12:00384µg/m³O₃
13:00375µg/m³O₃
14:00438µg/m³PM2.5
15:00499µg/m³PM2.5
16:00499µg/m³PM2.5
17:005210µg/m³PM2.5
18:005210µg/m³PM2.5
19:005210µg/m³PM2.5
20:005612µg/m³PM2.5
21:005913µg/m³PM2.5
22:005913µg/m³PM2.5
23:005914µg/m³PM2.5
Worst at 21:00Best at 03:00
Sat14/11
17°10°Moderate77max
Sat14/1117°10°
17°10°Moderate
77maxHour by hourAQI · PM2.5 · main
00:006014µg/m³PM2.5
01:005913µg/m³PM2.5
02:005914µg/m³PM2.5
03:006014µg/m³PM2.5
04:006014µg/m³PM2.5
05:005813µg/m³PM2.5
06:005712µg/m³PM2.5
07:005511µg/m³PM2.5
08:005210µg/m³PM2.5
09:00489µg/m³PM2.5
10:00468µg/m³PM2.5
11:00519µg/m³PM2.5
12:00478µg/m³PM2.5
13:00478µg/m³PM2.5
14:00468µg/m³PM2.5
15:00489µg/m³PM2.5
16:005210µg/m³PM2.5
17:005310µg/m³PM2.5
18:005913µg/m³PM2.5
19:006517µg/m³PM2.5
20:007020µg/m³PM2.5
21:007422µg/m³PM2.5
22:007723µg/m³PM2.5
23:007723µg/m³PM2.5
Worst at 22:00Best at 10:00
Index scale
US EPA · 0 to 5000 – 50
GoodClean air, no risk for anyone.
51 – 100
ModerateAcceptable; unusually sensitive people may notice mild discomfort.
101 – 150
Unhealthy for sensitive groupsChildren, older adults and people with heart or lung disease may have symptoms.
151 – 200
UnhealthyEveryone may feel effects; sensitive groups, more serious ones.
201 – 300
Very unhealthyHealth alert: increased risk for the whole population.
301 – 500
HazardousEmergency: the entire population is likely to be affected.
Index computed with the US EPA method from concentrations modelled by CAMS (Copernicus). These are model estimates, not station measurements; for official data check your local environmental agency (e.g. EPA AirNow).
Nearby counties
CaliforniaNearby cities
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Air quality in Hercules (CA)
Air quality in Hercules (California) with up-to-date data for today, tomorrow and the day after: air quality index (AQI), fine particulate matter PM2.5 and PM10, ozone (O₃), nitrogen dioxide (NO₂), sulfur dioxide (SO₂) and carbon monoxide (CO). Find out whether the air is Good, Moderate, Unhealthy or Hazardous and make safer decisions for outdoor activities.
