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Air Quality
Assis · updated at 15:10Air Quality Index · US EPA scale
Unhealthy for sensitive groups
Children, older adults and people with heart or lung disease may have symptoms.
Main pollutantO₃144 µg/m³109
050100150200300+
Temperature31°Humidity33%Wind9 km/h EUV index6
Health recommendations
Unhealthy for sensitive groupsGeneral population
Prefer lighter or shorter outdoor exercise, especially near busy roads.
Sensitive groups
Cut back on intense outdoor activity and take breaks. Keep rescue medication handy.
children, older adults, pregnant women and people with asthma, COPD or heart diseaseOutdoor exerciseReduce
WindowsBetter closed
MaskFor sensitive people
Sensitive groupsStay indoors
Next 24 hours
hourly AQI69O₃17:00
81PM2.518:00
89PM2.519:00
84PM2.520:00
79PM2.521:00
73PM2.522:00
66PM2.523:00
Tomorrow60PM2.500:00
61PM2.501:00
63PM2.502:00
65PM2.503:00
72PM2.504:00
80PM2.505:00
86PM2.506:00
92PM2.507:00
81PM2.508:00
75PM2.509:00
73PM2.510:00
93O₃11:00
104O₃12:00
102O₃13:00
86O₃14:00
64O₃15:00
54PM2.516:00
Worst at 12:00 104Best at 16:00 54
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
Today28/09
33°18°Unhealthy for sensitive groups113max
Today28/0933°18°
33°18°Unhealthy for sensitive groups
113maxHour by hourAQI · PM2.5 · main
00:006215µg/m³PM2.5
01:005813µg/m³PM2.5
02:005712µg/m³PM2.5
03:005713µg/m³PM2.5
04:005913µg/m³PM2.5
05:006115µg/m³PM2.5
06:006316µg/m³PM2.5
07:006014µg/m³PM2.5
08:005712µg/m³PM2.5
09:005712µg/m³PM2.5
10:005712µg/m³PM2.5
11:007112µg/m³O₃
12:009413µg/m³O₃
13:0010613µg/m³O₃
14:0011313µg/m³O₃
15:0010913µg/m³O₃
16:009414µg/m³O₃
17:006914µg/m³O₃
18:008125µg/m³PM2.5
19:008930µg/m³PM2.5
20:008427µg/m³PM2.5
21:007924µg/m³PM2.5
22:007321µg/m³PM2.5
23:006617µg/m³PM2.5
Worst at 14:00Best at 02:00
Tomorrow29/09
35°22°Unhealthy for sensitive groups104max
Tomorrow29/0935°22°
35°22°Unhealthy for sensitive groups
104maxHour by hourAQI · PM2.5 · main
00:006014µg/m³PM2.5
01:006114µg/m³PM2.5
02:006316µg/m³PM2.5
03:006517µg/m³PM2.5
04:007220µg/m³PM2.5
05:008025µg/m³PM2.5
06:008628µg/m³PM2.5
07:009231µg/m³PM2.5
08:008125µg/m³PM2.5
09:007522µg/m³PM2.5
10:007321µg/m³PM2.5
11:009319µg/m³O₃
12:0010416µg/m³O₃
13:0010214µg/m³O₃
14:008612µg/m³O₃
15:006411µg/m³O₃
16:005411µg/m³PM2.5
17:006215µg/m³PM2.5
18:007924µg/m³PM2.5
19:008628µg/m³PM2.5
20:007622µg/m³PM2.5
21:007019µg/m³PM2.5
22:008025µg/m³PM2.5
23:008829µg/m³PM2.5
Worst at 12:00Best at 16:00
Wed30/0934°19°Unhealthy for sensitive groups108max
Wed30/0934°19°
34°19°Unhealthy for sensitive groups
108maxHour by hourAQI · PM2.5 · main
00:009432µg/m³PM2.5
01:0010738µg/m³PM2.5
02:0010838µg/m³PM2.5
03:009131µg/m³PM2.5
04:008326µg/m³PM2.5
05:008427µg/m³PM2.5
06:008829µg/m³PM2.5
07:009130µg/m³PM2.5
08:008025µg/m³PM2.5
09:006919µg/m³PM2.5
10:006416µg/m³PM2.5
11:005914µg/m³PM2.5
12:005712µg/m³PM2.5
13:005611µg/m³O₃
14:005611µg/m³O₃
15:005310µg/m³PM2.5
16:005411µg/m³PM2.5
17:006114µg/m³PM2.5
18:006517µg/m³PM2.5
19:008125µg/m³PM2.5
20:009533µg/m³PM2.5
21:006215µg/m³PM2.5
22:006114µg/m³PM2.5
23:006316µg/m³PM2.5
Worst at 02:00Best at 15:00
Thu01/10
26°19°Moderate69max
Thu01/1026°19°
26°19°Moderate
69maxHour by hourAQI · PM2.5 · main
00:006617µg/m³PM2.5
01:006718µg/m³PM2.5
02:006617µg/m³PM2.5
03:006617µg/m³PM2.5
04:006818µg/m³PM2.5
05:006919µg/m³PM2.5
06:006718µg/m³PM2.5
07:006315µg/m³PM2.5
08:005813µg/m³PM2.5
09:005411µg/m³PM2.5
10:005310µg/m³PM2.5
11:005210µg/m³PM2.5
12:005310µg/m³PM2.5
13:005210µg/m³PM2.5
14:005210µg/m³PM2.5
15:005210µg/m³PM2.5
16:005210µg/m³PM2.5
17:005310µg/m³PM2.5
18:005612µg/m³PM2.5
19:006215µg/m³PM2.5
20:006718µg/m³PM2.5
21:006718µg/m³PM2.5
22:006517µg/m³PM2.5
23:006617µg/m³PM2.5
Worst at 05:00Best at 11:00
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.
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Air quality in Assis (SP)
Air quality in Assis (São Paulo) 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.
