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Air Quality
Colorado · updated at 01:08Air Quality Index · US EPA scale
Unhealthy
Everyone may feel effects; sensitive groups, more serious ones.
Main pollutantPM2.561.5 µg/m³155
050100150200300+
Temperature22°Humidity95%Wind8 km/h WUV index0
Health recommendations
UnhealthyGeneral population
Avoid prolonged outdoor exertion. Keep windows closed during peak hours.
Sensitive groups
Avoid outdoor activity. Seek care if you have shortness of breath or wheezing.
children, older adults, pregnant women and people with asthma, COPD or heart diseaseOutdoor exerciseAvoid
WindowsKeep closed
MaskRecommended
Sensitive groupsStay indoors
Next 24 hours
hourly AQI103PM2.508:00
98PM2.509:00
90PM2.510:00
77PM2.511:00
67PM2.512:00
56PM2.513:00
47PM2.514:00
41PM2.515:00
43PM2.516:00
45PM2.517:00
52PM2.518:00
55PM2.519:00
58PM2.520:00
63PM2.521:00
66PM2.522:00
73PM2.523:00
Tomorrow82PM2.500:00
88PM2.501:00
94PM2.502:00
107PM2.503:00
126PM2.504:00
145PM2.505:00
148PM2.506:00
134PM2.507:00
Worst at 06:00 148Best 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
Today01/10
22°19°Unhealthy171max
Today01/1022°19°
22°19°Unhealthy
171maxHour by hourAQI · PM2.5 · main
00:0015156µg/m³PM2.5
01:0015562µg/m³PM2.5
02:0015968µg/m³PM2.5
03:0016576µg/m³PM2.5
04:0017184µg/m³PM2.5
05:0015865µg/m³PM2.5
06:0012646µg/m³PM2.5
07:0011039µg/m³PM2.5
08:0010336µg/m³PM2.5
09:009834µg/m³PM2.5
10:009030µg/m³PM2.5
11:007723µg/m³PM2.5
12:006718µg/m³PM2.5
13:005612µg/m³PM2.5
14:00479µg/m³PM2.5
15:00417µg/m³PM2.5
16:00438µg/m³PM2.5
17:00458µg/m³PM2.5
18:005210µg/m³PM2.5
19:005511µg/m³PM2.5
20:005813µg/m³PM2.5
21:006315µg/m³PM2.5
22:006617µg/m³PM2.5
23:007321µg/m³PM2.5
Worst at 04:00Best at 15:00
Tomorrow02/10
27°19°Unhealthy for sensitive groups148max
Tomorrow02/1027°19°
27°19°Unhealthy for sensitive groups
148maxHour by hourAQI · PM2.5 · main
00:008226µg/m³PM2.5
01:008829µg/m³PM2.5
02:009432µg/m³PM2.5
03:0010738µg/m³PM2.5
04:0012646µg/m³PM2.5
05:0014553µg/m³PM2.5
06:0014854µg/m³PM2.5
07:0013449µg/m³PM2.5
08:0010638µg/m³PM2.5
09:007522µg/m³PM2.5
10:005813µg/m³PM2.5
11:005210µg/m³PM2.5
12:00519µg/m³O₃
13:00588µg/m³O₃
14:00617µg/m³O₃
15:00587µg/m³O₃
16:00507µg/m³O₃
17:00448µg/m³O₃
18:005813µg/m³PM2.5
19:007421µg/m³PM2.5
20:008829µg/m³PM2.5
21:009432µg/m³PM2.5
22:008930µg/m³PM2.5
23:007924µg/m³PM2.5
Worst at 06:00Best at 17:00
Sat03/1025°17°Moderate72max
Sat03/1025°17°
25°17°Moderate
72maxHour by hourAQI · PM2.5 · main
00:007220µg/m³PM2.5
01:006718µg/m³PM2.5
02:006516µg/m³PM2.5
03:006215µg/m³PM2.5
04:005712µg/m³PM2.5
05:005210µg/m³PM2.5
06:00478µg/m³PM2.5
07:00438µg/m³PM2.5
08:00428µg/m³PM2.5
09:00417µg/m³PM2.5
10:00438µg/m³PM2.5
11:00468µg/m³PM2.5
12:00489µg/m³PM2.5
13:00478µg/m³O₃
14:00487µg/m³O₃
15:00477µg/m³O₃
16:00476µg/m³O₃
17:00456µg/m³O₃
18:00447µg/m³O₃
19:005310µg/m³PM2.5
20:005411µg/m³PM2.5
21:00478µg/m³PM2.5
22:00448µg/m³PM2.5
23:00519µg/m³PM2.5
Worst at 00:00Best at 09:00
Sun04/1023°19°Moderate85max
Sun04/1023°19°
23°19°Moderate
85maxHour by hourAQI · PM2.5 · main
00:005310µg/m³PM2.5
01:00489µg/m³PM2.5
02:00407µg/m³PM2.5
03:00356µg/m³PM2.5
04:00367µg/m³PM2.5
05:00458µg/m³PM2.5
06:00428µg/m³PM2.5
07:00356µg/m³PM2.5
08:00356µg/m³PM2.5
09:00346µg/m³PM2.5
10:00275µg/m³PM2.5
11:00274µg/m³O₃
12:00274µg/m³O₃
13:00295µg/m³O₃
14:00325µg/m³O₃
15:00344µg/m³O₃
16:00344µg/m³O₃
17:00324µg/m³O₃
18:00438µg/m³PM2.5
19:006818µg/m³PM2.5
20:008527µg/m³PM2.5
21:008125µg/m³PM2.5
22:006718µg/m³PM2.5
23:006014µg/m³PM2.5
Worst at 20:00Best 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.
Districts
ColoradoNearby cities
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Air quality in Colorado (PR)
Air quality in Colorado (Paraná) 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.
