Boulder AQI History

Hourly air quality data for the past 24 hours in Boulder, Colorado.

24-Hour Summary

Average AQI

Peak AQI

Best AQI

Hourly AQI Data

TimeAQICategoryPM2.5PM10
06:00 am————
05:00 am————
04:00 am————
03:00 am52Moderate9.431.0
02:00 am————
01:00 am35Good6.335.4
12:00 am35Good6.226.5
11:00 pm39Good7.033.9
10:00 pm41Good7.244.4
09:00 pm38Good6.828.5
08:00 pm36Good6.522.7
07:00 pm36Good6.625.4
06:00 pm35Good6.334.4
05:00 pm35Good6.324.3
04:00 pm38Good6.828.3
03:00 pm37Good6.620.1
02:00 pm29Good5.214.9
01:00 pm30Good5.313.8
12:00 pm29Good5.312.7
11:00 am32Good5.713.8
10:00 am33Good6.015.0
09:00 am32Good5.814.0
08:00 am35Good6.314.9
07:00 am37Good6.716.9
06:00 am41Good7.318.9
05:00 am44Good7.925.6
04:00 am44Good7.926.0
03:00 am43Good7.728.6
02:00 am40Good7.224.7
01:00 am42Good7.624.6
12:00 am41Good7.328.4
11:00 pm40Good7.124.4
10:00 pm38Good6.932.5
09:00 pm41Good7.427.7
08:00 pm————
07:00 pm40Good7.124.1
06:00 pm41Good7.524.0
05:00 pm42Good7.626.1
04:00 pm43Good7.726.1
03:00 pm42Good7.623.9
02:00 pm41Good7.421.5
01:00 pm37Good6.719.3
12:00 pm35Good6.321.3
11:00 am35Good6.323.5
10:00 am35Good6.321.5
09:00 am36Good6.423.5
08:00 am42Good7.526.7
07:00 am41Good7.321.9
06:00 am44Good7.923.4
05:00 am48Good8.624.8
04:00 am52Moderate9.624.5
03:00 am52Moderate9.424.9
02:00 am41Good7.423.5
01:00 am41Good7.429.5
12:00 am40Good7.126.5
11:00 pm39Good6.928.2
10:00 pm43Good7.735.5
09:00 pm47Good8.532.5
08:00 pm51Moderate9.132.3
07:00 pm46Good8.431.4
06:00 pm38Good6.820.4
05:00 pm34Good6.121.4
04:00 pm34Good6.118.8
03:00 pm33Good6.015.5
02:00 pm32Good5.714.3
01:00 pm33Good5.915.6
12:00 pm34Good6.117.6
11:00 am35Good6.320.2
10:00 am35Good6.317.5
09:00 am37Good6.720.6
08:00 am40Good7.218.8
07:00 am43Good7.818.3
06:00 am51Moderate9.317.3
05:00 am52Moderate9.522.3
04:00 am53Moderate10.119.6
03:00 am53Moderate10.017.6
02:00 am46Good8.414.9
01:00 am36Good6.514.9
12:00 am37Good6.616.6
11:00 pm34Good6.117.7
10:00 pm32Good5.714.7
09:00 pm33Good5.916.9
08:00 pm28Good5.013.8
07:00 pm27Good4.812.8
06:00 pm28Good5.112.7
05:00 pm30Good5.310.8
04:00 pm33Good5.912.6
03:00 pm26Good4.611.4
02:00 pm28Good5.010.9
01:00 pm27Good4.810.9
12:00 pm26Good4.811.0
11:00 am27Good4.911.0
10:00 am28Good5.010.0
09:00 am28Good5.111.0
08:00 am28Good5.011.5
07:00 am29Good5.312.2
06:00 am30Good5.512.2
05:00 am39Good7.114.5
04:00 am43Good7.814.3
03:00 am33Good5.912.1
02:00 am31Good5.515.0
01:00 am30Good5.416.9
12:00 am35Good6.217.5
11:00 pm33Good6.017.2
10:00 pm29Good5.219.0
09:00 pm33Good6.019.7
08:00 pm36Good6.521.7
07:00 pm36Good6.418.9
06:00 pm35Good6.216.9
05:00 pm34Good6.116.8
04:00 pm33Good6.016.8
03:00 pm31Good5.518.3
02:00 pm28Good5.112.5
01:00 pm26Good4.713.1
12:00 pm27Good4.812.5
11:00 am30Good5.412.8
10:00 am33Good5.914.5
09:00 am37Good6.614.5
08:00 am41Good7.414.4
07:00 am37Good6.613.4
06:00 am44Good8.016.0
05:00 am39Good7.014.9
04:00 am41Good7.513.8
03:00 am39Good7.015.7
02:00 am30Good5.415.2
01:00 am32Good5.816.6
12:00 am61Moderate6.176.4
11:00 pm52Moderate6.958.3
10:00 pm45Good8.125.6
09:00 pm48Good8.627.5
08:00 pm52Moderate9.527.7
07:00 pm52Moderate9.525.1
06:00 pm51Moderate9.324.1
05:00 pm52Moderate9.826.1
04:00 pm53Moderate10.123.1
03:00 pm52Moderate9.819.9
02:00 pm49Good8.915.1
01:00 pm46Good8.214.1
12:00 pm48Good8.610.2
11:00 am36Good6.410.7
10:00 am34Good6.111.3
09:00 am35Good6.312.7
08:00 am37Good6.714.4
07:00 am37Good6.615.9
06:00 am40Good7.217.6
05:00 am41Good7.417.6
04:00 am48Good8.724.5
03:00 am43Good7.723.5
02:00 am41Good7.423.6
01:00 am41Good7.423.6
12:00 am44Good8.025.7
11:00 pm47Good8.424.0
10:00 pm49Good8.823.9
09:00 pm51Moderate9.122.9
08:00 pm52Moderate9.522.1
07:00 pm53Moderate10.224.0
06:00 pm53Moderate10.219.2
05:00 pm53Moderate9.923.8
04:00 pm48Good8.719.9
03:00 pm41Good7.414.6
02:00 pm32Good5.79.2
01:00 pm31Good5.510.0
12:00 pm32Good5.710.0
11:00 am33Good6.012.0
10:00 am34Good6.112.1
09:00 am34Good6.212.1
08:00 am35Good6.312.2
07:00 am34Good6.112.7
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