What is Air Quality Score (AQS)?

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Atmotube detects a very wide range of harmful gases, toxins, and volatile organic compounds (as well as PMs in the PRO version). For your convenience, we created an accumulative parameter called Air Quality Score (AQS) that can instantly give you an understanding of the quality of the air around you.

AQS changes from 0 (severely polluted air) to 100 (very clean) points.

Air is good (81-100)

Air quality is considered satisfactory, and air pollution poses little or no risk.

Air is moderate (61-80)

Air quality is acceptable; however, some pollutants can cause moderate health concerns for a very small number of people who are unusually sensitive to air pollution.

Air is polluted (41-60)

Members of sensitive groups may experience health effects. Most people are unlikely to be affected.

Air is very polluted (21-40)

Everyone may begin to experience health effects; for members of sensitive groups, health effects may be more serious.

Air is severely polluted (0-20)

Health alert: everyone may experience more serious health effects. Everyone should avoid all outdoor exertion.

AQS Calculation

State of Your Air	Air Quality Score	PM1 (ug/m3)	PM2.5 (ug/m3)	PM10 (ug/m3)	TVOC (ppm)
Good	81 - 100	0 - 14	0 - 20	0 - 30	0 - 0.3
Moderate	61 - 80	14 - 34	20 - 50	30 - 75	0.3 - 1
Polluted	41 - 60	34 - 61	50 - 90	75 - 125	1 - 2.5
Very Polluted	21 - 40	61 - 95	90 - 140	125 - 200	2.5 - 5.5
Severely Polluted	0 - 20	95 - 100	140 - 170	200 - 250	>5.5

The AQS calculation is driven by our in-house algorithm, which incorporates the threshold values for particulate matter (PM) and volatile organic compounds (VOCs). The algorithm is publicly accessible via our open-source library at this link.