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Table 11 Comparison of effects on AQI

From: Building an indoor air quality monitoring system based on the architecture of the Internet of Things

AQI index Status color Effects on human health Suggestions for activities
Air Quality Index (AQI)
Good (0–50) Green Good air quality and low pollution level Normal outdoor exercise
Normal (51–100) Yellow Having little effect on a few sensitive groups Normal outdoor exercise
Unhealthy for sensitive groups (101–150) Orange Having effects on sensitive groups, and insignificant effects on the general public The general public shall reduce long-time and vigorous outdoor exercise
Unhealthy for all groups (151–200) Red Having serious effects on sensitive groups, and effects on the general public The general public shall reduce outdoor activities if they feel ill
Students shall avoid long-time and vigorous exercise
Very unhealthy (201–300) Purple Having serious effects on the health of all groups The general public shall reduce outdoor exercise
Harmful (301–400) Maroon Immediate threat to health and serious effects on everyone The general public shall wear protective equipment, such as masks, if they go out
Harmful (401–500)