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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)

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