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Table 3 Fine particulate matter indices

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

Index level Category PM2.5 concentration (μg/m3) People’s life
1 Low 0–11 May go out as usual
2 Low 12–23  
3 Low 24–35  
4 Medium 36–41  
5 Medium 42–47  
6 Medium 48–53  
7 High 54–58 Go out less if there are symptoms, such as sore eyes and throat
8 High 59–64  
9 High 65–70  
10 Very high  > 70 Try not to go out