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 |