Table 1 The O3 concentration limits of the NAAQS in China and the WHO (unit: μg/m3).
From: Spatiotemporal distribution of ground-level ozone in China at a city level
NAAQS | Who | |||
|---|---|---|---|---|
Grade 1 | Grade 2 | Air Quality Guidelines (AQG) | Interim target 1 | High level |
100 | 160 | 100 | 160 | 240 |
