The increased risk (R) of mortality from lung cancer resulting from long-term exposure to the annual average PM2.5 concentrations, as reported by WHO AQGs
| PM2.5 concentrations (µg/m3) | R (%)* |
|---|---|
| 35–60 | 15 |
| 25–35 | 9 |
| 15–25 | 3 |
| 10–15 | 0–3 |
*10 µg/m3 was regarded as the long-term guideline value for PM2.5; thus, in this study, we assumed that the risk of lung cancer did not increase with long-term exposure to PM2.5 concentrations of less than 10 µg/m3.
AQGs, air quality guidelines; PM, Particulate Matter.