Trend of selenium in PM₂.₅ annual means across the roadside air monitoring network, 2016-2021
- Selenium in PM₂.₅ (annual mean)
Trend of selenium in PM₂.₅ annual means across the roadside air monitoring network, 2016-2021| Year | Selenium in PM₂.₅ (annual mean) |
|---|
| 2016 | 0.6 ng/m³ |
| 2017 | 0.6 ng/m³ |
| 2018 | 0.5 ng/m³ |
| 2019 | 0.6 ng/m³ |
| 2020 | 0.6 ng/m³ |
| 2021 | 0.7 ng/m³ |