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Evolution, Transport Characteristics, and Potential Source Regions of $PM_{2.5}$ and $O_{3}$ Pollution in a Coastal City of China during 2015–2020
| Content Provider | MDPI |
|---|---|
| Author | Lv, Min Hu, Anyong Chen, Jun Wan, Bingcheng |
| Copyright Year | 2021 |
| Description | The evolution, transport characteristics, and potential source regions of $PM_{2.5}$ and $O_{3}$ were investigated from 1 January 2015 to 31 December 2020 in the coastal city of Nantong. The annual mean $PM_{2.5}$ concentration declined obviously over the entire study period, and was 34.7 $μg/m^{3}$ in 2020. $O_{3}$ had a relatively smooth decreasing trend, but rebounded greatly during 2017 when the most frequent extreme high-temperature events occurred. Similar trends were observed for $PM_{2.5}$ and $O_{3}$ polluted hours. No $PM_{2.5}-O_{3}$ complex air pollution happened in 2019 and 2020, likely suggesting the preliminary results from the implementation of emission controls. Notable differences in transport pathways and frequencies were observed from the backward trajectory clusters in four seasons in Nantong. Clusters with the largest percentage of polluted $PM_{2.5}$ and $O_{3}$ trajectories were transported mostly over short distances rather than long distances. Analysis involving the potential source contribution function (PSCF) and concentration weighted trajectory (CWT) showed that $PM_{2.5}$ polluted sources were from the adjacent western and northwestern provinces, whereas the influence of eastern marine sources was relatively small. $O_{3}$ had a greatly different spatial distribution of polluted source regions from $PM_{2.5}$, mostly covering the North China Plain, the Bohai Sea, and the Yellow Sea. |
| Starting Page | 1282 |
| e-ISSN | 20734433 |
| DOI | 10.3390/atmos12101282 |
| Journal | Atmosphere |
| Issue Number | 10 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-10-01 |
| Access Restriction | Open |
| Subject Keyword | Atmosphere Environmental Engineering Pm2.5 Evolution Backward Trajectory Transport Pathway Potential Source Region Coastal City |
| Content Type | Text |
| Resource Type | Article |
