School of Water and Environment, Chang'an University, Xi'an 710064, China.
School of Energy and Architecture, Xi'an Aeronautical Institute, Xi'an 710077, China.
Int J Environ Res Public Health. 2023 Jan 25;20(3):2170. doi: 10.3390/ijerph20032170.
The Fenwei Plain (FWP) remains one of the worst PM-polluted regions in China, although its air quality has improved in recent years. To evaluate the regional transport characteristics of PM emitted by coal-fired power plants in the FWP in wintertime, the primary PM, SO, and NOx emissions from coal-fired power plants with large units (≥300 MW) in 11 cities of the area in January 2019 were collected based on the Continuous Emission Monitoring System (CEMS). The spatial distribution and source contribution of primary and secondary PM concentrations were investigated using the Weather Research and Forecast (WRF) model and the California Puff (CALPUFF) model. The results showed that secondary PM was transported over a larger range than primary PM and that secondary nitrate was the main component of the total PM concentration, accounting for more than 70%. High concentrations of primary, secondary, and total PM mainly occurred in the Shaanxi region of the FWP, especially in Xianyang, where the PM concentrations were the highest among the 11 cities, even though its pollutant emissions were at moderate levels. The PM concentrations in Sanmenxia and Yuncheng primarily came from regional transport, accounting for 64% and 68%, respectively, while those in other cities were dominated by local emissions, accounting for more than 63%. The results may help to understand the regional transport characteristics of pollutants emitted from elevated point sources over a complex terrain.
汾渭平原（FWP）仍然是中国污染最严重的 PM 地区之一，尽管近年来空气质量有所改善。为了评估冬季 FWP 燃煤电厂排放的 PM 在区域传输的特征，基于连续排放监测系统（CEMS）收集了该地区 11 个城市的 11 个大型燃煤电厂（≥300MW）的一次 PM、SO 和 NOx 排放。使用天气研究与预测（WRF）模型和加利福尼亚烟羽（CALPUFF）模型研究了一次和二次 PM 浓度的空间分布和源贡献。结果表明，二次 PM 的传输范围大于一次 PM，二次硝酸盐是总 PM 浓度的主要成分，占比超过 70%。一次、二次和总 PM 的高浓度主要出现在 FWP 的陕西地区，尤其是在西安，其 PM 浓度在 11 个城市中最高，尽管其污染物排放量处于中等水平。三门峡和运城的 PM 浓度主要来自区域传输，分别占 64%和 68%，而其他城市则以本地排放为主，占比超过 63%。研究结果有助于理解复杂地形上高架点源排放的污染物在区域内的传输特征。
