Analysis of the causes of heavy aerosol pollution in Beijing, China: A case study with the WRF-Chem model

- An aerosol pollution episode was analyzed to study the causes and variability of the heavy haze.
- Intensive in situ measurements were used in this study.
- WRF-Chem model was used to study contribution of local and regional emissions to the heavy haze.
- The weak wind and low PBL height played important roles for the formation of the heavy haze.
- During this episode, the local emission was the major cause for the formation of the heavy haze.