Core Insights - The air pollution event in the Beijing-Tianjin-Hebei region began on November 3, with PM2.5 concentrations significantly increasing due to regional transmission, peaking at 162 micrograms per cubic meter on November 5 [1][2] Group 1: Pollution Causes - The high pollution emission levels in the region before the heating season are identified as the fundamental cause of the pollution event [3] - The operational rates of industries such as brick, tile, and ceramics increased by 3 percentage points year-on-year, and heavy truck traffic rose by 7% during this period [3] - The region is experiencing unfavorable atmospheric diffusion conditions due to the transition from autumn to winter, leading to the accumulation of pollutants [3] Group 2: Impact on Beijing - During the pollution event, nearly 70% of Beijing's pollution was attributed to regional transmission, with local contributions accounting for 34% [4] - The average PM2.5 concentration in Beijing rose rapidly, with a peak increase of 17 micrograms per cubic meter within one hour [4] - Forecast models indicate that from November 6 to 8, diffusion conditions will improve, leading to a potential reduction in pollution levels, with expectations of reaching a good air quality level by November 7 [4]