Beijing will launch an orange alert for heavy air pollution, and diffusion conditions are expected to improve from November 11. Affected by unfavorable meteorological conditions of regional low pressure, temperature inversion, static stability and high humidity, a regional air pollution process occurred in Beijing-Tianjin-Hebei and surrounding areas. According to the latest forecast results, from October 10 to November 30, Beijing is expected to have a moderate PM11.2 pollution process. Since November 2, the northern high-pressure system has moved southward, and the diffusion conditions have improved.