Core Viewpoint - Beijing is expected to experience a period of light pollution from November 5 to 8, primarily due to unfavorable meteorological conditions and local emissions, with air quality predicted to reach level 3 (light pollution) and potentially level 4 (moderate pollution) during certain periods [1][3]. Summary by Relevant Sections Pollution Forecast - The air quality in Beijing is forecasted to be at level 3 (light pollution) from November 5 to 6, with some areas possibly reaching level 4 (moderate pollution) [1][3]. - On November 7, conditions are expected to improve to level 2 (good) due to the influence of a northeastern high-pressure system and potential precipitation [1][3]. - On November 8, pollution is expected to return, with air quality ranging from level 2 (good) to level 3 (light pollution) [1][3]. Causes of Pollution - The increase in pollution is attributed to a combination of reduced atmospheric capacity and increased regional emissions as autumn and winter set in [1][3]. - Adverse meteorological conditions, including weak pressure systems and significant temperature inversions, are causing pollutants to accumulate near the ground [1][3]. - High relative humidity levels are contributing to the secondary formation of particulate matter, while regional southerly winds are exacerbating the situation by transporting pollutants into the area [1][3]. Duration and Future Outlook - The pollution event is expected to last for four days, with a shift to favorable dispersion conditions anticipated from November 9 due to incoming cold air [1][3].