北京17日夜间、18日白天，预计空气质量1级优
Xin Lang Cai Jing·2026-01-17 09:29
Group 1 - The air quality index is expected to be between 25-45, indicating a level of 1, which is classified as excellent for the night of the 17th and during the day on the 18th [1] - Favorable dispersion conditions are anticipated, with the possibility of snowfall on the 18th [1] - The air quality index is projected to remain at level 1 for the following days, specifically on the 19th, 20th, and 21st [1]