Shanghai will initiate a yellow alert for heavy air pollution at 9 o'clock tonight, and moderate pollution is expected tomorrow afternoon.

On December 25th, Jin10 Data reported that Shanghai announced the activation of a yellow alert for severe air pollution and initiated level III emergency response measures starting from 21:00 on the same day. From the evening of December 25th to the 27th, due to the cumulative effect of local stability and upstream pollution transmission, it is expected to experience a moderate pollution process of PM2.5. It is predicted that on the night of the 25th, there will be light pollution with PM2.5 as the primary pollutant. On the morning of the 26th, the pollution will increase from light to moderate, with PM2.5 as the primary pollutant. In the afternoon of the 26th, there will be moderate pollution, with PM2.5 as the primary pollutant. On the night of the 26th, the pollution will return to light to moderate, with PM2.5 as the main pollutant. On the 27th, there will be light pollution with PM2.5. On the 28th, the air quality will be good with PM2.5.