Tomorrow is expected to be the coldest day in Shanghai this winter so far, with temperatures of minus 1 degree Celsius or below, the city’s weather bureau said yesterday.
But it will be sunny and dry, forecasters said, with the arrival of a cold front today bringing an end to rain until the weekend.
Temperatures will begin to drop from today, with a low of 2 degrees and a high of 5.
Shanghai woke to moderate rain yesterday with increasing winds in advance of the cold front. The rain later turned to light drizzle.
Chongming Island had the heaviest rainfall with a reading of 14.3 millimeters by 7pm yesterday, while Qingpu District saw the least at 10.7 millimeters.
Today and tomorrow should be dry days but the rain is set to return at the weekend as temperatures start to rise again to between 2 and 8 degrees.
Yesterday was the fourth day that the city’s air quality was considered “good,” with the density of PM2.5 particles peaking at 40 micrograms per cubic meter at 3pm. For most of the day the reading was below 30.
Today’s air should be good to perfect, with the air quality index between 40 and 65. The air is deemed “perfect” when the AQI falls below 50.
After PM2.5 concentration was taken as one measure of the city’s air quality at the beginning of last year, the rate of good and perfect days dropped from over 90 percent to 66 percent in 2013, with 52 days rated perfect and 189 good.
Dianshan Lake, a scenic area in Qingpu District previously referred to as the “city’s garden” for its clean air, has been recording high levels of PM2.5, the tiny particles hazardous to health, officials said yesterday.
Since June 27, 2012, when local environmental authorities began releasing data from 10 monitoring stations online, PM2.5 readings at the Dianshan Lake station often ranked high on the list.
According to environmental authorities, the relatively high PM2.5 concentration could be the result of a number of factors — pollutants from other regions, local accumulation, or meteorological and geographic causes.
They said the lake’s moisture made pollutants gather more easily.
To pinpoint the exact cause, the Qingpu District government is to set up a research center within several months in the hope that experts can find a solution.
Researchers from the Shanghai Environmental Monitoring Center and East China Normal University attributed the air quality problems at Dianshan Lake to the development of suburban Qingpu District and neighboring cities resulting in more traffic, and pollution being blown in by easterly winds throughout the summer.