Two strong cold fronts are expected to drive down the temperatures this week, with Friday likely to hit the freezing point, weather forecasters said yesterday.
The first cold front arrived in the city yesterday afternoon with the mercury dropping 5.6 degrees Celsius within two hours. The high for the past Friday and Saturday were 19.5 and 21.7 degrees respectively.
Today the mercury will hover between 16 and 6 degrees. The second cold front is expected to come around Thursday with the lowest temperature dropping to 0-1 degree.
The meteorological winter is also round the corner as it officially sets in after the average temperature stays below 10 degrees for five consecutive days.
However, the two cold fronts will also bring clean air to the city. Last Friday it was declared to be “heavily polluted” as the PM2.5 – density of airborne particles smaller than 2.5 microns in diameter – reached 275 micrograms per cubic meter, nearly four times the national standard of 75 micrograms.
Yesterday, the air quality was “excellent” at 3pm as the PM2.5 reading dropped to 22 micrograms per cubic meter.
Source: Hangzhou International Center