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Cold front from north brings city pollution and chilly, wet weather
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CHILLY, wet weather is forecast for this week as the city feels the influence of a cold front that arrived early yesterday, bringing pollution from the north.
The Shanghai Meteorological Bureau yesterday afternoon issued a blue alert for the cold sweep, which will see temperatures drop by 8 degrees Celsius from yesterday’s levels to a low of 5 degrees and a high of 9 today.
Today will be cloudy with light rain in the morning, said forecasters.
Temperatures will then fall further, with the low early Tuesday and Wednesday set to be around 3 to 4 degrees.
Shanghai residents awoke to thick fog yesterday morning, partly influenced by the arrival of the cold front.
In most parts of the city, visibility fell below 500 meters and less than 200 meters in some areas.
Forecasters said the previous warm days with little wind and a large temperature difference between day and night led to thick fog with the arrival of cold front.
On Saturday, temperatures reached 23.4 degrees Celsius — Shanghai’s warmest day during the Spring Festival in the past six years.
But the combined effects of fog and smog caused the city’s air quality to worsen quickly overnight.
The density of PM2.5 — fine particles that are especially hazardous — rose from 70 micrograms per cubic meter at 5pm on Saturday to about 260 micrograms per cubic meter at 11am yesterday.
The national PM2.5 limit is 75 micrograms per cubic meter.
PM2.5 density started to drop in the afternoon, falling to 120.6 micrograms per cubic meter in the evening.
The Air Quality Index indicated that the city’s air quality yesterday was highly polluted, the second worst under a six-level system.
According to the Shanghai Environmental Monitoring Center, air quality is expected to be good today.
The National Meteorological Center said strong cold fronts will bring about a drop in temperatures of more than 10 degrees in northeastern China today.
Stronger winds are predicted for some eastern areas, dispersing fog and pollution, according to the center.
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