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Full PM2.5 release gets start
By Cai Wenjun and Ni Yinbin |
June 28, 2012, Thursday
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Print Edition
Print Edition
SHANGHAI'S fine-particle density pollution was better than expected because of rain yesterday as the city began to release PM2.5 readings collected from 10 monitoring spots.
At 6pm, the average density of PM2.5 - particles measuring 2.5 microns or less in diameter - in the latest 24 hours was 15.2 micrograms per cubic meter, in the good air quality range, according to the website of the Shanghai Environmental Monitoring Center.
However, as rains diminished in the late afternoon, the PM2.5 figures began to rise. At 8pm, the hourly reading was 34.8 micrograms and the 24-hour average had risen to 15.7.
China's national standard is a daily average of 75 micrograms per cubic meter.
The city's air quality may remain good this week as the rain hangs around, officials said.
Shanghai's hourly updated PM2.5 readings and a chart showing PM2.5 changes in 24 hours are available on the bureau's site, www.semc.gov.cn, and on its microblog. They are in Chinese, but the bureau said a bilingual version will be provided later.
Since March, Shanghai has released real-time PM2.5 figures at two monitoring spots in Putuo and Pudong's Zhangjiang area.
Shanghai has established 30 PM2.5 monitoring spots, including 10 national spots which are mostly in downtown districts. A spot in suburban Dianshan Lake is used as a benchmark for good air quality and is not included in local air quality evaluations.
However, the PM2.5 readings at Dianshan Lake in Qingpu District was the highest among all the 10 spots yesterday since the ocean breeze from the east carried an accumulation of particles into the city's western Qingpu area.
Officials said they may reconsider placement of the benchmark spot since Dianshan Lake is likely to be influenced by pollution from nearby districts.
Intermittent rain should diminish today and tomorrow, while heavy showers are expected to return for the weekend, according to the Shanghai Meteorological Bureau.
With the northward movement of a subtropical high pressure system, the plum rain belt should move above the Huaihe River region and the city should be near the southern edge of the belt starting today, Fu Yi, a chief bureau officer, said yesterday.
Plum rain season usually starts in mid-June and ends in early July along the middle and lower reaches of the Yangtze. The climate during this period features continual rain and heat. Ancient Chinese timed the arrival of the season by the growth of the plum, hence the name.
The week is expected to heat up, with the temperature climbing above 30 degrees Celsius starting tomorrow, Fu added.
Today is forecast to be showery to overcast and the readings should range from a low of 23 degrees Celsius to a high of 28. Tomorrow should be cloudy with thundershowers in part of the city and the mercury is expected to reach 33 degrees, the bureau said.
"The rain in the following days should be mostly local thundershowers as the city is in a relatively warm air mass," Fu said. "As a result, the temperature should climb as well and the weather should turn damp and muggy."
The temperature should gradually climb in the following days and hit 34 degrees Celsius on Saturday.
Meanwhile, this year's sixth tropical storm, Doksuri, was moving toward south Taiwan Island at 20 kilometers per hour after being formed in the Pacific on Tuesday. The storm should affect the island starting today.
At 6pm, the average density of PM2.5 - particles measuring 2.5 microns or less in diameter - in the latest 24 hours was 15.2 micrograms per cubic meter, in the good air quality range, according to the website of the Shanghai Environmental Monitoring Center.
However, as rains diminished in the late afternoon, the PM2.5 figures began to rise. At 8pm, the hourly reading was 34.8 micrograms and the 24-hour average had risen to 15.7.
China's national standard is a daily average of 75 micrograms per cubic meter.
The city's air quality may remain good this week as the rain hangs around, officials said.
Shanghai's hourly updated PM2.5 readings and a chart showing PM2.5 changes in 24 hours are available on the bureau's site, www.semc.gov.cn, and on its microblog. They are in Chinese, but the bureau said a bilingual version will be provided later.
Since March, Shanghai has released real-time PM2.5 figures at two monitoring spots in Putuo and Pudong's Zhangjiang area.
Shanghai has established 30 PM2.5 monitoring spots, including 10 national spots which are mostly in downtown districts. A spot in suburban Dianshan Lake is used as a benchmark for good air quality and is not included in local air quality evaluations.
However, the PM2.5 readings at Dianshan Lake in Qingpu District was the highest among all the 10 spots yesterday since the ocean breeze from the east carried an accumulation of particles into the city's western Qingpu area.
Officials said they may reconsider placement of the benchmark spot since Dianshan Lake is likely to be influenced by pollution from nearby districts.
Intermittent rain should diminish today and tomorrow, while heavy showers are expected to return for the weekend, according to the Shanghai Meteorological Bureau.
With the northward movement of a subtropical high pressure system, the plum rain belt should move above the Huaihe River region and the city should be near the southern edge of the belt starting today, Fu Yi, a chief bureau officer, said yesterday.
Plum rain season usually starts in mid-June and ends in early July along the middle and lower reaches of the Yangtze. The climate during this period features continual rain and heat. Ancient Chinese timed the arrival of the season by the growth of the plum, hence the name.
The week is expected to heat up, with the temperature climbing above 30 degrees Celsius starting tomorrow, Fu added.
Today is forecast to be showery to overcast and the readings should range from a low of 23 degrees Celsius to a high of 28. Tomorrow should be cloudy with thundershowers in part of the city and the mercury is expected to reach 33 degrees, the bureau said.
"The rain in the following days should be mostly local thundershowers as the city is in a relatively warm air mass," Fu said. "As a result, the temperature should climb as well and the weather should turn damp and muggy."
The temperature should gradually climb in the following days and hit 34 degrees Celsius on Saturday.
Meanwhile, this year's sixth tropical storm, Doksuri, was moving toward south Taiwan Island at 20 kilometers per hour after being formed in the Pacific on Tuesday. The storm should affect the island starting today.
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