PM25
(fog and
haze)(anti-dust mask)(air purifier)(air quality index, AQI)PM2.5(particulate matter) ""PM2.5
VIP
Longtime exposure to particulate matter especially the particulate matter smaller than 2.5 micrometers (PM2.5) which can go directly to the alveoli of the lungs, is a major health hazard.
2.5(PM2.5)
PM2.5""PM particulate matter()PM2.5  2.5
alveoli of the lungs()"
"1/20PM2.5 vehicle exhaust()
PM2.5fine
particles()toxic and harmful substance( )
PM2.5
measurement(PM2.5)air quality
monitoring()PM2.5
2.5
China's environmental authorities are to implement new air quality standards which will now measure some of the smallest and most damaging particles in the air. In many cities, the public are being consulted over the introduction of the new standards
several什么意思which will find out just how clean the air really is.
Smog in Beijing. Smog in Shanghai. Smog in Hangzhou - During recent months, dense pollution has frequently blanketed many cities in China. Sometimes visibility drops to less than 1 kilometer, causing serious traffic jams, flight delays and highway closures.
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1 It has also raised public awareness of the issue. Ma Jun has been conducting environmental research since the mid 1990s and in 2006, he founded his own NGO in Beijing.
902006
The Ministry of Environmental Protection's newly published air quality standard includes monitoring of PM2.5 - a kind of air particle with a diameter of 2.5 microns or less. These particulates are small enough to penetrate human lung tissue, causing severe health problems. The revised standard is now open for public input and will take effect from 2016. PM2.5----PM2.5
2.5
2016 Responding to the new air quality standard, several cities, including Shanghai and Nanjing, announced that they are preparing pilot programs that will start to monitor and publish PM 2.5 levels soon. Experts believe that the monitoring results in some cities might not initially meet international standards.
PM2.4 Stricter air standards will reveal more environmental hazards and