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The ministry of environmental protection is expected to amend the air test standards or the end of the year


The meeting of the ministry of environmental protection at the end of August will report on the revision of environmental air quality standards.
A revised version of the standard, which was asked for public opinion earlier this year, will increase the monitoring of ozone 8 hours. PM2.5 may not be added to the new standard, but it is starting to be used as a reference point for local indicators. This is the two most controversial indicators of domestic air quality.
It is understood that the revision is still in the process of consultation, and the new standards may be introduced at the end of the year.
The standard, though wide, still protects the public health
In 1982, the "atmospheric environmental quality standards" was formulated, and there were only six pollutant projects. Has carried on the revision for the first time, in 1996 changed its name to "ambient air quality standard", expanded to 10 pollutants projects, since then, the environmental protection and local modification is carried out in 2000, cancelled the nitrogen oxide index, and relax the standard of the nitrogen dioxide and ozone.
One of the most interesting revisions to this revision is the addition of an eight-hour average concentration of ozone.
Of environmental protection, the environmental air quality standard (draft) manual "(hereinafter referred to as" instructions "), wrote mainly 8 hours continuously highest concentration limit of ozone air quality standards has become the world trend of environmental air quality and the concentration of one hour limit can not meet the demand of the environmental management.
The revision limit ozone 8 hours the average concentration of the secondary standard set at 160 micrograms/m3, the concentration limit although relatively wide in the world, but basically can play the role of protecting public health.
According to the instructions, exposure to ozone concentrations of 120 micrograms per cubic meter for six to eight hours is a health hazard. The average concentration of ozone between 2001 and 2002 was between 14.4 and 232 micrograms per cubic meter, an average of 88.9 micrograms per cubic meter.
The ozone standard had previously been monitored for an hour
After the environmental air quality standards, is not without ozone monitor, but is based on the monitoring value of one hour, the monitoring to each hour of the day's biggest ozone concentration as indicators, however, the time value cannot reflect the long time accumulation of ozone concentration of chronic damage to human body.
"It should be said that this is a scientific advance and a more comprehensive consideration of the effects of ozone pollution." Shao min, professor of environmental science and engineering at Peking University. He added that standards and disclosure are two things. An hour of ozone monitoring has been on the national standards before, but has not been made public.
Background information
Inhalable particulate matter
PM2.5 refers to particulate matter that is less than or equal to 2.5 microns in diameter, and is less than 1/20th the diameter of a human hair. At present, in particulate matter of urban air quality daily or weekly standard is PM10, refers to the equal or less than 10 microns in diameter, particles can enter the human respiratory system.

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