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The January 2024 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 5,390 towns and cities in 63 countries. Air quality in the database is represented by the annual mean concentration of particulate matter ( PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 micrometers, respectively).
Ambient air quality criteria, or standards, are concentrations of pollutants in the air, and typically refer to outdoor air.The criteria are specified for a variety of reasons including for the protection of human health, buildings, crops, vegetation, ecosystems, as well as for planning and other purposes.
Based on 2015's China Environmental Bulletin published by the Chinese government, in 2015 the national urban air quality is getting better. The first implementation of the new air quality standards has made the PM 2.5 average concentration decreased by 14.1% compared to the year of
Even if met, China's goals are below air quality targets recommended by the World Health Organization, but CREA has previously said they would still be enough to prevent as many as 180,000 ...
For example, GB 2312-1980 refers to the national compulsory standard (GB), sequential number 2312, revision year 1980. [6] Besides the national standard repository, China allows the registration of standards by industry/trade, by localities (DB, Dìfāng Biāozhǔn, "local standard"), by associations (T), or by an individual company (Q).
8.3 China. 8.4 Germany. 8.5 India. 8.6 New Zealand. 8.7 United ... Air quality standards are legal standards or requirements governing concentrations of air ...
Taizhou [a] is a city located at the middle of the East China Sea coast of Zhejiang province.It is located 300 km (190 mi) south of Shanghai and 230 km (140 mi) southeast of Hangzhou, the provincial capital.
The Clean Air Act requires the EPA to set US National Ambient Air Quality Standards (NAAQS) for the six CAPs. [6] The NAAQS are health based and the EPA sets two types of standards: primary and secondary. The primary standards are designed to protect the health of 'sensitive' populations such as asthmatics, children, and the elderly.