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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.
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
The Common Air Quality Index (CAQI) [21] is an air quality index used in Europe since 2006. [22] In November 2017, the European Environment Agency announced the European Air Quality Index (EAQI) and started encouraging its use on websites and for other ways of informing the public about air quality. [23]
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).
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.
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.
This approach is different from how the National Ambient Air Quality Standards are set in the US, where cost is explicitly not considered in the proposal to strengthen the air quality standards to protect human health and the environment. In addition, the US NAAQS are periodically reviewed, frequently strengthened, commonly enforced and allow ...
Whitman v. American Trucking Associations, Inc., 531 U.S. 457 (2001), was a case decided by the United States Supreme Court in which the Environmental Protection Agency's National Ambient Air Quality Standard (NAAQS) for regulating ozone and particulate matter was challenged by the American Trucking Association, along with other private companies and the states of Michigan, Ohio, and West ...