Another values of NO2 (Grade II) and O3

Another document that intended for this topic is
called Ambient Air Quality Standard (AAQS). This regulation was initially formulated
in 1982, which was the first official G1 G2 G3 G4 G5 G6 document aiming to improve ambient air quality.

According to Zhang, et al. (2016),
the first amendment of AAQS was implemented in 1996, which included three grade
standards (I, II and III) and suggested the limit values of seven primary air
pollutants (SO2, NOx, NO2, CO, O3,
PM10 and TSP). The second amendment was conducted in 2000, which
removed the standard of NOx pollutant and set the limit values of NO2
(Grade II) and O3 (Grade I and II). In February 2012, the third
amendment was managed by Ministry of Environmental Protection (MEP), which
added the standards of PM2.5 and Max. 8-h O3 pollutants
as well as tightened the guideline values of NO2 (Grade II and Grade
I 1-hr) and PM10 (Grade II annual). Based on the third amendment of
AAQS, Zhang, et al. (2016) emphasisedG7  that megacities in China (such as Beijing,
Guangzhou and Shanghai) were being under pressure to improve urban air quality,
which focused for further substantial reductions of motorised vehicle
emissions.G8  Table 21 below shows the national ambient air
quality standard in China as the third amendment in 2012.G9 

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