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Improving the air quality in China is a long and arduous task. AlthoughChina has made very aggressive plans for air pollutant control, thedifficulties in achieving the new air quality goals are still significant. Alot of cities are developing their implementation plan (CIP) for new airquality goals. In this study, a southern city, Guangzhou, has been selected toanalyze the feasibility and difficulties of new air quality standardcompliance, as well as the CIP evaluation. A comprehensive study of the airquality status in Guangzhou and the surrounding area was conducted using 22monitoring sites collection data for O3, PM2.5 and PM10. Themonthly non-attainment rates for O3 vary from 7 to 25% for May toNovember. The city average PM2.5 concentration was 53 μg m−3in Guangzhou in 2010, which needs to be reduced by at least 34%to achieve the target of 35 μg m−3. The PM2.5 highviolation months are from November to March. A CIP was developed forGuangzhou, which focused on PM2.5. Based on the CIP, the emissionamounts of NOx, PM10, PM2.5 and volatile organic compounds (VOCs) in 2025 would be controlledto 119, 61, 26 and 163 thousand tons, respectively, reduced by 51.9%,55.9%, 61.8% and 41.3%, respectively, compared to 2010. Analysis of air qualityusing the model MM5-STEM suggests that the long-term control measures wouldachieve the PM2.5 and PM10 goals successfully by 2025. ThePM2.5 annual average concentration would be reduced to 27 μg m−3in 2025. However, such PM2.5-based emission control scenariosmay enhance the ozone pollution problems. The O3 non-attainment ratewould increase from 7.1% in 2010 to 12.9% in 2025, implying that ozonewill likely become a major compliance issue with the new national ambient air quality standards (NAAQS). Thissuggests that O3 control must be taken into account while designingPM2.5 control strategies, especially PM2.5 compliance underincreased atmospheric oxidation, and for VOCs / NOx reduction ratios need tobe further investigated, in order to eventually achieve O3–PM2.5co-improvement in this region or other cities

atmospheric chemistry and physics

Feasibility and difficulties of China's new air quality standard compliance: PRD case of PM&amp;lt;sub&amp;gt;2.5&amp;lt;/sub&amp;gt; and ozone from 2010 to 2025