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Air pollution levels dropped in early 2020 due to quarantines addressing the [[COVID-19 pandemic in mainland China|coronavirus pandemic]]. By early 2021, however, the levels had risen again.<ref>{{cite journal |last1=Wu |first1=Shugang |last2=Zhou |first2=Weijian |author-link2=Weijian Zhou|last3=Xiong |first3=Xiaohu |last4=Burr |first4=G.S. |last5=Cheng |first5=Peng |last6=Wang |first6=Peng |last7=Niu |first7=Zhenchuan |last8=Hou |first8=Yaoyao |title=The impact of COVID-19 lockdown on atmospheric CO2 in Xi'an, China |journal=Environmental Research |date=June 2021 |volume=197 |pages=111208 |doi=10.1016/j.envres.2021.111208|pmid=33895110 |pmc=8061636 }}</ref><ref>{{Cite web|last=Asmelash|first=Leah|date=16 March 2021|title=Satellite images show air pollution returning to pre-pandemic levels as restrictions loosen|url=https://www.cnn.com/2021/03/16/us/covid-air-pollution-return-trnd/index.html|access-date=2021-03-16|website=CNN}}</ref> |
Air pollution levels dropped in early 2020 due to quarantines addressing the [[COVID-19 pandemic in mainland China|coronavirus pandemic]]. By early 2021, however, the levels had risen again.<ref>{{cite journal |last1=Wu |first1=Shugang |last2=Zhou |first2=Weijian |author-link2=Weijian Zhou|last3=Xiong |first3=Xiaohu |last4=Burr |first4=G.S. |last5=Cheng |first5=Peng |last6=Wang |first6=Peng |last7=Niu |first7=Zhenchuan |last8=Hou |first8=Yaoyao |title=The impact of COVID-19 lockdown on atmospheric CO2 in Xi'an, China |journal=Environmental Research |date=June 2021 |volume=197 |pages=111208 |doi=10.1016/j.envres.2021.111208|pmid=33895110 |pmc=8061636 }}</ref><ref>{{Cite web|last=Asmelash|first=Leah|date=16 March 2021|title=Satellite images show air pollution returning to pre-pandemic levels as restrictions loosen|url=https://www.cnn.com/2021/03/16/us/covid-air-pollution-return-trnd/index.html|access-date=2021-03-16|website=CNN}}</ref> |
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The Chinese government realized that the pollution had an effect on |
The Chinese government realized that the pollution had an effect on its regime's satisfaction so it increased funding to reduce dissatisfaction. An example of this is that in 2013, China's Academy for Environmental Planning pledged $277 billion to combat urban air pollution.<ref name=":2" /> In the first batch of 74 cities that implemented the 2012 Environmental Air Quality Standards, the average concentration of PM2.5 and sulfur dioxide dropped by 42 percent and 68 percent, respectively, between 2013 and 2018.<ref>{{Cite web|url=http://www.ecns.cn/cns-wire/2019-06-05/detail-ifziyumy2108996.shtml|title=China reports air quality progress from 2013 to 2018|website=www.ecns.cn|access-date=28 September 2019}}</ref> |
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[[Zhong Nanshan]], the president of the [[China Medical Association]], warned in 2012 that air pollution could become China's biggest health threat.<ref>{{Cite news|url=https://www.theguardian.com/environment/2012/mar/16/air-pollution-biggest-threat-china|title=Air pollution could become China's biggest health threat, expert warns|last=Watts|first=Jonathan|date=16 March 2012|work=The Guardian|access-date=29 April 2017|language=en-GB|issn=0261-3077}}</ref> Measurements by Beijing municipal government in January 2013 showed that highest recorded level of PM2.5 (particulate matter smaller than 2.5 micrometers in size), was at nearly 1,000 μg per cubic meter.<ref name="NYT43133">{{cite news|url=https://www.nytimes.com/2013/04/04/world/asia/two-major-air-pollutants-increase-in-china.html|title=2 Major Air Pollutants Increase in Beijing|last=Wong|first=Edward|date=3 April 2013|access-date=4 April 2013|newspaper=The New York Times}}</ref> PM<sub>2.5</sub>, consisting of K<sup>+</sup>, Ca<sup>2+</sup>, NO<sub>3</sub><sup>−</sup>, and SO<sub>4</sub><sup>2-</sup>, had the most fearsome impact on people's health in Beijing throughout the year, especially in cold seasons.<ref>{{Cite journal|last1=Li|first1=Lei|last2=Li|first2=Hong|last3=Zhang|first3=Xinmin|last4=Wang|first4=Li|last5=Xu|first5=Linghong|last6=Wang|first6=Xuezhong|last7=Yu|first7=Yanting|last8=Zhang|first8=Yujie|last9=Cao|first9=Guan|date=January 2014|title=Pollution characteristics and health risk assessment of benzene homologues in ambient air in the northeastern urban area of Beijing, China|journal=Journal of Environmental Sciences|volume=26|issue=1|pages=214–223|doi=10.1016/s1001-0742(13)60400-3|pmid=24649709|issn=1001-0742}}</ref> Traces of smog from mainland China has been observed to reach as far as California.<ref>{{cite news|url=https://www.theguardian.com/world/2013/feb/16/chinese-struggle-through-airpocalypse-smog?INTCMP=SRCH|title=Chinese struggle through 'airpocalypse' smog|last=Kaiman|first=Jonathan|date=16 February 2013|work=The Guardian|location=London|access-date=4 March 2013}}</ref> |
[[Zhong Nanshan]], the president of the [[China Medical Association]], warned in 2012 that air pollution could become China's biggest health threat.<ref>{{Cite news|url=https://www.theguardian.com/environment/2012/mar/16/air-pollution-biggest-threat-china|title=Air pollution could become China's biggest health threat, expert warns|last=Watts|first=Jonathan|date=16 March 2012|work=The Guardian|access-date=29 April 2017|language=en-GB|issn=0261-3077}}</ref> Measurements by Beijing municipal government in January 2013 showed that highest recorded level of PM2.5 (particulate matter smaller than 2.5 micrometers in size), was at nearly 1,000 μg per cubic meter.<ref name="NYT43133">{{cite news|url=https://www.nytimes.com/2013/04/04/world/asia/two-major-air-pollutants-increase-in-china.html|title=2 Major Air Pollutants Increase in Beijing|last=Wong|first=Edward|date=3 April 2013|access-date=4 April 2013|newspaper=The New York Times}}</ref> PM<sub>2.5</sub>, consisting of K<sup>+</sup>, Ca<sup>2+</sup>, NO<sub>3</sub><sup>−</sup>, and SO<sub>4</sub><sup>2-</sup>, had the most fearsome impact on people's health in Beijing throughout the year, especially in cold seasons.<ref>{{Cite journal|last1=Li|first1=Lei|last2=Li|first2=Hong|last3=Zhang|first3=Xinmin|last4=Wang|first4=Li|last5=Xu|first5=Linghong|last6=Wang|first6=Xuezhong|last7=Yu|first7=Yanting|last8=Zhang|first8=Yujie|last9=Cao|first9=Guan|date=January 2014|title=Pollution characteristics and health risk assessment of benzene homologues in ambient air in the northeastern urban area of Beijing, China|journal=Journal of Environmental Sciences|volume=26|issue=1|pages=214–223|doi=10.1016/s1001-0742(13)60400-3|pmid=24649709|issn=1001-0742}}</ref> Traces of smog from mainland China has been observed to reach as far as California.<ref>{{cite news|url=https://www.theguardian.com/world/2013/feb/16/chinese-struggle-through-airpocalypse-smog?INTCMP=SRCH|title=Chinese struggle through 'airpocalypse' smog|last=Kaiman|first=Jonathan|date=16 February 2013|work=The Guardian|location=London|access-date=4 March 2013}}</ref> |
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