As the biggest greenhouse gases (GHGs) emitter, China’s climate mitigation has tremendous contributions to the global carbon and air pollutants reductions. This study is trying to extract the co-benefit on air quality, public health and economic costs in China and worldwide from China’s GHGs mitigation policy. We construct two scenarios, with moderate climate mitigation action worldwide, versus more stringent climate mitigation action in China. We use the GAINS model to predict the GHGs and air pollutants emissions in the two scenarios, and a state-of-the-art global chemical transport model to simulate the annual PM2.5 concentrations. We then use IMED|HEL, which is a health assessment model, to estimate the health impacts and economic cost of PM2.5 pollution in each country. Results show China’s mitigation has significant impact on both air quality and health improvement in eastern China and eastern Asia, a little bit impact in the rest of Asia. The improved air quality could avoid 0.37 million premature deaths due to ambient PM2.5 exposure by 2050s globally, with the majority happening in China. We use the willingness to pay method to estimate the economic benefits from the improved air quailty, and find that the reduced ambient PM2.5 concentration could avoid $406 billion and $1206 billion economic costs by 2030s and 2050s globally, with China the largest fraction of 98.5% ($400 billion) and 99.5% ($1200 billion), respectively. The reduced ambient PM2.5 exposure can also avoid 11.3 million cases morbidity globally by 2050s, due to asthma attacks and hospital admissions. Our study shows most of the economic benefits from air quality improvement due to China’s mitigation happens in China, followed by the eastern Asia (such as South Korea and Japan) and the rest of Asia. Health improvement is the main fraction of the potential benefits, such as saving health expenditure, increasing the work time.
Facing the dual challenges of air pollution and climate change, China has set ambitious goals and made decisive efforts to reduce its carbon emission and win the ‘Battle for Blue Sky’. However, how the low-carbon transition and air quality targets could be simultaneously achieved at the sub-national levels remains unclear. The questions arise whether province-level climate change mitigation strategies could help ease the air pollution and close the air quality gap, and how these co-benefits can be compared with the cost of the green transition. Here, using an integrated modeling framework, we combined with local air pollutant emission inventories and issued policy documents to quantitatively evaluated the current situation and targets of the air quality and health co-benefits of deep carbon mitigation in Sichuan, a fast-developing inland province in China. We found that by 2035, without system-wide energy transformation induced by carbon mitigation policies, the improvement in air quality in Sichuan Province might be limited, even under stringent end-of-pipe emission control measures. On the contrary, the co-benefits of low-carbon policies would be significant. On top of stringent end-of-pipe controls, the implementation of carbon mitigation policy in line with China’s enhanced climate target could further reduce the average PM2.5 concentration in Sichuan by as much as 2.8 µg m−3, or the population-weighted PM2.5 concentration by 5.9 µg m−3 in 2035. The monetized health co-benefits in Sichuan Province would amount to 23 billion USD under the stringent carbon mitigation scenario, exceeding 1.7 billion USD of the mitigation cost by 2035. The results indicate that significant air quality and health benefits could both be achieved from carbon mitigation at the provincial level. Both air-pollution or carbon-reduction oriented policies would be important for improving environmental quality and public health.
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