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      Call for comments: climate and clean air responses to covid-19


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          Much of the world is seeing significant reductions in many air pollutant and greenhouse gas emissions due to efforts to stem the covid-19 pandemic (Han et al. 2020; He et al. 2020). This is a stark confirmation of the contribution of our everyday activities to sources of emissions of the air pollutants that we breathe and the greenhouse gases that drive global warming. The speed with which emissions have fallen shows how quickly we can improve our environment when motivated and how vulnerable we are living in degraded environments. It is important to recognize that these changes are not unexpected. Similar decreases in air pollution and greenhouse gas emissions have occurred due to short-term events such as clean air policies put in place for the 2008 Beijing Olympics, and the 2008–2009 global recession (Castellanos and Boersma 2012; Tong et al. 2016) as well as from long-term air quality management policies (Dedoussi et al. 2020). As with previous shocks, we know that pollution continues to occur even with significant government-imposed constraints. For example, pollutants from transport and industrial sectors have decreased but not from residential or agricultural sources. Moreover, some pollutants, like ozone, result from secondary atmospheric processes resulting in nonlinear links between reduced emissions and ambient concentrations (Wang et al. 2020). While these decreases result in public health benefits from improved air quality, they come at the unacceptable cost of thousands of deaths, rapidly increasing unemployment, and staggering economic dislocation. And, at the individual level, some families may be exposed to even greater pollution levels (e.g. from increased open-burning cookstove meals) during the lockdown. There is also much we are continuing to learn about potential links between exposure to poor air quality and vulnerability to the impacts of covid-19 as well as other important socio-economic aspects which could increase vulnerability. However, there is already strong evidence that for respiratory infections in general (Mehta et al. 2013), air pollution worsens their severity, with some evidence of an interaction from SARS (Cui et al. 2003) as well as emerging studies on the air pollution and covid-19 (Wu et al. 2020). Given that economic activity has already re-started while the pandemic is still underway, it is more than prudent to consider improved air quality as an additional measure to help reduce the burden placed on healthcare systems. As our understanding of these links improve, it will give us even greater motivation to commit to long-term sustainable energy and environmental policies. Despite the acute challenge of this global pandemic, we cannot allow it to compromise our efforts to tackle the world’s inescapable, linked, and ongoing challenges of climate change, poor air quality, unsustainable development, and the loss of biodiversity. As was the case with past shocks, current emissions reductions are not sustainable and will return to pre-event levels unless we use the emergence from the economic downturn as an opportunity for transformational change (Peters et al. 2012). How we decide to stimulate the economy in response to the covid-19 virus can have enormous impacts on these longstanding global threats. As governments apply economic stimulus efforts, it is more important than ever that these make the connection between health, air pollution, climate, and the environment. By addressing climate, air pollution, and sustainable development as an integrated problem, we can identify technologies, lifestyle changes, and policy solutions which achieve multiple near-term benefits efficiently, sustainably, and often at lower cost than solutions that no not consider both the economy and the environment. This has always been the core message of the Climate and Clean Air Coalition. Many people in the world, some for the first time, are inadvertently experiencing what it is like to live with clean air; this benefit does not have to come at the expense of our security and economic future. We identified many of the solutions that deliver economic and social objectives while simultaneously protecting our air and climate. These include investing in: development, deployment, and integration of clean renewable energy instead of fossil fuels, ensuring equitable and affordable access for all; measures which reduce short-lived climate pollutants such as addressing emissions from the burning or collection of municipal solid waste; these measures are often low/no-cost, and quickly achieve multiple near-term economic, public health, and social benefits; policies and regulations which improve indoor air quality by incentivizing energy access and energy efficiency of buildings and appliances; preserving our forests and other natural sinks, as well as in expanding them; sustainable food systems, reduced food waste, and the promotion of healthy diets; a more local, circular, and low-carbon economy incentivising safe reuse, remanufacturing, and recycling of products; more resource efficient, sustainable, and resilient supply chains; sustainable transport systems including encouraging active travel, work from home, and implementing policies to reduce daily commuting and reducing business travel; invest in knowledge institutions, especially in the Global South, to strengthen their capability to produce high quality and context relevant analyses and build the requisite human resources. Right now, policymakers and leaders are looking for clear guidance on how to build back quickly from this pandemic and create resilient conditions in our communities and societies to avoid future economic recessions. To act they need concrete examples and supporting information about the transformations and investments needed to reduce emissions while stimulating the economy. We are issuing a call to the global scientific and policy community to come together and provide the guidance and evidence to, not just build back, but Build Back Better. Additional questions What role might air quality and climate policy, including short-lived climate pollutant policy, play in the recovery plans following the pandemic, including plans to speed the economic recovery? What are the similarities and the difference between the pandemic and the risk from climate impacts, including the importance of being prepared for the risk and taking precautionary measures in advance of impacts; the nonlinear nature of both risks; and the potentially catastrophic consequences for society, including our social, civic, and economic systems? What can we learn from the communication of the respective risks of the pandemic, climate, and air quality impacts? The virus requires physical distancing and a radical alteration of our everyday social, economic, and political lives, but it is also showing us how closely interconnected we are. We can now see, both as individuals and as a society, how capable we are of making major changes, if the safety and sustainability of our society is at stake. What can we learn from the response to covid-19, and previous shocks, which we can use for action on climate and air pollution?

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          Most cited references 9

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          Severe air pollution events not avoided by reduced anthropogenic activities during COVID-19 outbreak

          Due to the pandemic of coronavirus disease 2019 in China, almost all avoidable activities in China are prohibited since Wuhan announced lockdown on January 23, 2020. With reduced activities, severe air pollution events still occurred in the North China Plain, causing discussions regarding why severe air pollution was not avoided. The Community Multi-scale Air Quality model was applied during January 01 to February 12, 2020 to study PM2.5 changes under emission reduction scenarios. The estimated emission reduction case (Case 3) better reproduced PM2.5. Compared with the case without emission change (Case 1), Case 3 predicted that PM2.5 concentrations decreased by up to 20% with absolute decreases of 5.35, 6.37, 9.23, 10.25, 10.30, 12.14, 12.75, 14.41, 18.00 and 30.79 μg/m3 in Guangzhou, Shanghai, Beijing, Shijiazhuang, Tianjin, Jinan, Taiyuan, Xi'an, Zhengzhou, Wuhan, respectively. In high-pollution days with PM2.5 greater than 75 μg/m3, the reductions of PM2.5 in Case 3 were 7.78, 9.51, 11.38, 13.42, 13.64, 14.15, 14.42, 16.95 and 22.08 μg/m3 in Shanghai, Jinan, Shijiazhuang, Beijing, Taiyuan, Xi'an, Tianjin, Zhengzhou and Wuhan, respectively. The reductions in emissions of PM2.5 precursors were ~2 times of that in concentrations, indicating that meteorology was unfavorable during simulation episode. A further analysis shows that benefits of emission reductions were overwhelmed by adverse meteorology and severe air pollution events were not avoided. This study highlights that large emissions reduction in transportation and slight reduction in industrial would not help avoid severe air pollution in China, especially when meteorology is unfavorable. More efforts should be made to completely avoid severe air pollution.
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            Rapid growth in CO2 emissions after the 2008–2009 global financial crisis

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              Exposure to air pollution and COVID-19 mortality in the United States

              Background: United States government scientists estimate that COVID-19 may kill between 100,000 and 240,000 Americans. The majority of the pre-existing conditions that increase the risk of death for COVID-19 are the same diseases that are affected by long-term exposure to air pollution. We investigate whether long-term average exposure to fine particulate matter (PM 2.5 ) increases the risk of COVID-19 deaths in the United States. Methods: Data was collected for approximately 3,000 counties in the United States (98% of the population) up to April 04, 2020. We fit zero-inflated negative binomial mixed models using county-level COVID-19 deaths as the outcome and county level long-term average of PM 2.5 as the exposure. We adjust by population size, hospital beds, number of individuals tested, weather, and socioeconomic and behavioral variables including, but not limited to obesity and smoking. We include a random intercept by state to account for potential correlation in counties within the same state. Results: We found that an increase of only 1 μg/m 3 in PM 2.5 is associated with a 15% increase in the COVID-19 death rate, 95% confidence interval (CI) (5%, 25%). Results are statistically significant and robust to secondary and sensitivity analyses. Conclusions: A small increase in long-term exposure to PM 2.5 leads to a large increase in COVID-19 death rate, with the magnitude of increase 20 times that observed for PM 2.5 and all-cause mortality. The study results underscore the importance of continuing to enforce existing air pollution regulations to protect human health both during and after the COVID-19 crisis.

                Author and article information

                Int J Public Health
                Int J Public Health
                International Journal of Public Health
                Springer International Publishing (Cham )
                26 May 2020
                : 1-4
                [1 ]Organization for Economic Co-operation and Development, Paris, France
                [2 ]GRID grid.75276.31, ISNI 0000 0001 1955 9478, International Institute for Applied Systems Analysis, ; Laxenburg, Austria
                [3 ]GRID grid.9486.3, ISNI 0000 0001 2159 0001, Universidad Nacional Autónoma de México, ; Mexico City, Mexico
                [4 ]Climate and Clean Air Coalition, Paris, France
                [5 ]GRID grid.17091.3e, ISNI 0000 0001 2288 9830, School of Population and Public Health, , University of British Columbia, ; Vancouver, Canada
                [6 ]New Zealand Agricultural Greenhouse Gas Research Centre, Palmerston North, New Zealand
                [7 ]GRID grid.425957.8, ISNI 0000 0004 4909 9013, Stockholm Environment Institute, ; York, UK
                [8 ]GRID grid.8991.9, ISNI 0000 0004 0425 469X, London School of Hygiene and Tropical Medicine, ; London, UK
                [9 ]GRID grid.464259.8, ISNI 0000 0000 9633 0629, Energy Research Institute, , National Development and Reform Commission, ; Beijing, China
                [10 ]GRID grid.416786.a, ISNI 0000 0004 0587 0574, Swiss Tropical and Public Health Institute, ; Bern, Switzerland
                [11 ]UN Environment Programme, Nairobi, Kenya
                [12 ]GRID grid.83440.3b, ISNI 0000000121901201, Department of Science, Technology, Engineering and Public Policy, , University College London, ; London, UK
                [13 ]GRID grid.266100.3, ISNI 0000 0001 2107 4242, Scripps Institution of Oceanography, , University of California San Diego, ; La Jolla, USA
                [14 ]GRID grid.47894.36, ISNI 0000 0004 1936 8083, Department of Atmospheric Science, , Colorado State University, ; Fort Collins, USA
                [15 ]GRID grid.26009.3d, ISNI 0000 0004 1936 7961, Nicholas School of the Environment, , Duke University, ; Durham, USA
                [16 ]GRID grid.412434.4, ISNI 0000 0004 1937 1127, Faculty of Public Health, , Thammasat University, ; Bangkok, Thailand
                © Swiss School of Public Health (SSPH+) 2020

                This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.


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