{"id":35918,"date":"2018-11-06T14:00:00","date_gmt":"2018-11-06T14:00:00","guid":{"rendered":""},"modified":"2020-05-14T18:48:02","modified_gmt":"2020-05-14T18:48:02","slug":"10918-is-china-targeting-the-wrong-chemical-in-effort-to-cut-winter-smog","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/pollution\/10918-is-china-targeting-the-wrong-chemical-in-effort-to-cut-winter-smog\/","title":{"rendered":"Is China targeting the wrong chemical in effort to cut winter smog?"},"content":{"rendered":"<p>If Beijing wants to tackle severe winter smog then&nbsp;it may have to adjust policies to account for formaldehyde, according to recent <a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2018GL079309\">research<\/a>.<\/p>\n<p>Chinese policymakers have typically thought that smog-causing particulate matter came from sulphates, prompting the government to target sulphur dioxide emissions in its ongoing crack-down on air pollution.<\/p>\n<p>But the new research, carried out jointly by scholars from Harvard, Tsinghua and Harbin Institute of Technology, finds air monitoring tools have confused sulphate with hydroxymethane sulphonate (HMS) &ndash; a chemical which is formed when formaldehyde and sulphur dioxide react. In other words, for years the role of formaldehyde in smog formation has been overlooked.<\/p>\n<p><strong>Tackling the wrong pollutant<\/strong><\/p>\n<p>&ldquo;This misidentification is important because the chemistry that creates HMS is dependent on levels of both formaldehyde and sulphur dioxide in the air,&rdquo; said&nbsp;Jonathon M Moch, an author of&nbsp;the report,&nbsp;which was published in the journal&nbsp;<em>Geophysical Research Letters&nbsp;<\/em>in October<em>.<\/em><\/p>\n<p>&ldquo;In the Beijing area, the limiting factor [when tackling air pollution] has usually not been sulphur dioxide but rather formaldehyde. In such situations, reducing sulphur dioxide emissions alone would not affect the levels of HMS in the atmosphere,&rdquo; added&nbsp;Moch.<\/p>\n<p>This also partially explains why China still suffers severe smog in winter&nbsp;despite years of passing regulation to tighten control of sulphur dioxide emissions. Last winter Beijing closed nearby factories and placed strict controls on the use of coal for winter heating. In 2016, authorities issued the <a href=\"https:\/\/www.chinadialogue.net\/blog\/9505-Beijing-issues-first-smog-red-alert-for-2-16\/en\">city&rsquo;s first &ldquo;red alert&rdquo;,<\/a> when PM2.5 readings were so high they were off the scale. But closing down factories only became effective once sulphur dioxide levels fell below those of formaldehyde.<\/p>\n<p>&ldquo;These controls also led to heating shortages in some areas,&rdquo; Moch said, &ldquo;and may therefore be difficult to maintain or replicate for other urban areas&rdquo;.<\/p>\n<p>The high price of Beijing&rsquo;s blue skies in winter last year was widely reported. Government&nbsp;projects to replace coal-burning for heat with <a href=\"https:\/\/dialogue.earth\/article\/show\/single\/ch\/10322-What-caused-China-s-squeeze-on-natural-gas-\">natural gas<\/a> or electricity ran into delays, leaving&nbsp;many people with <a href=\"https:\/\/www.sohu.com\/a\/208591930_391317\">heating shortages<\/a>. Beijing and Tianjin&nbsp;were just two areas where&nbsp;<a href=\"https:\/\/www.sohu.com\/a\/192394621_616825\">wide-ranging directives<\/a>&nbsp;were issued to <a href=\"https:\/\/www.sohu.com\/a\/168814449_99936602\">stop certain types of heavy industrial work<\/a>&nbsp;for months, such as road&nbsp;building, construction and demolition.<\/p>\n<p>Air pollution is a major challenge for low and middle-income nations, including China. On October 30 the first <a href=\"https:\/\/www.who.int\/airpollution\/events\/conference\/en\/\">WHO Global Conference on Air Pollution and Health<\/a> was held in Geneva, just after a new <a href=\"https:\/\/www.who.int\/ceh\/publications\/air-pollution-child-health\/en\/\">report<\/a> said 93% of the world&rsquo;s under-18 population (1.8 billion children) are exposed to air pollution that can cause health problems or early death. The report estimated&nbsp;that air pollution contributed to&nbsp;respiratory tract infections that resulted in the deaths of 600,000 children under 15. <a href=\"https:\/\/www.sohu.com\/a\/117318541_157348\">Research from Nanjing University<\/a> showed&nbsp;that in 2013 one third of deaths in 74 of China&rsquo;s major cities were linked to PM2.5 pollution.<\/p>\n<p>China tackles smog primarily by controlling the release of sulphur dioxide, nitrogen oxides and volatile organic compounds. These are seen as the main substances involved in the chemical reactions which create PM2.5 pollution.<\/p>\n<p>This has been somewhat successful. During the 12<sup>th<\/sup> Five-Year Plan (2011-2015) emissions of sulphur dioxide and nitrogen oxides dropped by <a href=\"https:\/\/www.gov.cn\/zhengce\/content\/2017-01\/05\/content_5156789.htm\">18% and 18.6%<\/a>, respectively. Under the latest 13<sup>th<\/sup> Five-Year Plan emissions of these two pollutants&nbsp; are expected to drop a further 15% on 2015 levels by 2020. But despite the huge efforts made, air pollution in northern China remains severe.<\/p>\n<p>A <a href=\"https:\/\/www.greenpeace.org\/international\/press-release\/19072\/greenpeace-analysis-of-new-satellite-data-reveals-worlds-biggest-no2-emissions-hotspots\/\">report from Greenpeace<\/a> last month showed that new satellite monitoring data located ten of the world&rsquo;s 50 largest sources of nitrogen dioxide in China. And as the winter heating season approaches, observers are worried northern China will suffer smog again.<\/p>\n<p><strong>A new direction<\/strong><\/p>\n<p>The Harvard report may offer a new option. Formaldehyde emissions come predominantly from transportation, the chemical industry and oil refining. There are many such sources in Beijing and the surrounding area which could be dealt with.<\/p>\n<p>&ldquo;The new work from Harvard suggests that in order to reduce extreme haze in Beijing, policymakers should focus their efforts on reducing emissions of formaldehyde,&rdquo; said Moch. &ldquo;In eastern China, this would mean focusing on cars and trucks as well as oil and chemical refineries, the major sources of formaldehyde.&rdquo;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Formaldehyde&#39;s role in the formation of air pollution has been overlooked for years<\/p>\n","protected":false},"author":2265,"featured_media":60227,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[760],"tags":[514,551],"hashtags":[],"country":[],"class_list":["post-35918","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pollution","tag-chemicals","tag-health"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Is China targeting the wrong chemical in effort to cut winter smog? | Dialogue Earth<\/title>\n<meta name=\"description\" content=\"Formaldehyde&#039;s role in the formation of air pollution has been overlooked for years\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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