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. Summer surface O3 pollution has rapidlyintensified in China in the recent decade, damaging human and ecosystemhealth. In 2017, the summer mean maximum daily average 8 h concentration ofozone was greater than 150  µ g m −3 in NorthChina. Based on the close relationships between the O3 concentration and the meteorological conditions, a daily surface O3 weather index was constructed, which extends the study period to thehistorical period before 2007 and the projected future. Here, we show that inaddition to anthropogenic emissions, the Eurasian teleconnectionpattern (EU), a major globally atmospheric teleconnection pattern, influencessurface O3 pollution in North China on a timescale of climate. Thelocal meteorological conditions associated with the EU positive phasesupported intense and efficient photochemical reactions to produce moresurface O3 . The associated southerlies over North China transportedsurrounding O3 precursors to superpose local emissions. Increasedsolar radiation and high temperatures during the positive EU phasedramatically enhanced O3 production. Furthermore, due to the closeconnection between the preceding May Arctic sea ice (SI) and summer EUpattern, approximately 60 % of the interannual variability in O3 -related weather conditions was attributed to Arctic sea ice tothe north of Eurasia. This finding will aid in understanding the interannualvariation in O3 pollution, specifically the related meteorologicalconditions.

Links of climate variability in Arctic sea ice, Eurasian teleconnection pattern and summer surface ozone pollution in North China