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. 2018 Jul 23;8(7):e020425. doi: 10.1136/bmjopen-2017-020425

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© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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The percentage change in daily IS counts and daily IS deaths with an IQR increase in air pollutant levels on different lag days in single-pollutant models in Changzhou, 2015–2016. The data are expressed as the mean with a 95% CI. CO, carbon monoxide; IS, ischaemic stroke; NO₂, nitrogen dioxide; PM_2.5, particulate matter <2.5 µm in diameter; PM₁₀, particulate matter <10 µm in diameter; SO₂, sulfur dioxide.