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. 2020 Aug 20;10(8):e035798. doi: 10.1136/bmjopen-2019-035798

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Timeline of measurement campaign. Weekly measurements consist of continuous (PM_2.5 air concentration, noise levels, meteorological conditions, audio, and imagery) and integrated (PM_2.5 and NO_x concentration) samples. We chose weekly integrated samples for PM_2.5 and NO_x for logistical reasons (cost and time) as well as lessons from a previous study that showed relatively high temporal correlation between daily measurements.⁸