Erel O, BCIT School of Health Sciences, Environmental Health, Heacock H. The CO2 and PM2.5 levels in Downtown Vancouver at peak (5 p.m.) and off-peak (12 a.m.) hours. ephj [Internet]. 2014 May 5 [cited 2024 Nov. 21];. Available from: https://journals.bcit.ca/index.php/ehj/article/view/139