Erel, Oguz, BCIT School of Health Sciences, Environmental Health, and Helen Heacock. “The CO2 and PM2.5 Levels in Downtown Vancouver at Peak (5 p.m.) and off-Peak (12 a.M.) Hours”. BCIT Environmental Public Health Journal (May 5, 2014). Accessed April 19, 2024. https://journals.bcit.ca/index.php/ehj/article/view/139.