| Sumario: | Exposure to fine particulate matter (PM2.5) is associated with a broad range of health risks. This study assessed the impacts of cooking smoke and environmental tobacco smoke on air quality at outdoor community events in Edmonton, Alberta (Canada). Data were collected at three festivals in July–August 2011 using a portable real-time airborne particle monitor. The pooled mean PM2.5level was 12.41 μg/m3. Peak readings varied from 52 to 1877 μg/m3. Mean PM2.5near food stalls was 35.42 μg/m3, which exceeds the WHO limit for 24 h exposure. Mean PM2.5levels with smokers present were 16.39 μg/m3(all points) and 9.64 μg/m3(excluding points near food stalls). Although some smokers withdrew from common spaces, on average 20 smokers/hour were observed within 3 m. Extending smoking bans would improve air quality and address related concerns. However, food preparation is a more pressing area for policy action to reduce PM2.5exposure at these community events.
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