Sulphur dioxide (SO2) is a colourless gas with a pungent odour that smells like a struck match. Once released, SO2 can react with other pollutants to form fine particulate matter.
What are the levels? posted on 9:49 AM, June 7, 2016
The highest observed concentration of SO2 in Kamloops in a one-hour period in 2015 was 10 ppb (source: BC Lung Association). Guidelines for SO2 from provincial air quality objectives are 75 ppb, observed as the annual 99th percentile of daily one-hour maximum observed.