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Three B.C. cities were among the worst regions in the world for air pollution last summer thanks to thick smoke that choked the province during the wildfire season, according to an annual Greenpeace report.

Overall, B.C. and Canada aren’t among the world’s top air-polluters cited in the 2018 World Air Quality Report.

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However, when broken down by month, B.C. made the top 10 list in August because of the smoke from the worst wildfire season on record. Smoke from fires in Washington state and Oregon also contributed to the poor air quality.

The report uses PM2.5 as a measure of air pollution. PM2.5 refers to particulate matter that measures up to 2 1/2 microns in size, and is regarded as the pollutant with the most adverse health impacts.

Quesnel and Prince George had air-quality readings in August that put them at Nos. 7 and 9 on the list for that month, with readings of 74.2 and 72.2, respectively. At No. 13, Williams Lake, with a reading of 67, also featured among the 20 worst in the world in August 2018.