LAUSR

Abstract Ground-level ozone (O3) is an atmospheric pollutant of concern owing to its impacts on both human and environmental health. In southern Ontario, Canada, air pollutants (including O3) are continuously monitored through a network of active monitoring stations; however, these stations are largely located in urban areas. Passive samplers for O3 and NO2 were deployed at 24 sites throughout the Sandbanks Provincial Park, on the shore of Lake Ontario during the summer of 2016 to assess the influence of lake-breeze circulation on air quality. Average O3 measured at the park (39.4 ppb) was higher than inland sites at Belleville (32.6 ppb) and Peterborough (30.0 ppb). A negative-linear relationship (R2 = 0.71) was observed between O3 concentration and distance from shore (