Consideration of the Improved Measurement Methods of Atmospheric Ozone Concentration by Passive Samplers

Abstract

From April 2018 to March 2020 at the Niigata-Maki national acid deposition monitoring station, passive samplers for monitoring ozone were put with different types of rain shelters (with/without windbreak board at the bottom), and ozone concentrations by passive samplers were compared with those by the air pollutant monitor and also between each shelter. As a result, ozone concentrations were significantly different both between passive samplers in each shelter, and between passive samplers and the air pollutant monitor, and the difference of the latter showed correlation to wind speed. A new formula was devised for ozone concentration calculation that included wind speed as a parameter, and with this formula, the difference of ozone concentrations mentioned above became smaller. Through wind-tunnel simulation experiments, it was shown that the vertical component of wind strongly affected air movement in shelters, which suggested it might also affect monitoring by passive samplers.