Ozone in sampling air can alter the chemical composition of collected ultrafine particles, leading to an inaccurate air quality assessment. We addressed this by developing a ceramic device coated with sodium thiosulfate that eliminates ozone before it reaches the filter. Our results show this tool effectively preserves ozone-sensitive components, such as polycyclic aromatic hydrocarbons, without particle losses. This contributes to more reliable data for air quality research.