This study investigated radon, PM_2.5, and PM₁₀ concentrations in two residences in Chiang Mai, Thailand, during the highest burning period to assess their potential impacts on public health. The selected houses represented contrasting scenarios: House 1 (H1) was associated with a reported case of lung cancer, while House 2 (H2) had no such reported history. Measurements revealed that the indoor radon concentration at H1 (52±23 Bq m^-3) exceeded the global average of 40 Bq m^-3, although it remained below the World Health Organization’s recommended limit of 100 Bq m^-3. In contrast, H2 exhibited a lower radon concentration (21±14 Bq m^-3). Significantly higher concentrations of both indoor and outdoor PM_2.5 and PM₁₀ were observed at H1 compared to H2, potentially attributable to factors such as building materials, ventilation practices, and proximity to pollution sources. A strong positive correlation between PM_2.5 and PM₁₀ concentrations was observed in both houses, suggesting that these may originate from similar sources. These findings underscore the importance of continuous monitoring and targeted interventions to mitigate potential health risks associated with exposure to radon and airborne particulates in specific locations.

A joint seminar was held at the Graduate School of Health Sciences of Hirosaki University on 18 and 19 July 2023 with Hirosaki University (Institute of Radiation Emergency Medicine, Graduate School of Health Sciences and the Radiation Emergency Medicine and Cooperation Promotion), the Korea Institute of Radiological and Medical Science (KIRAMS) and Chang Gung Memorial Hospital (CGMH), Taiwan. Hirosaki University has held six joint research seminars with KIRAMS, and this year’s seminar was held with of ficials from CGMH, the main institution in Taiwan for radiation emergency medicine. The most recent three years were online-only due to the COVID-19 pandemic, but this year the meeting was held face-to-face, with six participants from KIRAMS and three officials from CGMH. It was the first time in three years that we were able to hold a face-toface seminar, and the two-day event reaffirmed the importance of mutual collaboration and gave us hope that we can further expand the scope of our cooperation. This report introduces an overview of the joint seminar as well as presentations on the main themes of each of the organizations.