The Study on the Situation of Indoor Air Quality at the Port of Entry in Chiang Mai International Airport, 2023 – 2025

Abstract

Port Health and Quarantine, Chiang Mai International Airport, has a mission to prevent and monitor communicable diseases in international travelers. Inadequate air quality can affect personnel and travelers Inadequate air quality can affect personnel and travelers at the Port of Entry in Chiang Mai International Airport. This study is a cross-sectional descriptive study aimed to investigate the air quality situation at the Port of Entry in Chiang Mai International Airport, 2023 - 2025. The instruments used for measurement were an indoor air quality meter and a real-time dust meter. The parameters measured included carbon dioxide (CO₂), carbon monoxide (CO), temperature, relative humidity, formaldehyde (CH₂O), ozone gas (O₃), volatile organic compounds (VOCs), PM2.5 dust, PM10 dust, total suspended particulates, total bacteria count, and total fungal count. Data were analyzed using descriptive statistics. The study found that the levels of carbon dioxide and formaldehyde at the Port of Entry in Chiang Mai International Airport tended to meet the standards less frequently. The percentage of carbon dioxide levels meeting the standard decreased from 100.00% in 2023 to 66.67% and 33.33% in 2024 and 2025, respectively. The percentage of formaldehyde levels meeting the standard decreased from 100.00% in 2023 and 2024 to 66.67% in 2025. Considering the parameters that met the standards, carbon monoxide, total bacteria count, and total fungal count met the standards most frequently over the three years, at 100.00%. The parameters that pass the standards least frequently were temperature, PM2.5 dust, and PM10 dust, at 0.00%, 33.33%, and 37.04%, respectively. Therefore, the environment should be adjusted to be suitable for work and traveler services using a four-pronged approach: 1) legal aspects 2) determining measures 3) management and 4) preventive maintenance.