2024 Yes Evaluation of the Relationship between Fractional Exhaled Nitric Oxide (FeNO) with Indoor PM10, PM2.5 and NO2 in Suburban and Urban Schools https://www.mdpi.com/1660-4601/19/8/4580 Isa, Khairul Nizam Mohd Asia Epidemiological Students Middle/Jr High (6-8) Carbon Dioxide (CO2) Particulate Matter (PM) Temperature Humidity Fungi Respiratory symptoms Feno School children Urban suburban indoor pollutants A study of 470 students in Malaysia found PM2.5 and NO₂ were significantly associated with elevated FeNO in both suburban and urban schools. Results support the role of indoor air pollutants in school environments affecting airway inflammation in children. 2022