2024 No Indoor air quality in inner-city schools and its associations with building characteristics and environmental factors https://doi.org/10.1016/j.envres.2018.12.012 Majd, Ehsan North America Exposure Observational Students Elementary (K-5) Middle/Jr High (6-8) Particulate Matter (PM) Carbon Monoxide (CO) Nitrogen Dioxide (NO2) Other Indoor air quality School Exposure Building characteristics Environmental factors PM2.5, NO2, and CO were measured in 16 urban U.S. schools across seasons. Indoor concentrations often exceeded guidelines. Building defects and nearby pollution sources were linked to poor IAQ. Results support school facility improvements. 2019