2017 Yes https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5295350/ Zhong, Lexuan North America Exposure Study Modeling Elementary (K-5) Volatile Organic Compounds (VOCs) Volatile organic compounds (VOCs) Formaldehyde School Indoor/outdoor (I/O) ratio Air change rate (ACH/AER) High performance Aromatics, alkanes and terpenes were the major compound groups detected. Most VOCs had mean concentrations below 5 µg/m3, and most indoor/outdoor concentration ratios ranged from one to 10. For 16 VOCs, the within-school variance of concentrations exceeded that between schools and, overall, no major differences in VOC concentrations were found between conventional and high performance buildings. While VOC concentrations have declined from levels measured in earlier decades, opportunities remain to improve indoor air quality (IAQ) by limiting emissions from building-related sources and by increasing ventilation rates.