2022 Yes https://doi.org/10.1007/s11111-022-00401-4 Keivabu, Risto Conte Europe Epidemiology Study Modeling Students Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Particulate Matter (PM) Volatile Organic Compounds (VOCs) Nitrogen Dioxide (NO2) Absenteeism Air pollution Children Socioeconomic inequalities Environmental policy Used difference-in-differences on London school data (2012–2019) to assess air quality and absences after congestion zone policy. Absenteeism fell in high–low-SES schools where NO₂, PM, benzene dropped. Targeted traffic policy may reduce pollution-related attendance gaps.