Air quality data from sensor kits in CoMobility schools (COMOB-A)

COMOB-A_Air_Quality_raw_data_with_flags is associated with the data collected by the air quality sensor kits - Airly. These sensor kits were deployed near three schools to measure three components: PM, NO2, and O3. Each school had two sensors nearby, totaling six sensors across the three locations. The collected data underwent quality control procedures and are flagged accordingly to denote their reliability and accuracy. COMOB-A_Air_Quality_PM25_corrected is associated with the corrected PM2.5 data collected by the air quality sensor kits - Airly. The process involved several steps to ensure data accuracy. Initially, raw data from the sensors, as stored in the "AQ_Sensors_QC_Flags" table, underwent thorough quality control checks. Measurements failing any of these checks were removed from the analysis. Subsequently, the raw data from the two sensors located near each school were averaged to derive a single representative value. This average value was then corrected using data from nearby reference stations. This correction method compensated for any discrepancies in gain and offset inherent in the low-cost air quality sensors.COMOB-A_Air_Quality_O3_corrected is associated with the Ozone (O3) data collected and corrected by the air quality sensor kits - Airly. The process involved several steps to ensure data accuracy. Initially, raw data from the sensors, as stored in the "AQ_Sensors_QC_Flags" table, underwent thorough quality control checks. Measurements failing any of these checks were removed from the analysis. Subsequently, the raw data from the two sensors located near each school were averaged to derive a single representative value. This average value was then corrected using data from nearby reference stations. This correction method compensated for any discrepancies in gain and offset inherent in the low-cost air quality sensors.COMOB-A_Air_Quality_NO2_corrected is associated with the NO2 data collected and corrected by the air quality sensor kits - Airly. The process involved several key steps to ensure data accuracy. Initially, raw data from the sensors underwent quality control checks, as recorded in the "AQ_Sensors_QC_Flags" table. Any measurements failing these checks were subsequently excluded from further analysis. Following quality control, the raw sensor data underwent correction procedures using nearby NO2 diffusive samplers.