gps_timestamp GPS Timestamp in UTC
latitude      GPS position
longitude     GPS position
NO_ugm3       NO concentration in µg/m3
NO2_ugm3      NO2 concentration in µg/m3
O3_ugm3       O3 concentration in µg/m3
CO_mgm3       CO concentration in mg/m3
CO2_mgm3      CO2 concentration in mg/m3
PMch1_perL    PM channel 1 measurement in counts per litre
PMch2_perL    PM channel 2 measurement in counts per litre
PMch3_perL    PM channel 3 measurement in counts per litre
PMch4_perL    PM channel 4 measurement in counts per litre
PMch5_perL    PM channel 5 measurement in counts per litre
PMch6_perL    PM channel 6 measurement in counts per litre
PM25_ugm3     PM2.5 concentration in µg/m3