the_geom road segment linestring osm_id OSM road ID osm_code OSM code osm_fclass OSM fclass / road-type osm_name OSM road name osm_ref OSM road ref osm_oneway OSM road metadata osm_maxspeed OSM road metadata osm_layer OSM road metadata osm_bridge OSM road metadata osm_tunnel OSM road metadata NO2points number of measurements on this road segment NO2drives number of drive passes on this road segment NO2_ugm3 NO2 concentration (median of drive pass mean) in µg/m3 NOpoints number of measurements on this road segment NOdrives number of drive passes on this road segment NO_ugm3 NO concentration (median of drive pass mean) in µg/m3 CO2points number of measurements on this road segment CO2drives number of drive passes on this road segment CO2_mgm3 CO2 concentration (median of drive pass mean) in mg/m3 COpoints number of measurements on this road segment COdrives number of drive passes on this road segment CO_mgm3 CO concentration (median of drive pass mean) in mg/m3 O3points number of measurements on this road segment O3drives number of drive passes on this road segment O3_ugm3 O3 concentration (median of drive pass mean) in µg/m3 PM25points number of measurements on this road segment PM25drives number of drive passes on this road segment PM25_ugm3 PM2.5 concentration (median of drive pass mean) in µg/m3