Madrid air pollution data, to predict pollution alerts 4 days in advance. Each row represents a day in central Madrid including features about: NO2 air levels, weather, traffic information with the objective field pollution "YES/NO". The objective field has been defined using Madrid local government pollution alerts definition. Contains data from 2013 to 2017.

Air: https://datos.madrid.es/portal/site/egob/menuitem.c05c1f754a33a9fbe4b2e4b284f1a5a0/?vgnextoid=f3c0f7d512273410VgnVCM2000000c205a0aRCRD&vgnextchannel=374512b9ace9f310VgnVCM100000171f5a0aRCRD&vgnextfmt=default

Weather: https://datosclima.es/Aemet2013/Datosporestacion.html

Traffic: https://datos.madrid.es/portal/site/egob/menuitem.c05c1f754a33a9fbe4b2e4b284f1a5a0/?vgnextoid=33cb30c367e78410VgnVCM1000000b205a0aRCRD&vgnextchannel=374512b9ace9f310VgnVCM100000171f5a0aRCRD&vgnextfmt=default