The datasets include data collected by time activity diaries (TAD) in the form of questionnaires from each participant of the city campaigns in Athens, Thessaloniki, Madrid, Milan, Brno, Basel and Ljubljana. The questionnaires were digitized in excel format to match the sensors data. The information the time activity diaries provided relates to the type and the place of an activity the participant performs in a specific time frame. The activity (resting, playing, sleeping, sports, cooking, smoking, cleaning, running) can be indoor or outdoor, the participant can be in transit using public or personal means of transportation (bus, car, motorbike, bicycle, foot, other). Also, information regarding the house conditions (candles on/off, air conditioning – fan on/off, fireplace, windows open/closed) is also provided. All the data collected through the TAD surveys are stored in the open repository in different subfolders named according to the city where the data were collected and in further two subfolders named according to the season when the data was collected (“WINTER” and “SUMMER”). Single files encompassing the data measured are named according to the following scheme: City_Season_ParticipantID.xlsx (e.g. ATH_S_P032.xlsx). The anonymized data is stored in MS Excel xls and xlsx formats to maximise the potential for use with a variety of analytical software.