Figure 1: Box-whiskers plots of outdoor and indoor ozone measurements during daytime A (morning) taken in 29 dwellings in Athens depicted as a function of the dwelling floor (Ground floor=0, First floor=1, Second floor=2, Third floor and above=3). The following color code has been used: Black (outdoor ozone), Red (indoor ozone with openings open for 30 min - In0b, In1b, In2b, In3b), Blue (indoor ozone with openings closed for 15 min - In0c, In1c, In2c, In3c), Purple (indoor ozone with openings closed for 30 min – In0d, In1d, In2d, In3d).