Comparison with Miravalle site was not possible due to technical problems, the values during DS2 at Miravalle are not statistically representative (n=4–7 per month), therefore November and December data are not plotted (see Table 1). In general, the daily diurnal pattern is a repetitive phenomenon that was also previously observed at different urban cities such as Mexico City (Eidels–Dubovoi, 2002), Fresno, CA (Chow et al., 2009) and Seoul and Kwangju, Korea (Park et al., 2002).