Results of O3 monitoring support the findings of Kuttler and Strasburg (1999) and Nowak et al. (2006), that urban parks can increase O3 levels. This phenomenon is more pronounced during the summer due to high solar radiation. In the case of Tel-Aviv, it seems that O3 concentration levels shifted the level of health concern in the urban park to a “Medium”, but this event was limited for one or two hours during midday. Using the AQI can offer a holistic view of the overall impact of the urban park on air quality. As demonstrated in Table 4 (winter), where the reduction of NOx PM10, and CO concentrations in the urban park is the most significant, the LHC in the park is defined as “Low” nearly all the time, while in the street canyon it is defined as “Medium” and “High” and in the urban square it is defined as “Medium” most of the time and “Low” for several hours only. During the summer (Table 5), LHC in the street canyon is defined as “Medium” from morning to evening and as “Low” during the nighttime, LHC in the urban square and in the urban park is similar most of the time and defined as “Low”, except during midday, when the “Medium” LHC definition in the urban park lasts more hours than in the urban square, due to higher O3 levels. It seems that the positive impact of the urban park on AQI values during the winter is much more significant especially when pollutant levels are high, than its negative effect during the summer when pollutant levels are low. Results of noise monitoring showed that vegetation barriers such as urban parks can attenuate noise levels by 4e5 dB(A) in comparison to noise attenuation in urban open squares (Fig 4). This finding supports an extra reduction of 2e4 dB(A) by the vegetation as recorded by Papafotiouet al. (2004) and assessed by Blond and Hun hammer (1999).