GAW Report No. 205 - IGAC Project

CHAPTER 6 - EUROPEPiemonte (Turin): http://www.sistemapiemonte.it/ambiente/srqa/Lombardia (Milan): http://www.arpalombardia.it/qariaVeneto (Venice): http://www.arpa.veneto.it/aria_new/htm/qualita_aria.aspEmilia-Romagna (Bologna): http://www.arpa.emr.it/liberiamo/Friuli Venezia-Giulia (Udine): http://www.arpa.fvg.it/index.php?id=112Air quality data can also be downloaded from the National Environmental Protection Agency(ISPRA) central database BRACE (http://www.brace.sinanet.apat.it), where data are usually loadedwith a 1-2 years delay.Figure 27 - Comparison between sectors’ contribution to total emissions in Lombardy Region and Milan Metropolitan Area6.6.4 The status and trend of air pollutionThe main cities within the Po valley experience similar air quality problems with frequentexceedances of EC directives’ limit values for PM 10 during the winter and for ozone during thesummer. Non-attainment conditions are recorded for yearly averaged values of PM 10 and NO 2 .Examples of the air quality conditions experienced during the past decade are shown in Figures28-31. The yearly averages of NO 2 have values equal to or larger than 50 µg/m 3 with a very weakdeclining trend (Figure 28) at some stations. PM 10 concentrations are characterized by yearlyaverage concentrations above the limit threshold of 40 µg/m 3 (Figure 29) and a number ofexceedances of the daily average limit, often getting above 100 µg/m 3 (Figure 30). Stations locatedwithin urban parks (Parco Lambro) and around the urbanized area (Motta Visconti e Lacchiarella)show a large number of exceedances of the limit values for the ozone daily maximum of the 8 hoursrunning mean (Figure 31). Only stations located within the urban area (Juvara/Pascal) respect themaximum number of exceedances foreseen by EC directives during favourable years (2004-2006).The year 2003 summer heat wave caused much higher O 3 concentrations than all the followingyears.226