Figure 2From: Mobile air quality studies (MAQS) in inner cities: particulate matter PM10 levels related to different vehicle driving modes and integration of data into a geographical information program PM 10 values within the Environmental Zone in different vehicle conditions and levels of significance. Position of measurements within 15 intervals each of approximately 28 minutes between 10 a.m. and 5p.m.;RO = roof open, RCWO = roof closed and window open, RCWC = roof closed and window closed. a-c: direction West to East, d-f: direction East to West. Geographical picture by Google EarthBack to article page