NOx emissions compared to the reduction in speed from 50 to 30 km/h Wiesbaden, Goe, 02.11.18 Wiesbaden authorities believe with an intelligent, ampel-controlled regulation ( Digi-V) on a approx. 1.0 km long road (‘Schiersteiner Str.’), which has 4 traffic lights to reduce the emission of pollutants. Can work if not s. below. In addition, however, a temporary reduction from 50 to 30 km/h with o.g. control would also reduce the damage Is not the time factor forgotten in these reduction models? At 30 km/h the car is on a road longer than at 50 km/h. This also causes more pollutants that have to be included in the overall balance? P. below. On the Internet the proponents of the speed 30 approach prevail, but did you take the time factor into account? ADAC and ‘Motor Talk’ deny the emission reduction. Who is right? 1. Assumptions; according to research H. W., p. 5, Berliner Unter search of ? the mean value of the silver stone, shield horn and Beussel str. is used for speed 50 and 30 km/h. 30 km/h in micro-g/m3 30 km/h in micro-g/m3 34,6 29,3 2. Formula: speed(Km/h) = path(Km): time(h), dissolved by time = path : speed t = 1 : 30 = 0.033 h t = 1 : 50 = 0.02 h difference = 0.013 h ratio : 0.02 : 0.33 = 60 % 3. emissions with 30 km/h output at 50 km/h 0.033 (t 30 km) + 0.013 (t difference to 50 km) 0.046 x 29.3 = 1.3478 micro -g/m3 0.02 x 34.6 = 0.693 micro-g/m3 + 51 % ?