About the serious problem of particulate matter which causes heavy air pollution in cities of the Veneto plain, but also in mountain towns like Feltre following is a summary of research carried out by the journalistic CNR (National Research Council). Note that in some countries of central and northern Europe to fight air pollution are in place restrictions on the traffic not only time but also on speed. And our scientists CNR prove it.
We should consider whether to implement this initiative in Veneto.
---- the news - February 2011 taken from various news agencies ----
The CNR: smog fighting to 80, not 30 hour
«Lower speed limits to reduce pollution makes sense if you wear them around 80 km / h, which is the ideal speed for the engines. Below this threshold, particularly for speeds around 30 km per hour, you must balance between the benefits and disadvantages resulting from the increase of traffic jams. " So Nicola Pirrone, director of Air Pollution of the CNR, said operations in Italy and abroad, were taken to reducing the speed limit to fight smog.
"Studies over the past 10 years - said Pirrone - have indicated that reducing the speed of vehicles will reduce NOx and primary PM10. In particular the speed of 80 km / h is the best option for reducing emissions, if it is increased to 130 km / h to grow 3-4 times the primary PM10 and nitrogen oxides. " These, remember, are harmful in that they give rise, after a series of chemical reactions, secondary to PM10, which is equal to 30-40% of total PM10. But
reduce the speed, adds Pirrone, it is also useful for reducing the emitted particles for the wear of the road and the car with the brakes, the mechanical parts and the tires wear out: the total dust emitted is 30-40% of the total. It is however also in this case the principle that 80 km / h is the optimal speed. To reduce smog, according to the expert, the speed is not that one of the tricks that you can take, as well as instantaneous. "We need structural interventions - stresses - such as the scrapping of old boilers and cars up to € 3, supervise the burning biomass stoves and fireplaces, and reduce the temperature of heating homes."
«Lower speed limits to reduce pollution makes sense if you wear them around 80 km / h, which is the ideal speed for the engines. Below this threshold, particularly for speeds around 30 km per hour, you must balance between the benefits and disadvantages resulting from the increase of traffic jams. " So Nicola Pirrone, director of Air Pollution of the CNR, said operations in Italy and abroad, were taken to reducing the speed limit to fight smog.
"Studies over the past 10 years - said Pirrone - have indicated that reducing the speed of vehicles will reduce NOx and primary PM10. In particular the speed of 80 km / h is the best option for reducing emissions, if it is increased to 130 km / h to grow 3-4 times the primary PM10 and nitrogen oxides. " These, remember, are harmful in that they give rise, after a series of chemical reactions, secondary to PM10, which is equal to 30-40% of total PM10. But
reduce the speed, adds Pirrone, it is also useful for reducing the emitted particles for the wear of the road and the car with the brakes, the mechanical parts and the tires wear out: the total dust emitted is 30-40% of the total. It is however also in this case the principle that 80 km / h is the optimal speed. To reduce smog, according to the expert, the speed is not that one of the tricks that you can take, as well as instantaneous. "We need structural interventions - stresses - such as the scrapping of old boilers and cars up to € 3, supervise the burning biomass stoves and fireplaces, and reduce the temperature of heating homes."
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