| Topic: | Re:Re:Re:Re:Re:Re:Re:Re:Air pollution in Putney | |
| Posted by: | Thomas Barry | |
| Date/Time: | 13/01/14 10:33:00 |
| I have difficulty believing the 80% figure, I'd point out at the start - if that was true there'd be more than just one outside London high street with this problem. I'd like to see a breakdown of the bus fleet used in Putney in 2011, too, although my suspicion is it wouldn't be that different. Buses are subject to much more stringent controls than cars - this month the Euro VI regulations come into force for all new vehicles*, which means everyone's had to redesign their engines to meet standards that are effectively about as clean as you can get. Dates and NOx limits for the various Euro standards: Euro II - 7g/kWh - October 1996 Euro III - 5g/kWh - October 2000 Euro IV - 3.5g/kWh - October 2005 Euro V - 2.0g/kWh - October 2008 Euro VI - 0.4g/kWh - December 2013 Based on that I'd say most Putney buses from 2002 and 2005 will be Euro III standard, which is also the standard at which exhaust retrofitting is aimed and as Tim says it would be interesting to track just which buses were retrofitted to see which routes they run on... "Do you know if TfL are modifying their bus operator contracts to require operators to only use low emission vehicles?" Until 2011 there was an understanding that TfL would require all new vehicles to be hybrids from 1/1/2012, but this was quietly dropped with no explanation. The Euro standards override anything TfL do anyway, since it's not possible register vehicles that don't comply with the standards. TfL itself is having to redesign their 'New Routemaster' since, being a 2010 design, it's Euro V, and there's no Euro VI version of its engine. * for a given definition of 'new' - chassis registered last year are still being delivered. |