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Blanket bans are impractical as there are always likely to be reasons for non-compliant vehicles to enter the zone.Overall there seems to have been very little questioning of the science used to justify this policy. We keep hearing figures of several thousand people a year dying due to air pollution but the statistical basis for these claims is very shakey being based on studies from other cities and extrapolated into London. The claim that our air quality shortens life expectancy doesn't stand up to much scrutiny as there doesn't seem to be any link between how urban the area you live in is and how long you live. There is a very strong link between your income and life expectancy so it is very likely that the ULEZ will shorten the lives of a significant number of people who are having to replace a vehicle which they rely on to scrape an already meagre income.The targeting of diesel also seems to have little basis in proper research. Most diesel cars currently on the road are Euro Standard 5 or 6 which have particulate filters which make them as clean as any other vehicle for this kind of emission. What they do pump more out of is NOx. There is no dispute that particulates are not good for people's health but the evidence that NOx causes serious problems is not there simply because it always occurs at the same time as particulate pollution so you can't really test how harmful it is. Industrial workers exposed to much higher levels of NOx have not shown an elevated level of health deterioration. If you are burning a gas hob or using a gas oven in an inadequately ventilated kitchen you will be exposed to many times more NOx than you would on our local streets.It is entirely possible, or even probable, that removing Euro standard 5 cars from our roads will deliver zero benefit in terms of air quality but as a fund raising measure it couldn't be more perfectly targeted at the 'just about managing' class.

Andy Jones ● 2211d

Because it would alienate a lot of voters. If you own and drive a car in Ealing at the moment you are already being squeezed by the local mob in the Town Hall.Very laudable to sit on a moral high horse about the evils of vehicle pollution but until economic activity no longer requires the transportation of large volumes of, or bulky, goods, then there is no alternative. Unless of course you want to go back to horse and cart and canal boats from Brentford. Electric vehicles may take over one day, but if you want your handy next day Amazon or Ocado delivery then dirty old internal combustion engines are what you have to put up with.A lot of the argument about air quality ignores the enormous input from, for example, construction work (of which there is an endless amount across London) or emissions from central heating systems. Kick the car owners again because it’s an easy target.I’m an asthmatic, and have been since childhood. I grew up in a semi-rural area and got lots of exercise and fresh air. I’ve lived in London a long time and my asthma is no worse than when I was a child. A lot of asthma is genetic. Air quality may not help, but it’s not the single factor. Using anti bacterial cleaners, which kill a lot of ‘good bacteria’ as well as bad is another major contributor, as it is in the increase in allergic conditions.Perhaps there ought to be a ban on aircraft flying over urban areas while we’re at it. Certainly jet engines aren’t emissions free, but then how would all the eco warriors get to these international conferences on climate change.London may not be the cleanest city, but cities by definition are dirty, noisy and invariably messy. It’s the by-product of human existence. I suggest you go to Delhi, Mumbai or Bangkok if you want to see somewhere with really dangerous levels of pollution.There are many areas in which public health is not looked after. Why not tax fast food outlets out of existence to combat obesity. Make cigarettes illegal for obvious reasons. Ban all artificial food additives. Make salt content in food negligible. Do the same with sugar.Of course,  none of those things are as ‘on message’ as a vehicle tax. What is lacking is any balance in the ULEZ move. Those who can afford it carry on, those who can’t are the ones who pay.

Simon Hayes ● 2211d