Some on here do like to make it sound like London is a polluted slum with poisonous air like Lahore, Pakistan (officially the most polluted city in the world.....depending on which table you read!!).
London levels are already well within WHO guidelines and they are getting better all the time dues to better cars....but also other reason (industry, domestic use etc). As said above they are some quite small places in the UK with far worse pollution. The geographical position of the UK....in the sea of the West coast of Europe...... means that most of the time the prevailing wind keeps the UK cleaner than it might be if it was elsewhere too. ULEZ does not affect me (but these things have a habit of spreading)......and it will only be a matter of time before E4 petrol cars won't cut it anymore and those of you with E5 cars will be forced to make changes. Seems like a massive hammer to crack a pretty small nut. Does anyone know anyone who has died or even has serious health problems as a direct result of London air.....I doubt it very much.....and if you say yes them proving it is just about impossible.