It?s an inconvenient truth folks. Human activity is responsible for most air pollution. Our right to drive what we like, when we like, how we like and where we like, and no politicians being serious enough to challenge this, is much of the problem. We can witter on but need a fundamental change in society. But great to do our bit. Happy to debate around a pint sometime. Diesel vs petrol is just a side show. Less (miles) is more.