How do we fix air pollution? It's simple but it needs political will

We know diesel vehicles are the key culprit, but when it comes to both long-term solutions and emergency measures the govenment has been asleep at the wheelCutting toxic levels of city air pollution to safer levels is simple, but not easy – it requires resolve. Yet, despite the key culprit in the UK being well known – diesel vehicles – the government has been asleep at the wheel for years.
Levels of nitrogen dioxide have been illegally high across much of the UK since 2010. In