By Robin McKie Observer science editor

Ministers’ latest proposals, published on Friday after high court intervention, criticised by climate groups calling for stronger action on illegal pollution levels

Environment lawyers are expected to take the government back to court over its controversial plans to tackle the UK’s air pollution crisis. They say the proposals are so weak they flout ministers’ obligation to protect public health.

The government published its plans to cut levels of diesel fumes, nitrogen oxides and particulates in the atmosphere on Friday – after being forced by judges to act on the crisis. Medical experts say toxic air is responsible for tens of thousands of premature deaths every year.