From a carpool social network to incentivised car-free travel, our pick of five transport projects that tackle air pollution

1. Carpool commute – Liftshare

Every rush hour there are an estimated 38m empty seats in the cars on UK roads. The people behind car-sharing website and free app Liftshare suggest pooling vehicles to cut your carbon footprint, slash fuel bills and help reduce congestion and air pollution. A million trips are shared in its network each month, and a new journey is posted every two minutes.

Image: Willian Justen de Vasconcellos

2. From rides to strides – Living Streets

A generation ago, 70 per cent of people going to school in the UK walked – now it’s under half. The school run alone generates 2m tonnes of CO2 per year. Living Streets wants to reverse the decline. The charity provides parents and teachers with tools: from an app, to a motivational travel tracker to hang up in classrooms.