Thursday 20 June was the UK’s Clean Air Day 2019. Organised by charity Global Action Plan, Clean Air Day is the UK’s largest air pollution campaign. It’s been conceived to urge people in Britain to think about how they might reduce their emissions and help improve air quality. According to the World Health Organisation (WHO), road transport accounts for up to 30 per cent of particulate emissions in Europe. Much of that comes from the exhaust pipes of internal combustion engine vehicles. Here we reveal how car drivers can reduce their emissions and make every day a Clean Air Day.