What a day! Clean Air Day 2017 trended at 1 on UK twitter for 5 hours, reaching 38million people! On 15 June, Clean Air Day caused a buzz across the UK. Thousands of people got involved in schools, businesses, hospitals and communities - making pledges, going car free and raising awareness of air pollution. With our Thunderclap alone, we reached 3.4 million people with our air quality message. [View the story "National Clean Air Day" on Storify] Thank you to everyone who helped to make Clean Air Day such a success!