On 7 September 2020, for the first time ever, the world will join together to mark the UN’s International Day of Clean Air for blue skies. The theme for 2020 is “Clean Air for All”. Air pollution is now the greatest environmental threat to health, but it is preventable. We have the solutions and technology. To improve our air quality we need everyone on board –from individuals to private companies to governments. Air pollution doesn’t have to be a part of our collective future. Cleaner air will make us healthier, protect nature and help achieve global climate change goals.