 When I hear clean air for blue skies, I think of the first time I saw the sky in Helsinki in Finland as we were arriving there with a group of friends on a boat from Stockholm and the reason why I think that is because the color of the sky was so blue that it just made you want to close your eyes and breathe like really deep breaths of air. For me it would bring the ideal of an environment where people are not relying on private cars to get around and aren't stuck in traffic jams but where people can walk on nice white clean even pavements or cycle in protected bike lanes or take clean affordable public transport from their house all the way to their place of work. Well when I hear that term I think of those places in the world that I've visited which have really clean air. One of the earliest experiences I had of that was I went on an expedition to Greenland when I was 19. It's about as far away from all the industrial pollution as you can get and I just remember the clarity and how far you could see and you know the clear blue skies that you got there.