Your pictures: Beijing's skies

With weeks to go before the Olympics, readers sent their pictures of the skies in Beijing. On 11 July this was the view from one reader's apartment window in Zhong Guan Cun. Photo: Richard O'Connell

By 9am on the morning of Friday 11 July the haze had not lifted in northern Beijing, not far from the Olympic stadium. Photo: Dorothy Furberg

The same view but a very different picture on Saturday 12 July which dawned over Beijing with clear blue skies. Photo: Dorothy Furberg

In another part of the city, one reader is keeping a daily photographic record of the air quality starting with this on Friday 11 July. Photo: Spencer Jemelka

Saturday 12 July was clear all over Beijing as Spencer Jemelka continued his project to record the skies every day until the opening ceremony. Photo: Spencer Jemelka

Many readers have observed that weekends in Beijing tend to be clear days with blue skies. This photograph taken on Sunday 14 July was no exception. Photo: Spencer Jemelka

By Monday 14 July as Beijing citizens began another working week it was hazy skies once again. Photo: Spencer Jemelka

The scene was little different from the ground on Chungfu Road in the Haidan district of northwest Beijing. Photo: Lauren Friedman