Domes give kids chance to exercise in clean air

With Beijing education authorities urging schools to cancel outdoor activities when pollution level alerts hit orange, some international schools in the capital are building facilities to ensure children can exercise in cleaner air.

The color-coded alert system, in order of increasing severity, is blue, yellow, orange and red.

In order to ensure children do not have to cut down their outdoor activities due to air quality, international schools in Beijing are spending tens of millions of yuan building air domes - large enclosed areas with filtered air.