Students breathe easy in playground bubbles

More schools looking at fabric domes to keep smog out, but the price may be prohibitive

More schools are putting up fabric domes over their campuses to provide clean air for students - an increasingly popular trend in northern China, which is frequently engulfed by smog.

Beijing issued a red alert, the highest response level against severe air pollution, twice in December, and classes were suspended at kindergartens and at primary and middle schools.