A drive to apply new standards to air, water purifiers

Consumers need a way to assess domestic brands' efficiency, quality

How much would you pay for cleaner air and water? At the same time, how do you know the expense is justified?

In Shanghai, Zeng Wenjing spent 7,000 yuan ($1,123) for an air purifier and 10,000 yuan for a domestic water purification system. Zeng said it was a worthwhile investment, because the two devices will help to keep his family healthy.