This is already a reality. > the first Cordis hotel on mainland China boasts something that is genuinely rare in big Chinese cities: clean indoor air. https:/

This is already a reality. > the first Cordis hotel on mainland China boasts something that is genuinely rare in big Chinese cities: clean indoor air. https://www.theguardian.com/cities/2018/mar/27/china-clean-air-indoor-quality-shanghai-cordis-hongqiao-filters https://www.theguardian.com/cities/2018/mar/27/china-clean-a...