Changchun, 31 October 2016 – This autumn, after 12 months of renovation work on 382 deluxe guestrooms and 157 serviced apartments, Shangri-La Changchun became the first hotel in the province offering guestrooms and apartments installed with an indoor PM2.5 filter, humidifier and temperature-adjustable air conditioning systems, providing comfortable guestrooms in Changchun.