Every winter, the heating quality is the most concerning problem for the residents. Ms. Jiang who lives in the Riverside Garden Community has her own way to judge—she often observes the chimney of the boiler house. But she also hesitates because of this problem: from the perspective of a tenant who desires warmth, she hopes that there will be more smoke emitting from the chimney which indicates that the boiler is working and the radiators will be hot; but from the perspective of a responsible citizen, she is also a little worried - if all chimneys emit smoke every day, the environment of Dandong will be polluted!