The pollution levels are a constant nuisance in cities where there is lot of industry and vehicles and other man made reasons.We all know that and the situation on the onset of winter becomes grave because of lethargy in air circulation and the pollutants finding optimum temperature conditions to hang on.
Nature provides recyclable solutions for humans and animals to live comfortable with plants and vegetation because what humans require is given by plants and what plants require is given by animals. Thus Co2-O2 cycle via photosynthesis has allowed humans to live comfortable through such natural cycles.
But now you require additional "devices" who survive on pollutants and return us Oxygen. There is a great need to focus our attention to solve the problem of pollution by introducing a new "unnatural" cycle which will supplement the natural cycle.
Any ideas on that?