1. Red trash cans: represent hazardous substances;
2. Blue trash cans: represent recyclable substances;
3. Green trash cans: represent food waste.
4, gray trash cans: in addition to hazardous substances and recyclable substances other than the garbage, masonry, ceramics, slag and other difficult to recycle waste, which is usually incinerated, buried and other treatment.
5, yellow trash cans: on behalf of the special medical waste.