
The categories of plastic indicated by the numbers are:

1 Polyethylene Terephthalate  (liter sized soda bottles)
2 High-Density Polyethylene   (milk jugs, shampoo bottles,condiment bottles)
3 Vinyl
4 Low-Density Polyethylene
5 Polypropylene
6 Polystyrene
7 Other

The city collects plastics of type 1 and 2.
