Some good tips for the recycling conscious. This one I've been bad about, since every town's different, and I have to locate rules (which change) myself:
After China banned used plastics this year, many municipalities in the United States no longer accept plastics numbered 3 to 7, which can include things like yogurt cups, butter tubs and vegetable oil bottles. Look at the bottom of a container for a number inside a triangle to see what type it is.