Plastics by the number

Here's an article on the plastics debate. At the end there's a simple way to remember which plastics to avoid because of possible toxins:

the symposium handed out a reminder card listing “safer plastics” as those marked (usually at the bottom of a container) 1, 2, 4 or 5. It suggests that the “plastics to avoid” are those numbered 3, 6 and 7 (unless they are also marked “BPA-free”).