How similar are the following two sentences?

A Stage 1 episode is declared when ozone levels reach 0.20 parts per million.
The federal standard for ozone is 0.12 parts per million.

Give the answer on a scale from 0 - 5, where 0 is "not similar at all" and 5 is "means the same thing".

OPTIONS:
- 0
- 1
- 2
- 3
- 4
- 5
2