Crossword puzzle clue "something to level with"

Low-level pollution or high-level protection

Warning sign at a train station's food court? (NOTE: The original sign, without my additions, actually exists. It's in Grand Central Terminal in NYC, on the lower level — the food court level. The sig

Class, level or class level

Management level or theater level

One way to keep something level?

Something to level with

Amount required to restore something's level

Something to level with