Air pollution models: Automatically set root vars
Whitespace
Air Pollution: rm model default setup from UI code

Helps with [#66948674]
Air Pollution: rename confusing variable names
rename carElectricRate -> electricCarPercentage
Air Pollution: now we can simplify variant setup

Helps with [#66948674]
Air Pollution: increase pollution rates in #2, #4

[#66948674]