Is drug prohibition ever beneficial, or is it solely for roleplay (in other words, for making things harder for yourself unneccessarily
)?
Do those property reduction buildings also have AIWeight? If so, they can cancel out the extra factories, right? And we can have pollution in the mod again? Anyway, the first tier pollution autobuilds are so minor, they're not killing anyone's cities. If you have to leave the Blackened Skies and whatever at 2000+, that may be fine (I can't say for sure because none of this has been tested has it?).
There are also units for combating pollution. There are also normal buildings eg carbon sink or something like that. Do they have AIWeight?
Ordinances that ban things aren't buildable, and just replace couple of building reducing some gold and removing few unhealthiness - in grand scheme of things, their effect is barely marginal.
Ordinances, that reduce properties have AIweight, so AI builds them.
I had to fix them thrice: First I made them actually reduce properties by adding effect buildings, second they can be built by everyone as National Wonder and third I removed dumb tag, that simply disabled wonders and did nothing on nonwonders.
Their effects are:
Carpool (-25 Air Pollution, Motorized Transportation - Industrial)
Commuter Shuttle Service (-25 Air Pollution, Motorized Transportation - Industrial)
Automobile Emission Reduction Act (-50 Air Pollution, Ecology - Atomic)
Clean Air Act (-100 Air Pollution, Ecology - Atomic)
Clean Water Act (-100 Water Pollution, Ecology - Atomic)
Tire Recycling Program (-25 Air Pollution, Recycling - Atomic)
National Smoking Prohibition (-15 Air Pollution, Urban Culture - Information), replaces Smoking Prohibition.
Smoking Prohibition (-15 Air Pollution, Urban Culture - Information)
Other than that there are two fire and crime reducing ordinances - they all are purely beneficial except gold cost.
As for normal buildings, that reduce pollution it depends if they met other criteria.