If the government allowed your neighbors to use your property as their sewer without paying for the privilege, that would definitely be a subsidy for them. We m

If the government allowed your neighbors to use your property as their sewer without paying for the privilege, that would definitely be a subsidy for them. We make people clean up their sewage before dumping it. Breathing isn’t an issue only because it’s a negligible quantity. If it was more significant, we’d have to have rules around it just like we do for other human waste.