Its not just Iowa, its many states near me have similar laws on the books and getting more every day. Its not so much the state as the towns and cities within each state that will determine what becomes law in those areas, we still as of yet have open burning in most rural area's, many states don't and haven't for years/decades.
As for worrying about something that probably won't come, doubt it will come locally, more like on a national level would be a guess then forcing your state into compliance might be closer to how it might go, but since that's political, we don't have to worry about discussing it, but that whole radical thinking in other areas, turns out the west has many forest fires that seem to be an issue for air quality in the rest of the country and I do believe its being discussed, time will tell just what comes out of it...............if its anything like most areas, first in order to save those tree's, they need to ban burning wood..............yes that's the answer, then forest fires will be a thing of the past........crazy how some think isn't it??