@oreoteeth When was smog season back then? I assume summer because of heat domes and similar weather phenomena, but I suppose it could also be related to some local industrial process with some other logic to it. Was it regular and predictable? Do you remember smog season not being a thing anymore at some point?
@skyfaller July and August for the most part in the 70s and early 80s. The radio station with all the weather gadgets that used to do the local measurement was bought out somewhere around the mid 80s when I was at college. So I can't say if the air quality improved or not. It was just that people stopped checking it.