We’re off to Thailand in March (has to be then for a variety of reasons). We’ll be spending some time in Bangkok but hoping to visit a couple of other places too. Chiang Mai was high on the list but I’ve seen that air quality is a real issue at that time of the year - can anyone advise about how bad this is? Suggestions for other interesting places to visit. We’re not really resort/beach holiday people but DH would like to snorkel and I’m happy to read a book in a nice shady spot.