I've had the unpleasant experience of what I concluded to be toxic-air poisoning twice in over 30 years of air travel, on many types/countries/airlines. The two types were the146 and 757. Both times I remember smelling a slightly eggy/sulphury odour in the cabin. Both flights were 2hrs or less. The next day I had a debilitating headache, body weakness and a generally hung-over sensation. No alcohol or other things were consumed. It lessened over several days. I remember chatting with an aero-engineer who opined that there was a bit of history (allegedly).