Without wanting to sound too blasé, such events are more common than perhaps some may think. 757s and 146s have both had a notorious history and when both types were more widely used in the UK, one never needed flick too far through the latest MORs to find similar events, having been recently reported. Although the issue does seem to have improved a lot over the years.
Full face masks, PAN calls, paramedics, cabin crew having O2 ready etc are the routine drills for such events. What would have been more worthy of note is if the crew had not carried out the above drills with such a problem.
I myself have suffered from contaminated air on very short final once. The symptoms were a combination of a mild headache mixed with a rather 'tipsy' feeling, similar to what one could expect at closing time, after one too many!