I had a discussion with another board member about this the other day.  Call it mist, smog, haze, fog, pollution or whatever.  I think it has got worse over the past week or so.  That said it has not caused me any respiratory problems.   Bangkok has its problems with air quality, but it is a large city.  Pattaya a few miles away.  Could it be a local cause; exhaust fumes from vehicles.   What do others think.