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Because I seem to get some sort of terrible cough every time I'm in Pattaya, I once did a web search to figure out the supposed air quality. Anyway, I found a website that had air quality ratings for cities all over the world. Pattaya didn't exactly rank in the acceptable range. Phuket air quality, on the other hand, was just fine. I'll be back in a month or so and I'm probably going to give Pattaya another chance. But I really can't live somewhere where I spend every day coughing.

Jacko the ones we use have an "8 hour" rating on them of either continuous or intermittent use, but it's the general concensus that it all depends upon the conditions you are using them in, for anti pollution measures I'd think that double the lifespan is probably applicable. Not wanting to teach anyone to suck eggs, but make sure you have a good seal around your boat race when wearing them or you defeat the object.