Take on the air quality index

I'm about a week from departing for Asia and decided to check the air
quality index on my handy IPhone app. I can't say I am surprised, but
there is something slightly disconcerting about seeing a 347 rating
with a big 'hazardous" sign next to it. I think I have been there
when it's been in the 400's and you could literally taste the
pollution as it would get stuck to your teeth while walking down the
street
Can't wait to run 6 miles next week!!