How often does the EPA test the air quality?

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2/3/2018
We visited Overland Park and a very nice place. I was also told that Overland Park is also one of the most expensive cities to live in the US. In looking at the water and air quality, I'm thinking wow! What happened here? On the air quality...how often do they assess the air...every day? Doubtful. With that said, if they check it once a year or so, isn't that only a snapshot of the air quality at that specific time? To post the chances of getting respiratory diseases and such, is that really an accurate assessment? And the water...what happened here??? Really? If Overland Park is one of the most expensive places to live, why don't they have better water or is that not an accurate assessment either?
Mark | Tulsa, OK