My caller ID says COUNTRY AIR when this number comes through. They leave no message but continue to call me twice a day, once in the late morning & again in the 6-8PM range.

I had the same issue.

call late after 9pm and call twice

I get called at least 2x a day by this # when I answer nobody responds

Just called, at 5:25 PM. CID says "COUNTRY AIR", woman attempting to "conduct a 30-second survey about the air quality in my area." Clearly, has nothing to do with a "survey", and everything to do with selling something. A brief search on Bing turns up Country Air of Tacoma, who, apparently, run a hard-sell business, using these cold calls to get a dealer to show up and push some grotty "air filtration" system on you.