PurpleAir's $250 Air Pollution Monitor Gives Government Equipment Run for Money

If you're thinking about a personal air pollution sensor, we recommend the $250 PA-II by PurpleAir as the best outdoor air pollution monitor for personal use.

Let's Clear the Air

There aren't enough air quality sensors in the United States, so it's hard to track air pollution. Please help collect this data to keep your family and neighbors healthy.

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Many weather stations are compatible with Weather Underground. Check our buying guide to find which station is right for you.

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