There are several stations that sample the air and measure particle matter I believe with lasers. They can distinguish smaller ones (up to 2.5micron) and up to 10, respectively PM2.5 and PM10. There are several other substances that can be controlled like CO2, CO, and in general other volatile components. I guess the app just gives you the quality of the nearest station or interpolates data between to stations and approximates a number for your exact location.
There are several stations that sample the air and measure particle matter I believe with lasers. They can distinguish smaller ones (up to 2.5micron) and up to 10, respectively PM2.5 and PM10. There are several other substances that can be controlled like CO2, CO, and in general other volatile components. I guess the app just gives you the quality of the nearest station or interpolates data between to stations and approximates a number for your exact location.
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