Inaccurate
This App does not have good data and is inaccurate. I live in DC and downloaded this App a week ago. In that time, this App has told me that DCs particulate pollution is at the very highest levels at times (above 300 or above 600, for example). Other times, it tells me DCs pollution is zero particles. The bottom line is that its not a reliable App and has inaccurate data underlying its results.
Wash DC20009 about
Plume Labs: Air Quality App