Yes, there is, but it seems to be glitchy.
Here is the answer from purpleair:
We are waiting for Weather Underground (WU) to let us know how to manage the sensor in their system. If you chose to upload data to WU, it will be sending it to them through their new API that is not part of the PWS system but they are working on having the two integrated together. You can look for air quality related data in their pages - if you are looking at a locations "Full Forecast" scroll down to the Air Quality box/tap. Click on that and when you scroll down to just after the map of the U.S. you will see "Nearby Pollution Monitors". In this area you will see sensors that the WU is using to get that data. Any PurpleAir sensor that have chosen to upload data to the WU will be a part of those locations, if there is a sensor in the area. Sometimes based on the WU algorithm it takes more than one device for the WU to display a reading.
The WU 2.5 air quality report and the PurpleAir map, by default, display the calculated AQI. On WU's "nearest pollution monitors" is displays PM values in μg/m3. On the PurpleAir map you can view PM values in μg/m3 by selecting RAW PM2.5 in μg/m3 under the May Data Layer menu in the bottom lefthand corner.