You can see the active sensors in a specific pixel by searching the address where you are planning to deploy your sensor in the PlanetWatch Map.
You then need to click on your pixel. A new frame will pop up displaying air quality historical data.
Near the bottom of the pop up, you will see how many Type 1 and Type 2 sensors are active in the pixel. If there are zero Type 1 or less than five Type 2 ones, your sensor has a chance to achieve Lead status.