Recently had to replace a SDS011 sensor and esp board after the existing one had water ingress and stopped working. Replacement works and connects to network but reads very high (600 - 700 PM 2.5) is it likely to be a faulty sensor or is there some other fix?
Note; I have 4 other sensors co-located and all read normal levels (2- 50 PM2.5) and the newly flashed esp board works fine with one of the other sensors reading normal.