[PM25-1] [Scenario Test] Near a humidifier, two freshly assembled PM25-1 readings performed, very closely.

We found that in the vicinity of the humidifier (care needs to be taken not to get too close so that too much moisture doesn't get inside the sensor), the sensor readings were able to simulate a dust-like condition. As a simple way to assess sensor performance, this is one way to do it, probably not a great idea, but it's the simpler way we found.