This is the info on the LEDs that light up on the module I’m using
It’s exactly the same sensor
When the value is less than 150, the green D2 light turns on, the surrounding environment is relatively healthy;
When the value is greater than 200 and less than 400, the yellow D1 light turns on, the surrounding environment is moderate pollution;
When the value is greater than 400 less than 700, the red D3 light turns on, the surrounding environment is severe pollution;
When the value is greater than 800, all light turns on, the surrounding environment is serious pollution.
mick