It’s really depends on the measurement which I cannot verify. Many factors can affect the sensor e.g. location and pollution within that area. For aqicn.org they use the source from the government which is http://air4thai.pcd.go.th/ I found Berkeley data go up and down similar to this source. Make sure you look for PM2.5(ug/m3) value not AQI. I have never seen PM2.5 goes up to 200 though but AQI does.