Are people at Pollution Control Department drunk when they fill in the index color in the maps at http://air4thai.pcd.go.th/.  I noticed this Many times now and also noticed they in general have significantly lower values than https://aqicn.org/map/thailand which is more in sync with my own measurements. From 13^th of February it is not allowed to burn anything and I noticed since then that from around noon until late it is fairly good air quality. But not in the morning when it is just as bad as before.

1. Are both websites run by the government's Pollution Control Department?

 

2. Are you comparing values measured at the same station, at exactly the same time?

I posted in the CM forum about a month ago that the real time PM 2.5 numbers on bus stop lighted signs were about 1/3 of the numbers my SNDWAY was simultaneously showing.

Look at the non-stop 1 star ratings /comments of that app at Play Store.

5 hours ago, JimmyJ said:

I posted in the CM forum about a month ago that the real time PM 2.5 numbers on bus stop lighted signs were about 1/3 of the numbers my SNDWAY was simultaneously showing.

What is your SNDWAY?

5 hours ago, JimmyJ said:

Look at the non-stop 1 star ratings /comments of that app at Play Store.

What app do you mean with "that app"?

1 hour ago, Puccini said:

What is your SNDWAY?

SW-825

1 hour ago, Puccini said:

What app do you mean with "that app"?

The app under discussion - 

air4thai.

https://forum.thaivisa.com/topic/1143946-cm-bus-route-signs-show-pm-25-aqi-info-how-accurate/

5 hours ago, JimmyJ said:

SW-825

What is SW-825?

7 hours ago, Puccini said:

What is SW-825?

Thank you.

 

Therefore, either your device or the one on top of the bus stop sign or both show wrong PM2.5 values. Is that it?