Air Quality depends a lot on wind direction

Air Visual provides a mobile application with air quality forecasts

today's forecast

Khon Kaen 127 
Udon Thani 142
Sakon Nakhon 151

With the slightest wind there's a lot of dust in the air during the dry season. I witness that very obviously on my white tiled pool, which requires twice weekly cleaning to turn grout white.

Drive along any of the local highway construction sites and you get a snout full of dust, especially if you're on a motorcycle.  

Then of course there's yard waste burning

Occasionally these things get out of control

สกลนคร Sakon Nakhon