PM2.5 not showing?

[lhessel]

Maybe I'm not understanding how Windy works. I'm in an area where there is a ton of smoke and particulate matter in the air (for the past 18 hours and forecasted for the next few days) but none of it is showing up on Windy's PM2.5 overlay. Why would that be?

[petra.pik]

Hello @lhessel, short term forecast models feature narrow forecast time and are thus vulnerable in their sensitivity to soaring variations in air quality, defined as sudden events.
It can happen that the forecast doesn't correspond with the real-time situation.

In which area are you noticing this?