Air quality PM2.5 data

[sarahhhh]

Hi, I understand that PM2.5 forecasts on Windy are pulled from CAMS global atmospheric forecasts and that the horizontal resolution of this global dataset is 40km.

When I'm clicking around at locations that are less than 40km apart, the concentrations are different between these locations. Is this due to some form of processing such as interpolation that Windy does before visualising the data? If so, what kind of interpolation is it and how is it being done?

Separately I have downloaded the PM2.5 forecasts directly from the CAMS ADS and compared them with what is being shown on Windy and the concentrations can sometimes vary by a couple of ug/m3. Just want to understand the reasons behind this discrepancy.

Thanks in advance for the help!