What we compare
Every hour we compare two numbers…
The difference colours
The difference (±X µg/m³) shows how far off the model was:
Green: within 1 µg/m³ — nearly perfect.
Amber: the model overestimated…
Red: the model underestimated…
Classes and the ✓ mark
PM2.5 levels fall into classes…
The numbers on top
Decision accuracy is the share of hours…