Pollutant
Toxic metals and
heat released
during coal
burning
Primary or
secondary?
Physical, chemical, biological,
radiological, or thermal?
I
![Pollutant Toxic metals and heat released during coal burning Primary or secondary Physical chemical biological radiological or thermal I class=](https://us-static.z-dn.net/files/d05/d880a0983d6a55003821f3fb0d0d008c.png)