"DENEB" in METAR
The code DENEB means fog dispersal operations in force.
The only such system I ever heard of was the WW2 RAF "FIDO" which involved burning petrol from a sprayer-equipped pipeline running down the side of the runway - not a good plan in a bomber shot full of holes & leaking fuel...
Where, if anywhere, is this done nowadays?
How is/was it done?