It's a nice idea and fair play to the guy for volunteering his own time and equipment, but this was tried on a more permanent basis by London Fire Brigade some years ago.

For various reasons it was not practical to use a helicopter at fire incidents (main reason was the down draft created by a helicopter actually made some fires worse!) It may be of more use out in the countryside where attendance times can suffer during extreme weather incidents.

Also the type of helicopter in the picture is not suitable for carrying a lot of personnel and heavy fire fighting or rescue equipment.