Controlled Burn Smoke Indicator

One has to wonder how many millions of dollars are wasted each year by fire departments being called out to a home where someone is burning brush or other debris.

Honest people driving down the road see a massive plume of smoke rising from a home or building and in good consince, call the fire department as perhaps someones house is burning down.

This idea is for an additive that can be thrown into the fire as it is burning that would emit a distinct colored smoke(ie Green for example). This would indicate to observers that the fire is being monitored by someone and is not an uncontrolled fire. Like wise the Fire Department could have Red smoke material which would let people know that the FD is on the scene so they don't continue to inundate emergency services with repeated calls.