Can bonfires be controlled/prohibited? Are they non polluting?

Air pollution kills

Rizal Philippines |  April 19, 2013

There too many bonfires smoldering at the mountain/hillsides;  they may be good for the mangoes but do they contribute to better air quality?  Can they go our of control and cause forest fires?  These mountains are very much part now of Metro Manila.

This area was recently burned;  as I was standing there, another area of the subdivision was burning