Satellite images show forest fires that normally blanket the North in haze have dropped sharply during this year’s burning season. The images revealed 3,717 hotspots in northern national forests from January 1 to March 8 – more than four times fewer than the 17,289 hotspots in the same period of 2020, and 25,770 hotspots in 2019, said the Pollution Control Department (PCD) on Thursday.