Well, not actually a FIRE, but they're making FIRE!
Around 2pm, the temperature was 35*C and I was my way to Shi Da (School), all the people working in the buildings (business in particular) were out burning paper (ghost) )money in the big FLAME to honor their ancestors. In return, their ancestors will give them blessings and good fortune. Aside from burning money, they also offered FOOD.
Actually, today in Chinese Calendar is July 15, it's "Zhong Yuan FESTIVAL", meaning Chinese Ghost FESTIVAL. According to their history, the gates of hell are wide open and ghost arrived in a mortal world. In Taiwan, Ghost Month runs through the entire month of July, and the gate of hell are open the whole month. That's why the whole month is known to be "not a good month" with many traditional taboos still being practiced. Like don't get married, don't buy house, don't go swimming, etc. to avoid bumping into a ghost.
Imagine how hot that was + the smoke that irritated my eyes!
But, they're doing it as their belief/religion.