I've been in Merida the past 2 months - and on a number of occasions, I've noticed them spraying some sort of chemical along the street from the back of a truck. What chemical is this?
I saw the very same practice when I was in Oaxaca previously so I guess it's common practice.
I'm guessing its to control mosquitos? ...which I guess is good...but how is it ok to spray this on people as they pass by??