In mid-July, as wildfires ravaged parts of Canada, the Massachusetts Department of Public Health issued a wildfire smoke alert, informing residents of the impact wildfire smoke was having on communities in Massachusetts. “This creates hazy conditions and raises fine-particle pollution levels in some areas,” the release stated. In Belmont, there is just one air-quality sensor that compiles data for the town. That’s why a group of Girl Scouts, with the guidance of longtime Belmont resident Dr. Carl Dahlberg, is working…