An air quality alert is in effect for all of Massachusetts as smoke from Canadian wildfires descends into the Boston area.

Each New England state has seen more days over the last five years when fine particulate matter or ozone exceeds air quality standards that are considered “unhealthy for sensitive groups.”

Massachusetts could see hazy skies throughout the day Monday as wildfire smoke from Canada drifts into the Bay State. The smoke prompted National Weather Service forecasters to issue an Air Quality Alert blanketing the entire state, warning that the air may be unhealthy for sensitive groups.