“Fine particles look to average in the mid to upper Moderate range due to Canadian wildfire smoke with the potential for some hourly concentrations reaching Unhealthy for Sensitive Groups on a short-term basis,” reads the Tuesday forecast from MassDEP.

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

Large wildfires in remote regions of Canada sent smoke billowing across the border, inundating northern New England with degraded air quality at the beginning of the week.