MONADNOCK REGION, N.H. (MyKeeneNow) Thick smoke from ongoing Canadian wildfires is once again pushing air pollution levels into the unhealthy range across New Hampshire, prompting a statewide air quality alert on Tuesday.

This marks the second time this summer that wildfire smoke has significantly affected the Monadnock Region. Fine particulate matter—microscopic particles small enough to penetrate deep into the lungs—has reached concentrations deemed unsafe for sensitive populations, including children, older adults, and individuals with respiratory conditions.

As of Tuesday morning, live air monitoring data from the N.H. Department of Environmental Services showed elevated levels of pollution in Cheshire County. The air quality was categorized as unhealthy for sensitive groups, a designation that comes with public health advisories urging reduced outdoor exertion.

In addition to health concerns, residents have also reported a noticeable haze and diminished visibility. The dense layer of airborne particles, carried by wind currents from wildfires burning across central and western Canada, continues to blanket much of the Northeast and Midwest.

With 745 fires still active across Canada—many of them uncontrolled—the smoke is expected to linger above the region, though forecasters anticipate gradual improvement near the surface by midweek.

For now, those most vulnerable to air pollution are being urged to take precautions, including staying indoors during peak pollution hours and avoiding strenuous outdoor activities.