← Back to Blog
New SystemsMarch 10, 2026

Lexington's Spring Pollen Season and the Case for Air Duct Cleaning

By Jennifer Walsh

Lexington, Massachusetts, is justifiably proud of its historic landscape. The town common near Battle Green, the mature oaks and maples lining Massachusetts Avenue, and the expansive open spaces around Munroe Center for the Arts and the Great Meadows create a verdant, living community that feels connected to the natural world. But every spring, that same natural abundance unleashes a pollen assault that affects thousands of Lexington residents. Tree pollen from birch, oak, and maple begins in March and gives way to grass pollen through May and June, creating months of elevated allergen exposure for anyone who spends time in Lexington, indoors or out.

The critical and often overlooked fact is that the interior of your home is not a refuge from pollen during spring season — not unless your air ducts are clean. Throughout the winter, your HVAC system has been circulating the same air repeatedly through ductwork that has been collecting pollen from last spring and fall, along with dust, pet dander, and mold spores that accumulated during the months your home was sealed against the cold. When spring arrives and you open your windows for the first time, or when outdoor pollen enters through your HVAC system's fresh air intake, these new particles combine with the existing reservoir inside your ducts. The result is a concentrated indoor allergen environment that can make symptoms significantly worse than outdoor exposure alone.

Lexington's older homes near the Lexington Center and the historic districts around Hancock Street and Clarke Street are particularly susceptible because their ductwork is older and more prone to gaps and leaks that allow additional contaminants to enter from wall cavities and attic spaces. Our VENTNEX technicians have found that homes in the Turning Mill neighborhood and along Waltham Street consistently show some of the highest pollen accumulation levels we encounter on the North Shore, likely due to the density of mature deciduous trees in those neighborhoods.

A professional duct cleaning in early spring clears the accumulated allergen burden from your duct system before the peak pollen season arrives, giving your HVAC filter the best chance of managing incoming spring pollen effectively. We recommend scheduling your Lexington duct cleaning in March, which aligns perfectly with the timing of your annual spring HVAC inspection. Our team serves all of Lexington and surrounding communities, and we offer free estimates along with camera inspection documentation so you can see the difference the cleaning makes. Call VENTNEX today and take control of your indoor air quality before allergy season peaks.