Typical air vs. spike days
- Annual average PM2.5 (8.04 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (31.71 µg/m³) is what filtration must handle during bad-air events.
Sections below reference one or both metrics on purpose — that is how HVAC vs. portable guidance differs for Sewell without contradicting EPA-aligned thresholds.
Local Allergen Loads
Seasonal air loads in this part of Gloucester County are driven by heavy agricultural and wooded pollen cycles. Areas near Washington Lake Park see high concentrations of oak, maple, and ragweed pollen throughout the year. These larger particles settle quickly on surfaces but are easily kicked back into the air by foot traffic and pulled into your return vents. This creates a heavy physical load on your HVAC filter, which can lead to reduced system efficiency if the filter media becomes saturated with biological debris.
Technician's Filter Recommendations
For Sewell homes, I suggest a MERV 13 filter as the standard. The 31.71 µg/m³ PM2.5 peak is high enough that lower-rated filters, like a MERV 8, will allow too many fine particles to circulate back into your living spaces. Since ozone also reaches 0.0733 ppm, a filter with an integrated carbon layer is a highly effective upgrade to absorb gaseous pollutants and common household odors. Change these filters every 60 to 90 days. During the heavy pollen months of spring and fall, stick to a 60-day schedule to prevent the filter from becoming a restriction point that could damage your furnace or air conditioner blower motor.