Typical air vs. spike days
- Annual average PM2.5 (8.01 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (34.18 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 Uniontown without contradicting EPA-aligned thresholds.
Seasonal Load and Filter Wear
Pollen and mold are the primary drivers of filter clogs in the area. Proximity to the Laurel Highlands means heavy spring tree pollen and significant fall leaf mold. These organic particles are large enough to physically block airflow if your filter isn't swapped regularly. High humidity during Pennsylvania summers can also lead to moisture retention in standard fiberglass filters, which can encourage microbial growth if left in the return for too long.
Technician Filter Recommendations
Because PM2.5 peaks in Uniontown exceed 25 µg/m³, I recommend a MERV 13 filter. If you have a standard 1-inch filter slot, check for any whistling or reduced airflow, as MERV 13 can be restrictive; otherwise, a high-quality MERV 11 is the minimum baseline. Given the ozone peaks of 0.0655 ppm, filters with an activated carbon layer are highly effective at neutralizing outdoor gases and odors. Change your filters every 60 to 90 days. If you live near high-traffic areas or have pets, stick to the 60-day mark to ensure your blower motor isn't working against a clogged media.