Typical air vs. spike days
- Annual average PM2.5 (8.07 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (28.53 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 Delaware without contradicting EPA-aligned thresholds.
Local Environmental Loads
Beyond industrial particulates, the Olentangy River corridor contributes to high local humidity and seasonal mold cycles. Spring tree pollen and fall ragweed create a heavy physical load on air filters. These larger biological particles combine with the 8.07 µg/m³ baseline of fine particulates to saturate filter media faster than in drier climates. This makes regular filter maintenance a necessity rather than a suggestion.
Professional Filter Advice
Because the max PM2.5 exceeds 25 µg/m³, I recommend using a MERV 13 pleated filter. This higher rating is necessary to trap the fine particulates that spike during the city's worst air days. Furthermore, since ozone peaks reach 0.0776 ppm, a filter with an activated carbon layer is highly effective at neutralizing gaseous pollutants and odors that standard filters miss. Change these filters every 90 days under normal conditions, but drop to a 60-day cycle during the peak of summer or when the local pollen count is high. This prevents the filter from becoming a source of resistance that could damage your blower motor.