Typical air vs. spike days
- Annual average PM2.5 (8.66 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (36.48 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 Jeffersonville without contradicting EPA-aligned thresholds.
Seasonal Load and Humidity
Local humidity levels near the Ohio River contribute to mold spore counts, especially during the transition from spring to summer. Pollen from ragweed and local trees adds a heavy seasonal load to your return air vents. This biological matter doesn't just affect your lungs; it settles on your evaporator coils, reducing efficiency and creating a breeding ground for odors. In this region, your HVAC filter acts as the primary defense against these organic intruders, which can accumulate rapidly during peak blooming seasons.
Technician's Filter Recommendation
Because the maximum PM2.5 exceeds 25 µg/m³, I recommend a MERV 13 pleated filter for most modern HVAC systems. This rating is high enough to capture the fine particles seen during those 36.48 µg/m³ peaks. Since ozone also hits 0.0757 ppm, a filter with an activated carbon layer is a smart upgrade to help neutralize odors and gaseous pollutants. Follow these maintenance rules:
- Change filters every 60 to 90 days to maintain airflow.
- Check the filter at the 45-day mark if you live near high-traffic areas.
- Ensure the filter frame fits tightly to prevent air bypass.
A clogged filter restricts airflow, which can lead to a frozen coil or a cracked heat exchanger over time.