Typical air vs. spike days
- Annual average PM2.5 (8.01 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (34.53 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 Bettendorf without contradicting EPA-aligned thresholds.
Regional Pollen and Mold Load
Beyond regulated pollutants, the area faces a heavy seasonal burden from agricultural and river-valley allergens. Being near the Mississippi River means higher humidity levels, which directly correlates to increased mold spore counts. Spring tree pollen and fall ragweed provide a hidden load that can bypass low-grade filters and settle in your evaporator coils. This buildup doesn't just ruin air quality; it forces your system to work harder, increasing your utility bills and shortening the lifespan of your equipment.
HVAC Filter Recommendations
Because the PM2.5 max exceeds 25 µg/m³, I recommend a MERV 13 filter for local homes. This grade is efficient enough to capture the fine particulates that spike during the worst air days. If your HVAC system is older and struggles with the static pressure of a MERV 13, drop back to a MERV 11 but supplement it with a standalone HEPA air purifier in the main living area. Given the local humidity and pollen cycles, filters should be swapped every 60 to 90 days. Never let a filter go a full six months; the dust and mold load from the river valley will turn a clean filter into a restrictive wall, damaging your furnace or AC compressor.