Typical air vs. spike days
- Annual average PM2.5 (8.00 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (33.61 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 Menomonee Falls without contradicting EPA-aligned thresholds.
Seasonal Pollen and Mold Load
In Menomonee Falls, the seasonal load on HVAC filters is driven largely by local vegetation and humidity. The Menomonee River corridor and surrounding parklands produce significant tree and grass pollen throughout the spring and summer. These larger biological particles, combined with mold spores that thrive in Wisconsin's humid summers, can quickly saturate a low-efficiency filter. When a filter becomes overloaded with organic material, it not only restricts airflow but can also become a breeding ground for odors, making regular filter changes a technical necessity rather than a suggestion.
Technician's Filter Recommendations
Given the peak PM2.5 levels exceeding 33 µg/m³, I recommend a MERV 13 pleated filter for local residences. Standard MERV 8 filters are designed to protect the HVAC equipment from large dust bunnies, but they are ineffective against the fine particles measured in PM2.5 data. Since ozone peaks also reach 0.0815 ppm, a filter with activated carbon is highly recommended to help adsorb gaseous pollutants.
- Primary Filter: MERV 13 for fine particulate capture.
- Gas/Odor Control: Activated carbon media.
- Maintenance: Replace every 60 to 90 days to prevent pressure drop.