Typical air vs. spike days
- Annual average PM2.5 (8.60 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (43.73 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 Keller without contradicting EPA-aligned thresholds.
Seasonal Load and Local Pollen
Beyond industrial or traffic-related particles, seasonal biological matter places a heavy load on local HVAC systems. In the area surrounding Bear Creek Park, oak and cedar pollen are significant contributors to indoor dust. These large particles clog the outer layers of your filter, while smaller mold spores thrive during humid Texas springs. This biological debris doesn't just affect your breathing; it settles on your AC coils, reducing efficiency and potentially leading to system failure if the filtration isn't robust enough to capture it before it enters the air handler.
Technician's Filter Recommendations
Based on the maximum PM2.5 reading of 43.73 µg/m³, I recommend a MERV 13 pleated filter for most Keller homes. Standard fiberglass or MERV 8 filters are designed to protect the equipment from large dust bunnies, but they allow the fine 43.73 µg/m³ peak particulates to pass right through. Because ozone peaks also reach 0.0886 ppm, you should consider a filter with an activated carbon layer to help neutralize gaseous irritants and odors.
- Change Frequency: Every 60 to 90 days. If you have pets or live near heavy construction, check it at the 45-day mark.
- Filter Type: MERV 13 for particulate capture.
- Add-on: A bedroom HEPA unit if anyone in the home is part of the 10.0% with asthma.