Typical air vs. spike days
- Annual average PM2.5 (8.63 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (43.44 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 Wichita without contradicting EPA-aligned thresholds.
Local Allergen Loads
Beyond the measured gases and particles, the local environment adds a heavy load of organic matter to your air. Proximity to the Arkansas River and the surrounding prairie landscape means high concentrations of grass and ragweed pollen during the growing season. Mold spores also become a factor during humid stretches. These larger particles don't always show up on PM2.5 monitors, but they are the main cause of rapid filter graying and restricted airflow. If you notice your filter looks heavy or dark after only a month, it's likely capturing this seasonal biological load. This organic buildup can eventually lead to odors within the ductwork if the filter is not changed frequently.
Technician's Filter Recommendation
Because the PM2.5 max exceeds 25 µg/m³ and ozone peaks are notable, I recommend a MERV 13 pleated filter for most modern systems. A MERV 13 is dense enough to capture the fine particles seen during those 43.44 µg/m³ spikes without overly restricting airflow, provided your ductwork is sized correctly. If your system is older and struggles with a thicker filter, stick to a MERV 11 and supplement it with a standalone HEPA unit in the main living area. Given the ozone peaks of 0.0779 ppm, look for filters with an activated carbon layer to help neutralize odors and gaseous pollutants. In this region, do not wait six months to change your filter. Check it every 30 days and replace it at least every 60 to 90 days to prevent the blower motor from overworking against a clogged media. The combination of high pollen and periodic particulate spikes makes regular maintenance non-negotiable.