Typical air vs. spike days
- Annual average PM2.5 (9.12 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (41.63 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 Brandon without contradicting EPA-aligned thresholds.
Seasonal Load and Local Factors
Seasonal pollen in central Mississippi is a significant driver of indoor air issues. Oak and pine pollen are common, but the local humidity also keeps mold spore counts elevated. The proximity to the Ross Barnett Reservoir can influence local moisture levels, which directly impacts how much dust and organic matter your HVAC filter has to trap to maintain clean indoor air.
HVAC Filter Recommendations
Given that PM2.5 peaks exceed 25 µg/m³, I recommend a MERV 13 pleated filter for Brandon homes. This rating is efficient enough to catch the fine particulates that spike during the worst days of the year. Because ozone peaks near 0.070 ppm, a filter with an activated carbon layer is a smart upgrade to help neutralize odors and gases. Replace these filters every 90 days, or every 60 days if you have pets or high foot traffic. A MERV 13 provides the necessary protection during those high-spike days without overly restricting airflow in most modern systems.