Typical air vs. spike days
- Annual average PM2.5 (8.13 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (20.60 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 Peachtree City without contradicting EPA-aligned thresholds.
Seasonal Load on Filters
The local landscape, including the extensive tree canopy around Lake Peachtree, contributes a massive amount of organic material to the air. Pollen and mold spores are the primary drivers of filter clogs in this area. Georgia's high humidity also means that mold spores are a constant presence. These larger biological particles fill up the surface area of a filter much faster than fine PM2.5 does. When your filter turns a brownish-yellow, you are looking at the local flora that has been pulled into your ductwork and trapped by the media.
Technician's Filter Recommendations
I recommend a MERV 11 filter for most homes in Peachtree City. It provides a solid balance between filtration and airflow. Since the PM2.5 peaks stay around 20.6 µg/m³, a MERV 11 is usually sufficient, but if anyone in the home has allergies, move up to a MERV 13. Given the ozone peak of 0.073 ppm, a filter with an activated carbon or charcoal layer is highly effective at absorbing gases that standard pleats ignore. Change your filters every 90 days at a minimum. If you use your golf cart frequently and leave the garage door to the house open, you may need to change it every 60 days due to increased outdoor dust entry into the living space.