Typical air vs. spike days
- Annual average PM2.5 (8.10 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (32.50 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 Kenner without contradicting EPA-aligned thresholds.
Humidity and Seasonal Load
Proximity to Lake Pontchartrain and the surrounding wetlands creates a high-humidity environment that directly impacts indoor air quality. This moisture supports significant mold spore activity and keeps local pollen, particularly from oak and river birch, heavy in the air. These biological particles create a constant physical load on your HVAC system. In the city, the combination of high humidity and seasonal pollen means filters often become saturated with organic material faster than in drier climates. This saturation can lead to restricted airflow and reduced system efficiency if the filtration media is not monitored closely during the peak spring and fall seasons.
HVAC Filter Recommendations
Because the worst-day PM2.5 levels exceed 25 µg/m³, I recommend using a MERV 13 pleated filter for most residential systems. A MERV 13 is dense enough to capture the fine particulates seen during local spikes without excessively restricting airflow, provided the system is modern. If your HVAC unit is older or has a smaller cabinet, a MERV 11 is the absolute minimum baseline. Due to the high humidity and the resulting potential for mold and dust clumping, filters in the area should be inspected every 30 days and replaced at least every 60 to 90 days. For residents particularly sensitive to the 0.0663 ppm ozone peaks, look for filters that include a layer of activated carbon. This helps neutralize gaseous pollutants that standard fiberglass or polyester filters will simply miss. Always ensure a tight seal around the filter frame to prevent air bypass.