Typical air vs. spike days
- Annual average PM2.5 (12.34 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (35.98 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 Encino without contradicting EPA-aligned thresholds.
Seasonal Pollen and Mold Trends
Pollen and mold counts fluctuate with the seasons, often influenced by the vegetation around the Sepulveda Basin. These biological loads add a layer of sticky debris to your HVAC system. When humidity rises, mold spores can become a concern within the ductwork if the filtration is inadequate or the filter is left in too long. This seasonal load acts as a constant tax on your system's airflow and indoor air purity.
Technician's Filter Recommendations
I advise residents to use a MERV 13 filter to handle the PM2.5 peaks that exceed 35 µg/m³. Standard MERV 8 filters will not stop the fine particles measured in these spikes. Given the high ozone readings of 0.0917 ppm, a filter with an integrated carbon media is highly beneficial for reducing chemical odors and gaseous pollutants. Change these filters every 60 days during the peak summer and winter months. If you have pets or high foot traffic, check the filter monthly; a clogged MERV 13 filter will restrict airflow and eventually damage your compressor or heat exchanger by forcing the motor to work harder against the resistance.