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 Temple City without contradicting EPA-aligned thresholds.
San Gabriel Valley Pollen Loads
Being in the San Gabriel Valley, Temple City is subject to heavy seasonal pollen counts from local landscaping and regional flora. Trees like ash, elm, and pine contribute to a high particulate load during the spring months. These allergens act as a 'pre-filter' on your HVAC system, often clogging the media before the fine dust and PM2.5 are even captured. This biological debris can also hold moisture, potentially leading to odor issues within the ductwork if filters are not changed regularly. Monitoring the physical condition of your filter during the spring and fall is vital for maintaining airflow.
Professional Filter Advice
To combat the 35.98 µg/m³ PM2.5 peaks, I recommend a MERV 13 pleated filter. This grade of filtration is specifically designed to capture the microscopic particles that MERV 8 filters miss. Given the high ozone peak of 0.0917 ppm, a dual-action filter with activated carbon is highly recommended. Carbon is the only material that can chemically adsorb ozone and other gaseous pollutants, preventing them from entering your home. In this region, filters should be replaced every 60 days. If you notice increased dust on your furniture or if someone in the home has allergies, move to a 45-day replacement cycle. Keeping a fresh filter ensures that the HVAC system doesn't struggle against the high particulate load common in the San Gabriel Valley.