Typical air vs. spike days
- Annual average PM2.5 (8.91 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (31.18 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 Glenview without contradicting EPA-aligned thresholds.
Local Allergen Loads
Seasonal allergens like oak, maple, and ragweed create a heavy load for HVAC systems in the area. The local landscape, including proximity to the North Branch Chicago River, can contribute to higher mold spore concentrations during damp periods. These particles are much larger than PM2.5 but are produced in massive quantities, which can quickly clog a high-efficiency filter. Regular replacement is necessary to maintain airflow while still capturing these biological irritants.
HVAC Technician Filter Advice
Since PM2.5 peaks in the area exceed 25 µg/m³, a MERV 13 filter is the professional recommendation for effective capture of fine particulates. Because ozone peaks reach 0.0822 ppm, a filter that incorporates activated carbon is highly effective at reducing chemical odors and gaseous pollutants that a standard pleated filter cannot catch. To keep your system running efficiently:
- Replace your MERV 13 filter every 2 to 3 months.
- Check the filter every 30 days if you have high indoor activity or pets.
- Ensure the filter fits tightly in the rack to prevent air bypass, which allows unfiltered air into your furnace.