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Precise Air Systems Inc.
Indoor Air Quality

Clearing the Air: IAQ Strategies for Smog and Wildfire Season in LA

March 30, 2026 · 7 min read · By Precise Air Systems

Lennox PureAir S whole-home air purification system

Between seasonal smog and wildfire smoke events, Los Angeles homes face some of the country's toughest outdoor air. The good news: a well-equipped HVAC system can keep your indoor air dramatically cleaner than what's outside.

Layer 1 — Filtration

Upgrading from a basic fiberglass filter to a high-MERV media cabinet captures far more fine particulate — the PM2.5 that makes smoke days hazardous. Media cabinets also protect your equipment itself.

Layer 2 — Purification

Whole-home air purification systems, like the Lennox Healthy Climate line we install, treat every room through your existing ductwork rather than one corner of one room like portable units.

Layer 3 — Smart ventilation

On clean-air days, controlled ventilation dilutes indoor pollutants. On smoke days, your system should recirculate and filter instead. Proper controls make the difference automatic.

Start with an assessment

Every home is different — duct condition, filter compatibility, and system age all matter. We'll assess your setup and recommend only what your home actually needs, with transparent pricing. Explore our Indoor Air Quality services or request an estimate.

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