Indoor air quality matters because the air inside your home is often significantly more polluted than outdoor air — and most people spend 80 to 90 percent of their time indoors. Poor indoor air quality is linked to allergy and asthma flare-ups, headaches, fatigue, respiratory irritation, and in the case of carbon monoxide or radon, serious or life-threatening health consequences. For Denver and Front Range homeowners, there are specific local factors — wildfire smoke, dry air, hard water moisture, and older home construction — that make indoor air quality a particularly relevant concern.

What’s Actually in Your Indoor Air

The pollutants commonly found in residential indoor air fall into a few categories. Biological contaminants include mold spores, dust mite debris, pet dander, pollen, and bacteria. Particulate matter — ranging from visible dust to the ultra-fine PM2.5 particles you can’t see — comes from outdoor sources (wildfire smoke, traffic), cooking, candles, and even your vacuum cleaner redistributing fine dust. Chemical pollutants include VOCs (volatile organic compounds) off-gassed from furniture, flooring, cleaning products, and paint. Combustion byproducts — carbon monoxide, nitrogen dioxide, and fine soot — come from gas appliances, fireplaces, and attached garages.

Modern, energy-efficient homes are actually more vulnerable to indoor air quality problems than older, leakier construction. Tight building envelopes that reduce heating and cooling costs also reduce natural air exchange, allowing pollutants to accumulate unless mechanical ventilation or filtration compensates.

Colorado-Specific Air Quality Concerns

Front Range homeowners face a specific combination of challenges that make indoor air quality more complicated than in many other parts of the country:

  • Wildfire smoke: Smoke events have become an annual feature of Colorado summers. PM2.5 particles from wildfire smoke penetrate building envelopes easily and are small enough to cause deep lung injury. Standard MERV 8 filters don’t capture them adequately.
  • Very low humidity: Denver’s semi-arid climate keeps indoor relative humidity extremely low in winter, often below 20%. This dries out mucous membranes, increases susceptibility to airborne pathogens, and causes static electricity and wood shrinkage. A whole-home humidifier is often as important as air filtration in Colorado homes.
  • High altitude combustion: Gas appliances at 5,280 feet burn less efficiently than at sea level. Proper venting and annual safety inspections are critical to prevent CO buildup.
  • Radon: Colorado has some of the highest residential radon levels in the country due to the geology of the Front Range. While radon testing and mitigation is a separate specialty, it’s a real indoor air quality concern for Colorado homeowners — particularly in basements.

Health Effects of Poor Indoor Air Quality

The health impacts of indoor air quality range from minor and short-term to serious and chronic. At the mild end, poor air quality causes eye, nose, and throat irritation, headaches, and fatigue. For people with allergies or asthma, it can trigger significant respiratory distress. Long-term exposure to certain indoor pollutants — including VOCs, mold, and fine particulate matter — is associated with more serious respiratory disease. Carbon monoxide exposure, even at sub-lethal levels, causes neurological impairment and cardiovascular stress.

Children, elderly people, and anyone with existing respiratory or cardiovascular conditions are most vulnerable to indoor air quality problems. If household members are experiencing unexplained symptoms that seem better when they’re away from home, indoor air quality is worth investigating as a potential cause.

What Done Can Do About It

Improving indoor air quality isn’t a single product or one-size-fits-all fix — it depends on what’s actually degrading the air in your specific home. Done’s approach starts with understanding your home’s characteristics and your household’s health concerns, then recommending targeted solutions: high-efficiency filtration, whole-home humidification, UV air purifiers, ventilation upgrades, or professional duct cleaning. Visit our indoor air quality services page to learn about the solutions we offer, or schedule a duct cleaning if your ductwork hasn’t been serviced in years and may be circulating accumulated dust and debris through your home.