When you think about air pollution, images of smoggy cityscapes or exhaust-filled highways might come to mind. However, the air inside our homes can also harbor a host of pollutants that affect our health and well-being. In fact, indoor air can be two to five times more polluted than outdoor air.

The good news? You can improve your home’s indoor air quality (IAQ) with a few simple changes. Let’s explore some hidden sources of pollution and how you can tackle them effectively.

1. Household cleaning products

Many household cleaning products contain volatile organic compounds (VOCs). These chemicals irritate the respiratory system and, with prolonged exposure, can cause headaches, dizziness, nausea and other health problems. Products like bleach, air fresheners and multipurpose cleaners release harmful gases that contaminate the air after use.

Solution: Switch to natural or non-toxic cleaners and look for products labeled as “low-VOC” or “VOC-free.” Keep cleaning areas well-ventilated by opening windows or using fans. As for air fresheners, the American Lung Association recommends avoiding them altogether.

2. Candles

Some scented candles, particularly those made from paraffin wax, release pollutants such as benzene and toluene — known carcinogens. When burned, these chemicals can exacerbate respiratory issues like asthma.

Solution: Opt for candles made with beeswax or soy wax, which burn cleaner and produce fewer toxic byproducts.

3. Personal care products

Items like hairspray, perfumes and deodorants often contain chemicals that contribute to poor IAQ. Aerosols are especially harmful, as they disperse tiny particles into the air that linger and can be easily inhaled, potentially damaging lung tissue.

Solution: Look for personal care products free from chemicals such as parabens and phthalates. Pick pump sprays over aerosols and opt for fragrance-free or naturally scented alternatives when possible.

4. Furniture and carpeting

New furniture, carpets and rugs can emit formaldehyde and other chemicals used in manufacturing processes — a phenomenon known as off-gassing. This airborne release can continue for months after purchase, contributing to indoor air pollution and potential health risks. Prolonged exposure can lead to headaches, respiratory illnesses, hormone disruption and more.

Solution: Whenever possible, choose furniture and carpets made from natural, untreated materials or certified by programs such as GREENGUARD. For example, select solid wood instead of composite furniture and source fabrics without chemical stain repellents. For new items, allow them to off-gas in a well-ventilated space before bringing them inside. Regular vacuuming and cleaning can help reduce dust and allergens trapped in carpets and upholstery.

5. Radon

Radon is an invisible, odorless and tasteless gas that can seep into homes through foundation cracks. It emerges from bedrock material and passes through soil. Outside, it dilutes in the air, but higher concentrations become dangerous indoors. Long-term radon exposure is the second leading cause of lung cancer in the U.S.

Solution: Testing for radon is essential, especially if you live in an area known for high levels. Radon testing kits are inexpensive and widely available. If radon is detected, professional mitigation systems can be installed to decrease exposure.

6. HVAC systems and air ducts

Over time, dust, mold and bacteria can accumulate in HVAC systems and air ducts. When the system runs, these pollutants can circulate throughout the house, worsening IAQ and aggravating allergy and asthma symptoms.

Solution: Regularly change your HVAC filters according to the manufacturer’s guidelines and have your air ducts professionally cleaned. Upgrading to high-efficiency filters or installing a whole-house air purifier can help trap smaller particles like pollen and pet dander.

7. Humidifiers

While humidifiers can provide relief from dry indoor air, they can also become breeding grounds for mold and bacteria if not properly maintained. Contaminated mist can be released into the air, triggering flu-like symptoms or even lung illnesses.

Solution: Clean your humidifier regularly and use distilled water to reduce mineral buildup. Ensure that humidity levels are kept between 30% and 50% to prevent excess moisture, which can lead to mold growth.

Indoor air pollution may be invisible, but its effects on our health are real. Addressing these hidden sources helps you create a cleaner, healthier living environment.