Steps to Improve Indoor Air Quality

Written by: Aaron Patterson
December 24, 2023
Steps to Improve Indoor Air Quality

Indoor air quality is a critical component of a healthy living and working environment. As we spend a significant portion of our time indoors, the air we breathe can greatly impact our well-being, productivity, and overall health. 

Here, we break down the essential steps to enhance the air quality in indoor spaces for homeowners, business owners, and facility managers. It is possible to create safer, more comfortable environments for ourselves and others by understanding the sources of indoor air pollution.  

Understanding and Assessing Indoor Air Quality

Indoor air quality (IAQ) focuses on air health and comfort in buildings. Effective IAQ management involves identifying and controlling pollutants. Assessing IAQ requires identifying sources like indoor activities, building materials, and external air. 

Key pollutants include VOCs, particulate matter, mold, carbon monoxide, and radon. IAQ evaluations involve visual inspections, and IAQ monitors to measure pollutants and environmental conditions. This assessment guides strategies to improve air quality, such as enhancing ventilation, maintaining HVAC systems, and using air purifiers.

Common Indoor Air Pollutants and Their Effects

Various pollutants affect IAQ:

  • Volatile Organic Compounds (VOCs): Emitted from products like paints and cleaners, causing respiratory issues and other health problems.

  • Particulate Matter (PM): Includes dust, pollen, and smoke, potentially aggravating heart and lung conditions.

  • Mold: Grows in moisture, releasing spores that can cause allergies and respiratory issues.

  • Carbon Monoxide (CO): A deadly gas from incomplete fuel burning, mimicking flu symptoms.

  • Radon: A natural gas from soil linked to lung cancer in non-smokers.

  • Biological Pollutants: Encompass bacteria, viruses, and animal dander trigger allergies and asthma.

  • Lead Particles: From old paint, affecting the nervous system.

  • Asbestos: In older construction materials, causing lung diseases.

  • Formaldehyde: Found in pressed wood and fabrics, irritating eyes, nose, and throat, and potentially increasing cancer risk.

Understanding these pollutants is crucial for effective IAQ management and ensuring occupant health.

Improving Ventilation for Healthier Indoor Air

Enhancing indoor air quality is crucial, and effective ventilation is key. It dilutes pollutants like VOCs, particulate matter, and biological contaminants by introducing fresh outdoor air. Following ASHRAE guidelines ensures optimal ventilation rates for health and comfort.

Key tactics include:

  • Open Windows and Doors: Simple and cost-effective, this promotes cross-ventilation, especially in favorable weather.

  • Exhaust Fans: Essential in kitchens and bathrooms, they remove pollutants at the source.

  • Upgrade HVAC: Incorporating ERVs or HRVs improves air exchange efficiency.

  • Furniture Placement: Arrange for unobstructed airflow.

  • Window Treatments: Use blinds and drapes to enhance airflow.

  • Intelligent Airflow Management: Combine selective window openings with air purifiers when outdoor air is poor.

These strategies, part of a comprehensive approach to air quality, significantly improve indoor environments.

Strategies for Effective Natural and Mechanical Ventilation

Balancing natural and mechanical ventilation optimizes air quality. Natural methods use environmental forces, while mechanical techniques rely on technology.

Natural ventilation strategies:

  • Stack Ventilation: Utilizes warm air rising to create airflow, with windows at different levels.

  • Trickle Vents: Small vents in windows maintain airflow without drafts.

  • Wind Power: Position windows and vents to use natural wind for air circulation.

Mechanical ventilation strategies:

  • Whole-House Fans: Refresh the entire home by pulling in fresh air and expelling stale air.

  • Balanced Ventilation Systems: ERVs and HRVs exchange air efficiently, conserving energy.

  • Demand-Controlled Ventilation: Adjusts airflow based on occupancy for efficiency.

  • Supply Ventilation Systems: Introduce fresh air, creating positive pressure to push out stale air.

Selecting between natural and mechanical, or a hybrid approach, depends on your space's characteristics, climate, and outdoor air quality. Tailoring your choice ensures a fresh, healthy indoor atmosphere.

Regular HVAC System Maintenance

Maintaining your HVAC system is vital for excellent indoor air quality. Regular maintenance prevents pollutants, boosts efficiency, and extends system life. Key maintenance tasks include:

  • Filter Replacement: Inspect monthly and replace quarterly or as recommended. Clean filters trap dust and pollen.

  • Duct Inspection and Cleaning: Regular cleaning by professionals removes dust and dander, improving air quality.

  • Annual Servicing: Have a technician check refrigerant levels, thermostat accuracy, and overall system health yearly.

  • Drains and Coils Maintenance: Clean condensate drains and evaporator coils to prevent mold and bacteria growth.

  • Seals and Insulation Check: Ensure airtight seals and proper insulation for consistent temperatures and reduced dust circulation.

  • Component Lubrication: Lubricate moving parts to reduce wear and prevent particulate introduction.

Consistent HVAC maintenance enhances air quality and energy efficiency.

Best Practices for HVAC Care

To maximize HVAC performance and lifespan while maintaining high indoor air quality, adopt these best practices:

  • Seasonal Check-Ups: Schedule system evaluations before extreme weather seasons to ensure readiness.

  • Thermostat Management: Use a steady, comfortable setting, and consider a smart thermostat for optimal operation.

  • Enhance Insulation and Sealing: Seal leaks around windows and doors to maintain conditioned air and reduce HVAC strain.

  • Unblock Vents and Registers: Ensure vents are free from obstructions for even air distribution.

  • Monitor for Unusual Sounds: Address odd noises promptly, as they may indicate internal issues.

  • Prompt Repairs: Address small repairs quickly to avoid larger problems and maintain air quality.

  • Observe Performance Changes: Consult a specialist if you notice efficiency or air quality declines.

  • Energy Bill Tracking: A spike in energy costs can indicate an overworked HVAC system, signaling maintenance needs.

Implementing these practices ensures your HVAC system remains efficient, prolongs its lifespan, and sustains clean indoor air.

Optimal Humidity Control

Maintaining ideal humidity (30-50%) is key for comfort and health, reducing allergens like mold and dust mites. Strategies include:

  • Humidistats: Integrate these with your HVAC to monitor and adjust humidity levels.

  • Humidifiers and Dehumidifiers: Use humidifiers in dry months and dehumidifiers when it's damp to balance moisture.

  • Advanced HVAC Systems: Opt for systems with humidity control for precise adjustments.

  • Effective Ventilation: Ensure good airflow in high-moisture areas like bathrooms and kitchens.

  • Regular HVAC Maintenance: Keep humidity control systems in top condition for efficiency.

Proper humidity control is vital for the health, comfort, and protection of your home's structure.

Dehumidifiers and Air Conditioner Utilization

Dehumidifiers and air conditioners are crucial for maintaining recommended humidity levels:

  • Dehumidifiers: Choose the right size for the area, maintain regularly, and place in high-humidity spots like basements or laundry rooms.

  • Air Conditioners: Regular servicing ensures efficient moisture control. Use smart thermostats with humidity settings and ensure proper insulation to support dehumidification.

  • Ventilation Support: Use exhaust fans in moisture-generating areas to aid your AC in maintaining a dry indoor climate.

Combining dehumidifiers and air conditioners effectively balances indoor humidity, enhancing comfort and preventing moisture-related issues.

Source Control: Eliminating Indoor Air Pollutants

Effective source control is essential for reducing indoor air pollution. Key strategies include:

  • Seal or Remove Pollutants: Identify and either remove or seal off pollution sources, like fixing leaks to prevent mold, encapsulating asbestos, or replacing VOC-emitting furnishings.

  • Optimize Appliance Emissions: Ensure combustion appliances like stoves and heaters vent properly to minimize indoor exposure to harmful gases.

  • Mindful Chemical Use: Use household chemicals in well-ventilated areas and store them away from living spaces.

  • Renovation Care: Choose low-VOC materials for renovations and ensure proper ventilation during and after the work.

  • Responsible Waste Disposal: Dispose of hazardous waste like chemicals and mold-infected items properly.

Addressing pollution at its source is a proactive way to improve indoor air quality.

Practical Measures to Reduce Indoor Pollutants

Simple actions can significantly lower indoor pollutant levels:

  • No Indoor Smoking: Ban smoking indoors to prevent harmful chemicals from contaminating the air.

  • Strategic Mat Placement: Use high-quality doormats and remove shoes to limit outdoor pollutants entering the home.

  • Ventilation During Activities: Use exhaust fans or open windows in areas like kitchens and bathrooms during pollutant-generating activities.

  • Conscientious Cooking: Use rear burners and range hoods on gas stoves to reduce combustion by-products.

  • Low-VOC Products: Choose paints, sealants, and cleaners with low VOC emissions.

  • Regular Fabric Cleaning: Vacuum carpets and furniture and wash draperies to remove absorbed pollutants.

  • Pet Care: Regularly bathe and groom pets to reduce allergens like dander.

  • Integrated Pest Management: Use pest control methods that minimize chemical use.

Implementing these measures consistently can greatly improve your indoor air quality, creating a healthier environment.

Utilizing Air Cleaners Effectively

To maximize the benefits of air cleaners, consider these tips:

  • Match Purifier to Space: Select a purifier that fits the size of your room. Too small won't be effective, and too large is costly.

  • Choose the Right Technology: Understand different purifiers. HEPA filters capture particles, activated carbon targets odors, and UV light purifiers neutralize microorganisms.

  • Strategic Placement: Position your air cleaner for optimal air intake and distribution, avoiding hidden corners.

  • Regular Maintenance: Follow the maintenance schedule, including filter replacement and cleaning, to maintain efficiency.

  • Continuous Operation: Run your air cleaner continuously for consistent air quality.

  • Combine with Other Methods: Use air cleaners as part of a broader air quality strategy, including ventilation and source control.

Integrating air cleaners thoughtfully enhances indoor air quality.

Selection and Upkeep of Air Purifiers

Choosing and maintaining an air purifier involves:

  • Identify Needs: Determine your primary need for an air purifier, like allergy relief or smoke mitigation.

  • HEPA Filters: Opt for purifiers with true HEPA filters for trapping fine particles.

  • Additional Features: Look for extra purification layers like pre-filters, activated carbon, or UV lights.

  • Energy Efficiency: Choose ENERGY STAR-certified models for lower energy consumption.

  • Noise Level: Consider the noise level for a peaceful environment.

  • Routine Maintenance: Follow the manufacturer's maintenance guidelines for optimal performance.

  • Smart Features: Advanced purifiers with air quality sensors and filter change indicators simplify upkeep.

Selecting the right air purifier and maintaining it properly ensures a healthier indoor atmosphere.

Indoor Plants: A Natural Approach with Limitations

Indoor plants, while aesthetically pleasing, have limited air-purifying capabilities. They modestly absorb toxins like VOCs but are less effective than mechanical air filters in large spaces. Overwatering can increase humidity and mold risk, and some plants may trigger allergies. While beneficial, plants are not a standalone solution for air purification and should complement other strategies like ventilation and air purifiers.

Integrating Indoor Plants for Air Quality

To effectively use indoor plants for air quality:

  • Choose Effective Plants: Opt for species known for air purification, such as spider plants, snake plants, and peace lilies.

  • Strategic Placement: Place plants in areas where you spend most of your time, like living rooms or near workspaces.

  • Maintain Balance: Ensure good ventilation in plant-filled spaces to prevent humidity and mold issues.

  • Avoid Overcrowding: Distribute plants to maintain airflow and reduce humidity.

  • Regular Maintenance: Keep plants healthy with routine care and clean leaves for optimal photosynthesis.

  • Monitor Plant Health: Address any signs of distress or disease promptly to prevent air quality issues.

Incorporating plants as part of a wider air quality strategy can enhance both aesthetics and air purification in indoor environments.

Promoting Healthier Indoor Environments

Creating a healthier indoor environment involves holistic choices:

  • Sustainable Building and Furnishing: Use eco-friendly materials in construction and decor to reduce harmful emissions.

  • Green Living Practices: Adopt environmentally friendly habits like using natural cleaning products, reducing clutter, and avoiding artificial fragrances.

  • Conscious Construction Choices: In remodeling or building, choose low-emission products and ensure airtight seals for better air quality.

  • Selection of Personal Products: Prefer personal care items with natural ingredients to limit chemical presence.

  • Smart Home Integration: Use intelligent systems for continuous monitoring and adjustment of indoor air quality.

These deliberate choices in construction, products, and technology foster a well-being-supportive environment.

Healthy Habits for Cleaner Indoor Air

Adopting certain habits can significantly improve indoor air quality:

  • Diligent Housekeeping: Regular cleaning with HEPA-filtered vacuums and microfiber cloths captures allergens effectively.

  • Vehicle Exhaust Vigilance: Enforce no-idling rules near homes to prevent outdoor pollutants from entering.

  • Conscious Crafting: Use non-toxic materials for creative projects and ensure good ventilation.

  • Smoke-Free Sanctuary: Ban indoor smoking to eliminate tobacco smoke pollutants.

  • Cooking with Care: Use exhaust fans while cooking, especially on gas stoves, to remove combustion particles.

  • Aerosol Alternatives: Reduce aerosol spray use to limit chemical dispersion.

  • Moisture Vigilance: Quickly address water leaks to prevent mold growth.

  • Proper Chemical Storage: Store chemicals in sealed containers and away from living areas to minimize VOC exposure.

Integrating these practices into daily routines reduces indoor air pollutants, enhancing the health of your living space.

Choosing Materials and Furnishings Wisely

Selecting the right materials and furnishings is key for healthy indoor air:

  • Low-Emission Products: Choose low-VOC or low-formaldehyde paints, flooring, and insulation.

  • Easy-to-Clean Surfaces: Prefer furnishings and floors that resist dust and are easy to clean.

  • Hard Surfaces: Opt for wood, laminate, or tile over carpets for fewer allergens.

  • Natural Fibers: Select natural fiber furnishings, but watch for added treatments.

  • Eco-Friendly Upholstery: Choose upholstery with reduced VOC emissions.

  • Inspect Secondhand Items: Check pre-owned furniture for mold, dust, and odors.

  • Safe Wallpaper Choices: Use wallpapers free from PVC and harmful substances.

These choices contribute to better indoor air quality and a healthier living space.

Monitoring Indoor Air Quality

Effective indoor air quality monitoring involves:

  • Air Quality Sensors: Use sensors to detect pollutants like VOCs, PM2.5, CO2, and monitor humidity and temperature. They provide real-time feedback for immediate action.

  • Smart Home Integration: Connect monitors to smart home systems for automated responses, like activating air purifiers or adjusting HVAC settings when air quality changes.

  • Professional Assessments: Regular evaluations by air quality experts can identify issues beyond the scope of home sensors.

  • Radon Testing: Include radon tests, especially in areas with known radon prevalence, due to its health risks and undetectable nature.

Selecting appropriate monitoring tools is crucial for maintaining a healthy indoor environment.

Effective Use of Air Quality Monitors

To maximize air quality monitors:

  • Strategic Placement: Install monitors in high-traffic and potential pollutant areas like kitchens and bedrooms.

  • Data Interpretation: Understand the health implications of various readings to make informed adjustments.

  • Maintenance and Calibration: Regularly service and recalibrate monitors for accurate readings.

  • Alert Responsiveness: Set up alerts for poor air quality and have a response plan, such as increasing ventilation.

  • Data Logging: Record data to track long-term trends and evaluate air quality strategies.

  • Integration with Other Systems: Use monitors alongside other tools like air purifiers and HVAC systems for comprehensive air quality management.

Proper use of air quality monitors provides valuable insights, guiding effective strategies to maintain and improve indoor air quality.


In conclusion, improving indoor air quality is a multifaceted endeavor. It involves selecting low-emission materials, utilizing effective ventilation, regular HVAC maintenance, and integrating air purifiers and plants wisely. 

Monitoring air quality and adopting healthy habits are also crucial. By embracing these strategies, you can significantly enhance the air quality in your living or working spaces, ensuring a healthier, more comfortable environment for all occupants.

Read more about the types of indoor air quality solutions for residential use from our resources at HVAC of America.

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