How to improve indoor air quality in your home
The fastest way to improve your home’s air is to remove pollution sources, ventilate deliberately, and control moisture, then add filtration only where it’s still needed. Homes trap pollutants from cooking, cleaning and furniture until indoor air runs two to five times more polluted than outdoor air. Start today:
- Cut sources: no unflued heaters, low-VOC cleaners, lids on when cooking.
- Ventilate smartly: extractor on during cooking, windows cracked on the quiet side.
- Hold humidity between 30 and 50%; add a HEPA purifier in bedrooms if anyone has allergies.
Key Takeaways
Improving indoor air quality reliably requires removing pollution sources first, ventilating with intent, and holding humidity between 30 and 50%. Filtration and professional commissioning act as backup, not a substitute.
| Point | Details |
|---|---|
| Cut sources first | Remove unflued heaters, swap low-VOC products, and stop indoor burning before anything else. |
| Ventilate on the quiet side | Cross-ventilate with short bursts after cooking or showering, away from busy roads. |
| Hold humidity at 30–50% | Run extractors and dehumidifiers to stop mould and dust mites before they start. |
| Monitor, don’t guess | Use CO2 and PM2.5 monitors to confirm whether your fixes are actually working. |
| Call Akita for commissioning | Akita inspects, quotes, and rebalances ventilation and filtration when DIY fixes plateau. |
Table of Contents
- Source control: practical habits and product swaps that cut indoor emissions
- Ventilate smartly: when and how to exchange indoor air without inviting outdoor pollution
- Filtration: choosing and using purifiers and HVAC filters realistically
- Control humidity and prevent mould: targets and fixes homeowners can apply
- Simple monitoring: which devices to use and how to interpret results
- Routine maintenance checklist and clear signs it’s time to hire a professional
- Why professional commissioning and maintenance still matter
- How Akita can help with inspection, installation and ongoing air quality
- Frequently asked questions
- Sources
Source control: practical habits and product swaps that cut indoor emissions
Removing a pollutant at the source beats chasing it once it’s airborne. These changes cost little or nothing and start working immediately.
- Skip indoor burning where you can. Swap candles for unscented electric alternatives and keep wood burners serviced and well drawn.
- Cook with lids on and the extractor running, not just when something’s smoking.
- Dry laundry outside or in a vented space rather than on radiators indoors, where damp clothes can add litres of moisture to the air over a week.
- Choose fragrance-free, low-VOC paints and cleaning products, and open windows for a few hours after decorating or bringing in new furniture.
- Fit and test carbon monoxide alarms near sleeping areas, get gas appliances serviced annually, and remove unflued paraffin or gas heaters entirely.
Pro Tip: Buy paint and adhesives labelled “low VOC” rather than “eco” or “natural”. Those terms aren’t regulated the same way, and some “natural” products still off-gas for weeks.
Small habit changes here do more for your air than any single gadget you could buy.
Ventilate smartly: when and how to exchange indoor air without inviting outdoor pollution
Ventilation only helps if you’re pulling in cleaner air than you’re pushing out. Short, deliberate bursts work better than leaving a window cracked all day, and where you open matters as much as when.
- Cross-ventilate with short bursts after cooking, showering or cleaning, rather than leaving a single window open constantly.
- Open windows on the quiet side of the house when you can. Ventilating straight onto a busy road can actually pull in more particulates than it clears out.
- Keep trickle vents open year-round. They’re easy to forget, but they’re the background ventilation that stops a well-sealed home from turning stale.
- Run extract fans in kitchens and bathrooms every time you cook or shower, not just when the mirror steams up.
Intermittent extract fans handle daily moisture and cooking fumes fine in most homes. Continuous extract or full heat recovery ventilation (MVHR or HRV) earns its cost in tightly sealed, well-insulated properties, where natural air leakage has dropped low enough that pollutants and moisture no longer have anywhere to escape. Energy-efficiency upgrades that seal a home tighter make this kind of managed ventilation more important, not less. If you’re seeing persistent condensation, recurring mould patches, or CO2 and PM2.5 readings that stay high long after a room clears out, that’s your signal to look at upgrading rather than just opening more windows.
Filtration: choosing and using purifiers and HVAC filters realistically
A HEPA purifier removes fine particles down to 0.3 microns at high efficiency, which covers most smoke, pollen and dust. Size it to the room: check the Clean Air Delivery Rate (CADR) against the square footage, and place the unit away from walls and furniture so air can actually circulate through it, not past it.
- For HVAC filters, look at MERV rating rather than brand marketing. Higher MERV traps finer particles but restricts airflow more, so a filter upgrade sometimes needs a system check to avoid straining the fan.
- Change filters on the schedule your system’s manufacturer sets, not on a vague “when it looks dirty” basis.
- Purifiers earn their keep during allergy season, wildfire smoke events, or in bedrooms for anyone with asthma.
Pro Tip: Run a purifier on its highest setting for the first 30 minutes in a new room, then drop to a quieter setting once the air’s actually cleared. Most people leave them on low permanently and barely notice a difference.
Filtration cleans what’s already in the air. It works best paired with source control and ventilation, not as a replacement for either.
Control humidity and prevent mould: targets and fixes homeowners can apply
Keep indoor relative humidity between 30 and 50%. Above that range, dust mites and mould spores multiply fast; below it, you’re looking at dry skin and irritated airways instead.
- Run bathroom and kitchen extractors every time you shower or cook, and let them run a few minutes after.
- Use a dehumidifier in damp basements or poorly ventilated rooms, particularly in winter.
- Fix leaks and wipe down condensation on windows and sills before it soaks into frames or plaster.
- Dry laundry outside where you can. It’s one of the biggest hidden moisture sources in a typical home.
Small mould patches under a square foot can usually be cleaned with detergent and water. Anything larger, recurring, or hidden inside walls or attics needs a professional look, especially if you can smell it before you can see it.
Simple monitoring: which devices to use and how to interpret results
A cheap CO2 monitor tells you whether a room is actually getting fresh air. Readings creeping past 1,000ppm mean it’s time to open a window or run the extractor, regardless of what the thermostat says.
- PM2.5 monitors flag particulate spikes fast. A jump straight after frying or lighting a candle confirms the source; if levels stay high afterwards, ventilation isn’t keeping up.
- Hygrometers are the cheapest and most useful device in this list. Check readings in the room where you’re seeing condensation, not just centrally.
- Consumer monitors, generally $20 to $80, are fine for spotting trends. If you need readings you can actually trust for a health decision, a professional assessment is worth the cost.
If numbers stay elevated after basic fixes, that’s your cue to call someone rather than buy another gadget.
Routine maintenance checklist and clear signs it’s time to hire a professional
A few recurring tasks keep everything above actually working, rather than quietly degrading over months.
- Change HVAC and purifier filters on the manufacturer’s schedule, not by eye.
- Clean extractor fan grilles every few months. Grease and dust build-up quietly kills airflow.
- Check window and door seals and confirm trickle vents aren’t painted shut or blocked by furniture.
- Test CO alarms monthly and replace batteries yearly.
Call a professional when mould keeps returning after cleaning, when monitor readings stay high despite following every step above, or when a room never seems to ventilate properly no matter what you try. HVAC systems installed or upgraded without proper commissioning can actually worsen airflow and filtration balance rather than fix it, which is exactly the kind of fault a homeowner can’t diagnose by eye. Akita’s ventilation and system upgrade guidance covers what a proper commission actually checks.
Pro Tip: Keep a written log of any recurring damp patches or smells with rough dates. It turns a vague “it happens sometimes” into evidence a technician can actually diagnose against.
Why professional commissioning and maintenance still matter
Most of the mistakes we see at Akita aren’t dramatic. They’re a ventilation system rebalanced after a loft conversion that nobody rechecked, a duct partially blocked for months, or a filter spec chosen for cost rather than for the system it’s fitted to. Each one quietly undoes the good habits homeowners are doing everything right to maintain.
How Akita can help with inspection, installation and ongoing air quality
Akita is the practical next step when DIY fixes have taken you as far as they can. Rather than guessing at filter specs or hoping a new extractor fan solves a ventilation imbalance, Akita’s engineers assess your actual airflow, humidity and system condition across homes in Suffolk, Norfolk, and Essex, and fix what’s genuinely wrong rather than what’s easiest to sell.
Booking starts with an on-site inspection and a written, fixed-price quote, no vague estimates that change once work begins. From there, homeowners can go ahead with a one-off fix, such as a filter upgrade or extractor recommissioning, or move onto a maintenance membership that keeps the whole system checked and serviced year-round. For anyone dealing with a musty attic that never quite clears, it’s also worth checking whether attic mould is quietly undermining the rest of your ventilation before booking, since that’s a common hidden cause behind readings that won’t budge.
If your home has felt stuffy, damp, or just “off” no matter what you’ve tried, start with a domestic air conditioning and ventilation assessment and get a proper answer instead of another guess.
Frequently asked questions
What is the fastest way to improve indoor air quality? Remove the pollution source first, whether that’s an unflued heater or a fragranced cleaner, then ventilate the room deliberately rather than leaving a window open all day.
How can I reduce indoor pollutants without spending money? Cook with lids on and the extractor running, dry laundry outside, and open windows on the quiet side of the house for short bursts after cooking or showering.
Do air purifiers actually work for indoor air quality? HEPA purifiers reduce particulates effectively, particularly during allergy season or smoke events, but they work best alongside source control and ventilation rather than instead of them.
What humidity level is best for indoor air quality? Between 30 and 50% relative humidity limits mould growth and dust mites while staying comfortable for most people.
When should I call a professional about indoor air quality? Call one when mould keeps returning after cleaning, monitor readings stay high despite basic fixes, or a room never seems to ventilate properly, since these usually point to a ventilation or system fault that needs proper diagnosis.
Sources
Most homes have three types of pollution running at once, often unnoticed. Combustion sources include gas hobs, candles, wood burners and open fireplaces. Particulate sources come from frying, grilling, smoking and log fires. VOC sources hide in paint, new furniture, air fresheners and aerosol cleaners, and damp corners breed mould spores that circulate for weeks.
Watch for these signs:
- Report on the environment: indoor air quality — EPA
- The Inside Story: A guide to indoor air quality — CPSC
Eliminating a source beats trying to ventilate or filter your way around it. The US EPA is explicit on this point: source control is usually the more effective first move, and it’s typically the cheapest one too.