Clean Air

Clean Air: Why It Matters More Than Ever

We often think of air pollution as something “out there”—smoggy cities or industrial zones. But the truth is, the air we breathe indoors—at home, at school, at work, and on public transport—can have just as much impact on our health.

In modern life, we spend up to 90% of our time indoors. That makes indoor air quality one of the most important—and overlooked—health factors of our time.

1. Health Impacts: More Than Just Breathing

Poor air quality affects far more than the lungs.

Pollution

Fine particles (PM2.5), dust, and chemical pollutants can:

  • Trigger asthma and respiratory disease
  • Increase risk of heart disease
  • Contribute to long-term inflammation

Viruses (Airborne Transmission)

Illnesses such as influenza and COVID-19 spread through tiny airborne particles that can linger in enclosed spaces—especially where ventilation is poor.

Allergies

Indoor air often contains:

  • Dust mites
  • Mould spores
  • Pet dander
  • Pollen brought inside

These can lead to chronic symptoms like sneezing, fatigue, headaches, and poor sleep.

2. The Air Conditioning Myth

Since the widespread use of air conditioning, a common misconception has taken hold: that all systems bring in fresh air.

In reality:

  • Most residential and many commercial systems simply recirculate indoor air
  • Only certain systems (with mechanical ventilation or “fresh air intake”) introduce outside air

This means:

  • Pollutants build up over time
  • Viruses can circulate within enclosed spaces
  • CO₂ levels rise, leading to fatigue and reduced concentration

Whatever Happened to Opening a Window?

Natural ventilation—simply opening windows—remains one of the most effective ways to:

  • Dilute indoor pollutants
  • Reduce virus concentration
  • Improve oxygen levels

And in coastal areas, this simple act becomes even more powerful.

3. Coastal Advantage: Working With Sea Breezes

Living along the coast offers something many inland areas don’t: reliable, natural airflow.

In places like Scarborough, the daily sea breeze (often called the “Fremantle Doctor”) provides a powerful, free way to flush out indoor air and bring in fresh, oxygen-rich air from the ocean.

How Sea Breezes Improve Air Quality

  • Dilution of pollutants: Fresh coastal air reduces indoor contaminants and odours
  • Removal of airborne viruses: Constant air exchange lowers the concentration of infectious particles
  • Cooling effect: Reduces reliance on recirculating air conditioning systems
  • Mental clarity: Higher oxygen and lower CO₂ levels support focus and wellbeing

How to Use Sea Breezes Effectively

  • Open windows on opposite sides of your home to create cross-ventilation
  • Take advantage of afternoon and early evening breezes
  • Allow air to move through internal spaces by opening doors
  • Use a short daily “air flush” (15–30 minutes) to refresh indoor air
  • Let cooler evening air flow through overnight in summer

A Smarter Balance

Modern homes are often sealed for energy efficiency—but in doing so, they can trap heat, moisture, and pollutants.

In a coastal climate, the smarter approach is balance:

  • Use natural ventilation when conditions allow
  • Use air conditioning and filtration when needed

4. Buildings and Shared Air

Commercial Buildings

Offices and shopping centres often rely on central HVAC systems. If poorly maintained or inadequately filtered:

  • Air is shared across large groups
  • Pollutants and pathogens can circulate

Public Venues

Theatres, stadiums, and concert venues concentrate thousands of people indoors:

  • High CO₂ levels are common
  • Ventilation design becomes critical

Hotels

Guests cycle through rooms frequently:

  • Ventilation and filtration directly affect exposure risk

5. Public Transport: Air in Motion

Spaces like buses, trains, taxis, and planes are enclosed and shared.

  • Buses & trains: Often rely on recirculated air
  • Planes: Many use HEPA filtration (a positive example)
  • Taxis/rideshare: Air quality varies depending on ventilation habits

These environments highlight how quickly air can be shared—and why filtration matters.

6. Schools: Air Quality and Learning

Children are especially vulnerable to poor air quality.

Research shows:

  • High CO₂ levels reduce concentration and cognitive performance
  • Poor ventilation increases spread of illness
  • Exposure to pollutants can affect long-term development

Improving air in classrooms isn’t just about health—it directly impacts learning outcomes.

7. Homes and Apartments: Hidden Air Risks

Our homes should be safe havens—but modern materials and lifestyles can degrade indoor air.

Sources of Indoor Pollution

  • Paints, varnishes, and adhesives
  • Carpets and synthetic furnishings
  • Cleaning products and air fresheners
  • Laundry detergents with strong fragrances

Many of these release volatile organic compounds (VOCs)—some of which act as endocrine disruptors, interfering with hormone systems.

8. Practical Ways to Improve Air Quality

The good news: there are simple, effective steps we can take.

Ventilation

  • Open windows regularly (cross-ventilation is best)
  • Use natural airflow—especially coastal sea breezes
  • Use exhaust fans in kitchens and bathrooms

Filtration

  • Use air purifiers with HEPA filters
  • Maintain HVAC systems and upgrade filters where possible

Monitoring

  • CO₂ monitors help indicate ventilation quality
  • High CO₂ = stale, rebreathed air

Reduce Chemical Load

  • Choose low-VOC paints and furnishings
  • Use fragrance-free or low-tox cleaning products
  • Avoid synthetic air fresheners

Everyday Habits

  • Dry laundry outdoors when possible
  • Vacuum with HEPA-filter vacuums
  • Introduce fresh air daily—even in winter

9. A Public Health Opportunity

If homes, schools, and buildings widely adopted:

  • Better ventilation
  • HEPA filtration
  • Air quality monitoring

We could significantly reduce the spread of airborne illnesses like flu and COVID-19—while also improving long-term health.

Final Thought: Air Is Shared

Air is one of the few resources we all share, constantly and invisibly.

Improving air quality isn’t just a personal choice—it’s a community responsibility. From opening a window to rethinking building design, small changes can have a powerful impact on health, learning, and wellbeing.

And along the coast, one of the simplest solutions is already there—waiting at the window.