Why is respiratory health important?
Breathing is something we usually notice only when it becomes difficult. Respiratory health affects our ability to learn, play, sleep, exercise and participate in everyday life.
The respiratory system brings oxygen into the body and removes carbon dioxide. It works closely with the cardiovascular system to deliver oxygen to tissues throughout the body.
Respiratory health is influenced by much more than individual choices. Tobacco smoke, household and outdoor air pollution, infections, allergens, occupational exposures, housing conditions, climate-related hazards and access to healthcare can all influence respiratory health.
Conditions such as asthma and chronic obstructive pulmonary disease (COPD) can affect people across the life course. Respiratory infections can also cause substantial illness, particularly among young children, older adults and people living with other health vulnerabilities.
If the air we breathe is shared, who is responsible for making that air healthier?
Personal hints
Start with your own experience—but then look beyond yourself to the conditions that shape respiratory health.
Ask yourself
- What does comfortable, healthy breathing feel like?
- What kinds of air do I breathe at home, at school and outdoors?
- How does my breathing change during physical activity?
- What information would help me understand respiratory health better?
Look beyond yourself
A person can experience respiratory problems even when they are doing everything reasonably possible to protect their health.
Housing, income, transportation, workplace conditions, environmental pollution and access to healthcare can influence the opportunities people have to breathe healthy air.
Explore
Let's build a common language for understanding respiratory health.
Respiratory system
The organs and structures involved in breathing, including the airways and lungs.
Airway
A passage through which air travels into and out of the lungs.
Asthma
A chronic respiratory condition involving inflammation and narrowing of the airways that can cause symptoms such as wheezing, coughing and difficulty breathing.
COPD
Chronic obstructive pulmonary disease is a chronic lung disease involving persistent airflow limitation and breathing difficulties.
Air pollution
Contamination of indoor or outdoor air by substances that can harm human health or the environment.
Occupational exposure
Contact with potentially harmful substances or conditions during work.
Ventilation
The movement and replacement of indoor air. Good ventilation can help improve indoor air quality.
Respiratory infection
An infection affecting parts of the respiratory system, ranging from mild illness to severe disease.
Learn
Understanding respiratory health means connecting biology, environment, prevention, healthcare and society.
How does breathing work?
When we breathe in, air travels through the nose or mouth, through the airways and into the lungs. Oxygen passes from the lungs into the bloodstream, while carbon dioxide moves from the blood into the lungs and is breathed out.
Breathing is therefore not only a lung function. The respiratory and cardiovascular systems work together to deliver oxygen throughout the body.
Asthma
Asthma can affect children, adolescents and adults. Symptoms can include coughing, wheezing, chest tightness and difficulty breathing.
Symptoms can vary over time and may be triggered or worsened by factors such as allergens, smoke, air pollution, respiratory infections, exercise or cold air.
Asthma can be managed. Appropriate care can help people participate fully in education, physical activity, relationships and everyday life.
Chronic obstructive pulmonary disease
COPD is a chronic respiratory disease that can make breathing increasingly difficult.
Tobacco smoke is an important risk factor, but it is not the only one. Long-term exposure to household air pollution, outdoor air pollution, dusts, fumes and chemicals can also contribute to respiratory disease.
Respiratory infections
Respiratory infections range from relatively mild illnesses to severe diseases such as pneumonia.
Their effects can be influenced by vaccination access, living conditions, nutrition, indoor air quality, healthcare access and other social and environmental factors.
Prevention, appropriate vaccination where recommended, infection prevention and timely access to healthcare can reduce serious illness.
Tobacco and respiratory health
Tobacco smoke damages the respiratory system and is associated with respiratory diseases, cardiovascular diseases and several cancers.
Respiratory-health action therefore includes both supporting people who use tobacco to quit and creating environments that reduce exposure to tobacco smoke.
Air pollution and the lungs
Fine particulate matter and other air pollutants can affect the respiratory system and contribute to respiratory and cardiovascular disease.
Major sources can include transportation, industry, energy production, household fuels, agriculture and landscape fires. The importance of each source varies by place.
This makes clean air a population-health issue. Individual action alone cannot solve pollution generated by large-scale systems.
Climate change and respiratory health
Climate-related hazards can affect respiratory health. Wildfire smoke, extreme heat, changing allergen patterns and other environmental changes can create additional risks in some communities.
Climate action can therefore also be health action.
Think
Critical-thinking questions
- Why might two young people living in different neighbourhoods experience different respiratory risks?
- If someone develops asthma, is it reasonable to assume that they caused it themselves? Why or why not?
- Why might improving air quality benefit people who do not have a diagnosed respiratory disease?
- Should responsibility for reducing air pollution belong mainly to individuals, governments, industries—or all of them?
- How could poverty influence both exposure to respiratory risks and access to treatment?
- Why might the same environmental exposure affect different communities differently?
Connect: from Self to World
Respiratory health becomes a global-health issue as our circle of understanding expands.
My breathing
Learn how the respiratory system works and why clean air matters.
Our shared air
Think about smoke exposure, indoor air quality, ventilation and respiratory infections.
Local environments
Explore traffic, wildfire smoke, industrial emissions, housing and school environments.
Public policy
Ask how governments regulate air pollution, tobacco, occupational hazards and respiratory healthcare.
Global respiratory health
Compare respiratory disease burdens and access to clean air, prevention, medicines and healthcare across countries.
Social Determinants of Health
Where people live, learn, work and age can shape the air they breathe and the care they can access.
Respiratory health is influenced by social, economic, environmental and health-system conditions.
- Housing: overcrowding, dampness, mould, poor ventilation and indoor pollution can affect respiratory health.
- Income: can influence housing quality, transportation, exposure to hazards and access to healthcare.
- Work: dusts, fumes, chemicals and other occupational exposures can damage respiratory health.
- Education: can influence access to reliable health information and the ability to navigate health services.
- Environment: outdoor air pollution, wildfire smoke and other climate-related hazards can affect breathing.
- Healthcare access: determines whether people can obtain diagnosis, appropriate medicines and ongoing care.
- Location and infrastructure: transportation systems, urban planning, industry and energy systems can influence exposure to air pollution.
Can we ask everyone to "breathe healthy air" when some people have far less control over the air surrounding them?
Sustainable Development Goals
Respiratory health connects health with environmental, social, economic and climate goals.
SDG 3 is the most direct connection, but respiratory health also depends on clean energy, sustainable cities, reduced inequality, responsible production and climate action.
This illustrates an important global-health principle: health outcomes are often produced by systems far beyond the health sector itself.
Global Leadership & Evidence
Who leads respiratory-health action?
- World Health Organization (WHO) — develops global guidance and monitors respiratory diseases, air pollution, tobacco and health-system responses.
- UN Environment Programme (UNEP) — works on environmental policy and action relevant to air quality.
- National, provincial and local health authorities — conduct surveillance, prevention, health promotion and healthcare delivery.
- Environmental and occupational authorities — regulate and monitor environmental and workplace exposures.
- Scientific and professional organizations — generate evidence, clinical guidance and research on respiratory diseases.
- Universities and research institutions — study respiratory disease, environmental exposures, prevention, treatment and health equity.
Global health knowledge is produced by many partners. Young people should learn not only what the evidence says, but also who produces it, how it is monitored and why evidence may change over time.
Global Evidence Date
Respiratory-health evidence evolves as new surveillance data, environmental measurements, research findings and clinical guidance become available.
GHE therefore treats this module as living evidence, not a static textbook.
Reflect
My reflection
What surprised you most about the relationship between breathing and the environment?
What respiratory-health question would you like to investigate further?
Equity reflection
Which groups might have less control over the quality of the air they breathe?
What could communities and governments do to reduce those inequalities?
Global reflection
Why might respiratory-health priorities differ between countries?
What responsibilities should countries share when environmental risks cross borders?
Act
- Learn how to identify reliable respiratory-health information.
- Support smoke-free environments and respect the health of people affected by second-hand smoke.
- Learn how local air quality is monitored and communicated.
- Help reduce stigma toward people living with asthma, COPD or other respiratory conditions.
- Explore how schools, homes and public buildings can support healthier indoor environments.
- Investigate how transportation, energy and urban policies affect the air people breathe.
- Ask how respiratory healthcare can become more accessible and equitable.
- Use evidence to participate constructively in conversations about clean air and environmental health.
I can make healthy choices for myself, and I can help create healthier conditions for others.
Test Your Thinking: 10 MCQs
These questions test knowledge, interpretation, application, social determinants of health, Sustainable Development Goals, health-system responsibility and global-health thinking.
1. What is the main function of the respiratory system?
Answer: B
2. Which statement about asthma is most accurate?
Answer: C
3. Which exposure is an important risk factor for COPD?
Answer: A
4. Why is air pollution a population-health issue?
Answer: B
5. Which example best illustrates a social determinant of respiratory health?
Answer: A
6. A worker is repeatedly exposed to harmful dust at work. Which response best reflects public-health thinking?
Answer: B
7. Which SDG is most directly connected with respiratory health?
Answer: A
8. Why can improving public transportation contribute to respiratory health?
Answer: A
9. Which statement best represents health equity?
Answer: B
10. Which action best represents the GHE philosophy?
Answer: B