Air pollution is typically associated with breathing problems, allergies and asthma. It can also be more serious than that. Long-term exposure to polluted air can increase lung cancer even if you’ve never smoked. With vehicle emissions, industrial smoke and dust in many cities, we must be able to recognize this link.
Can air pollution cause lung cancer in non-smokers?
Yes. The World Health Organization (WHO) acknowledges outdoor air pollution as a cause of lung cancer. Smoking is still the leading risk factor, but people who have never smoked can be at risk of developing lung cancer.
Air pollution does not mean that everyone exposed to it will develop cancer; there is no single case of cancer. Longer exposure can increase the risk, depending on pollution levels, duration of exposure, and other individual factors.
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The US National Cancer Institute has also reported links between fine particle air pollution and cancer-related genetic changes in people who have never smoked.
How does air pollution affect the lungs?
Air pollution contains a mixture of harmful substances, such as fine particulate matter, gases and chemicals released by vehicles, factories, power plants and the burning of fuels.
Fine particulate matter (PM2.5) is a particular hazard because its particles are small enough to penetrate the lungs.
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Repeated exposure can cause inflammation and cell damage. Research also suggests fine particle pollution can also lead to genetic changes that are associated with cancer. Over time, these processes can increase lung cancer risk.
Which pollutants increase the risk?
Several sources of pollution can affect lung health.
1. PM2.5 particles: The tiny particles are created through vehicle emissions, industrial emissions, fuel combustion and others.
2. Vehicle emissions: Traffic-related pollution, including diesel exhaust, can expose people to toxic airborne particles.
3. Industrial smoke: Some industrial processes release particles and chemicals that may damage the respiratory system.
4. Household air pollution: Unventilated air pollution from burning wood, coal and other solid fuels in poorly ventilated spaces can also affect lung health in the home.
5. Secondhand smoke: Breathing tobacco smoke produced by others is another recognised lung cancer risk factor, even for people who do not smoke themselves.
What are the warning signs of lung cancer?
Lung cancer may not show noticeable symptoms even in the early stages. When symptoms do show up, they can include:
- A persistent cough that does not improve.
- Coughing up blood.
- Chest pain or discomfort.
- Shortness of breath.
- Repeated chest infections.
- Unexplained weight loss or persistent fatigue.
These symptoms can also occur with other conditions. However, a persistent cough, blood in the cough or unexplained breathing problems should be medically assessed. Do not assume that symptoms are caused only by pollution.
How can one reduce exposure to air pollution?
It is not possible to eliminate all exposure, but there are some ways to minimize exposure.
- Check local air quality reports before planning outdoor activities.
- When pollution is high, limit outdoor exercise.
- When the particle pollution is heavy, it may be appropriate to use an N95 or equivalent respirator.
- Keep indoor spaces well ventilated if outdoor air quality is acceptable and consider air filtration.
- Avoid smoking and exposure to secondhand smoke.
- Reduce indoor smoke by using cleaner cooking fuels and ensuring proper ventilation.
These measures can decrease exposure, but they cannot completely eliminate the risk of lung cancer.
Conclusion
Air pollution can increase the risk of lung cancer in non-smokers, making clean air an important public-health priority. Fine particles, traffic emissions and household smoke are among the sources that should be looked at.
Not all who are exposed to polluted air will develop lung cancer and lung cancer can have a variety of causes. Exposure reduction strategies, awareness of warning signs and seeking medical help when symptoms remain are critical for improving lung health.
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