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Air Pollution and Lung Health: How PM2.5 Affects Your Lungs and How to Protect Them

Understanding the air you breathe, and what you can do about it.

Quick answer

Air pollution irritates and inflames the airways. Fine particles (PM2.5) are small enough to reach deep into the lungs, while ozone and nitrogen dioxide from traffic irritate the airway lining. Exposure can cause coughing, wheezing and shortness of breath and, over time, is linked to reduced lung function. To protect your lungs, check the Air Quality Index, limit outdoor exercise on high-pollution days and near busy roads, keep windows closed during pollution peaks, use a HEPA air purifier, wear a well-fitted N95 mask when air quality is very poor and avoid smoke.

Key takeaways

According to the World Health Organization, almost everyone on Earth breathes air that exceeds its air-quality guidelines. Here is what that means for your lungs.

The main pollutants

Fine particles (PM2.5)

Particles under 2.5 micrometres, about 30 times thinner than a human hair, from traffic, industry, wildfires and wood burning. They can travel deep into the lungs.

Ozone

Formed when sunlight reacts with traffic and industrial emissions; highest on hot, sunny afternoons.

Nitrogen dioxide (NO2)

Mainly from vehicle exhausts, highest near busy roads.

Reading the Air Quality Index (AQI)

AQILevelWhat to do
0–50GoodEnjoy outdoor activity
51–100ModerateSensitive people take it easier
101–150Unhealthy for sensitive groupsReduce long outdoor exertion
151–200UnhealthyLimit time outdoors
201+Very unhealthy / hazardousStay indoors, use filtration

8 ways to reduce exposure

Check the AQI each morning; exercise in parks rather than beside busy roads; avoid rush-hour walking routes; keep windows closed during pollution peaks; run a HEPA purifier; set car ventilation to recirculate in traffic; wear an N95 mask on very bad days; and never smoke. Daily airway support, such as LungExpand Pro with ivy leaf and serratiopeptidase for natural airway clearing, can complement these habits.

Higher risk: children, older adults, pregnant women and people with asthma, COPD or heart disease are more sensitive to pollution. If symptoms worsen on high-pollution days, talk to your doctor about an action plan.

Sources

  1. World Health Organization – "Ambient (outdoor) air pollution" fact sheet.
  2. U.S. EPA – "Air Quality Index (AQI) basics," AirNow.gov.
  3. American Lung Association – "State of the Air" report.

Common questions

What is PM2.5?

Fine airborne particles under 2.5 micrometres that can reach deep into the lungs.

What AQI is unhealthy?

Above 100 for sensitive groups and above 150 for everyone.

Do masks help with air pollution?

Well-fitted N95 masks can filter fine particles; cloth masks do little.

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