Why Is Poor Air Quality More Dangerous for Vulnerable Groups?
Air pollution does not affect everyone equally. Children and the elderly are the most vulnerable during episodes of poor air quality, as their respiratory and immune systems have physiological differences that make them more susceptible to pollutants. While a healthy adult may tolerate certain pollution levels without immediate consequences, in these groups the effects can be severe and long-lasting.
Effects of Poor Air Quality on Children
Children breathe faster than adults and, relative to their body weight, inhale a larger volume of air. Additionally, they spend more time outdoors, increasing their exposure to pollutants such as particulate matter (PM2.5 and PM10), nitrogen dioxide, and ground-level ozone.
Acute Respiratory Problems
Exposure to high pollution levels can trigger asthma attacks, bronchitis, and pneumonia. According to the World Health Organization, 93% of the world's children breathe air that exceeds recommended limits, resulting in millions of emergency visits each year.
Compromised Lung Development
Longitudinal studies have shown that children growing up in areas with poor air quality have reduced lung capacity compared to those living in clean environments. This loss is irreversible and increases the risk of chronic diseases in adulthood.
Neurological and Cognitive Effects
Recent research links prenatal and early-life exposure to pollutants with cognitive development issues, lower academic performance, and behavioral disorders such as ADHD. Ultrafine particles can cross the blood-brain barrier and cause brain inflammation.
Impact of Pollution on the Elderly
In older adults, the natural aging of the respiratory and cardiovascular systems combines with pre-existing conditions like hypertension, diabetes, or COPD. Poor air quality acts as an aggravating factor that can trigger serious events.
Cardiovascular Diseases
Exposure to fine particles increases the risk of heart attacks, strokes, and arrhythmias. A study by the American Heart Association indicates that for every 10 µg/m³ increase in PM2.5, the risk of cardiovascular death rises by 8% to 18% in people over 65.
Exacerbation of Chronic Respiratory Diseases
Ozone and particles irritate the airways, causing COPD exacerbations and worsening lung function. This leads to more hospitalizations and a lower quality of life, especially during wildfire or thermal inversion episodes.
Accelerated Cognitive Decline
Multiple studies have found an association between long-term pollution exposure and an increased risk of dementia and Alzheimer's disease. Fine particles can trigger neuroinflammation and amyloid plaque buildup, accelerating cognitive decline.
Practical Tips to Protect Children and the Elderly
During poor air quality alerts, it is essential to take preventive measures to minimize exposure. Here are some tips based on health agency recommendations:
- Monitor the Air Quality Index (AQI) through apps like Contingencias, which provide real-time alerts for your area.
- Reduce outdoor activities when the AQI exceeds 100 (orange level). For children and the elderly, avoid intense exercise when the level is yellow or higher.
- Keep doors and windows closed during high pollution episodes. Use air purifiers with HEPA filters in rooms where they spend the most time.
- Wear N95 or KN95 masks if going out is necessary. Surgical masks do not effectively filter fine particles.
- Stay properly hydrated and maintain a diet rich in antioxidants (vitamins C and E) to help the body combat oxidative stress caused by pollutants.
- Consult a doctor for persistent symptoms such as coughing, shortness of breath, or unusual fatigue. In children, watch for wheezing or rapid breathing.
The Role of Early Warnings in Prevention
Having timely information makes a difference. The Contingencias app allows you to receive personalized notifications about air quality in your area, along with specific recommendations for vulnerable groups. By staying informed, you can plan activities and protect the youngest and oldest members of your family.
Poor air quality is a growing problem in many South American cities due to urbanization, vehicle traffic, and wildfires. Understanding its effects and taking proactive measures is key to reducing the health impact on those who need it most.