Do you often take a walk early in the morning? If so, health experts suggest reconsidering your routine, especially during the cold season, as walking early in the morning can be detrimental to your health.
In winter, air pollution levels are higher compared to summer, with cold air lingering closer to the ground until sunrise. This prevents pollutants like dust, smoke, and carbon monoxide from dispersing. Experts recommend waiting until after sunrise for your morning walk, as the air becomes less polluted once the sun warms the ground.
The Science Behind Winter Pollution
Environmental expert Bhushan Tuladhar explains that cold air near the ground in winter traps pollutants, making the morning air more harmful. “During winter, it’s healthier to go outside after sunrise. Warm air rises after the sun comes up, reducing ground-level pollution,” Tuladhar said. He added, “At night, the ground cools rapidly, and the cold air traps pollution close to the surface.”
Pollution is particularly severe in areas like Kathmandu Valley, where the topography makes it difficult for air to escape. Additionally, garbage burning, biofuel use (firewood and coal), and liquid petroleum gas consumption for heating and cooking rise during winter, worsening air quality.
“According to the 2078 National Census, 51% of Nepalis still burn firewood, and 3% use kerosene. This contributes significantly to indoor pollution, which disproportionately affects women and children,” Tuladhar noted. He also highlighted a recent study indicating that air pollution causes 48,500 deaths annually in Nepal.
Winter conditions further intensify pollution due to inefficient fuel combustion in vehicles, leading to higher emissions of carbon monoxide and nitrogen oxides. Rural practices like burning straw and organic waste, as well as the operation of brick kilns and coal-based industries, add to the problem. Tuladhar warned that pollution levels could rise further if brick kilns restart production after mid-February.
Environmental activist Barsha Parajuli emphasized that colder winter mornings exacerbate pollution levels, as fog traps harmful particles near the ground.
Health Risks from Morning Pollution
Cardiologist Dr. Ranjit Sharma cautions that pollution is particularly harmful before sunrise, especially for heart patients. “While pollution affects everyone, it is more dangerous in the morning. Heart patients should avoid going out early,” he said.
Dr. Sharma advises individuals with heart conditions, high blood pressure, diabetes, high cholesterol, asthma, and chronic illnesses to exercise later in the morning. He explained that during winter, increased hormone levels cause higher blood viscosity and narrowed blood vessels, leading to abnormal blood flow. This can increase the risk of heart attacks, strokes, and blood clots.
“Always wear warm clothing and masks when stepping out, and try to go out only after the sun has risen,” he suggested.
Public health expert Dr. Samir Adhikari also warns that increased air pollution can cause severe health issues, including respiratory problems, colds, asthma, lung cancer, high blood pressure, strokes, and heart attacks. -- RSS
