Kathmandu, December 25
If you are an early riser who heads out for a morning walk at dawn, it might be time to reconsider your routine. Health experts suggest that walking early in the morning during winter may do more harm than good.
In winter, the air tends to be more polluted compared to summer. Cold air remains trapped near the ground until sunlight disperses it, increasing the likelihood of exposure to polluted air during early morning walks. Experts recommend waiting until after sunrise when the air is cleaner.
Environmental expert Bhushan Tuladhar explained that cold air near the ground during winter mornings is more polluted than during other seasons. “It’s better to go out after the sun is up, as the warm air rises, reducing pollution near the ground,” he said. Cold air traps pollutants like dust, smoke, and carbon particles, which can harm health when inhaled.
Kathmandu Valley, in particular, struggles with air circulation, making pollution levels worse during winter. Tuladhar noted that increased use of wood, coal, and biomass fuels for heating and cooking in both urban and rural areas contributes significantly to pollution.
“According to the 2021 census, 51% of Nepali households still use firewood, and 3% use dung for fuel,” Tuladhar said. “Indoor pollution affects women and children the most, and air pollution is linked to 48,500 annual deaths in Nepal.”
Vehicular emissions also worsen winter air quality, as combustion efficiency drops, releasing higher levels of carbon monoxide and nitrogen oxides. In rural areas, the burning of straw, plastic, and other waste for warmth adds to the pollution.
Impact on heart patients
Cardiologist Dr Ranjit Sharma warned that heart patients are particularly vulnerable to morning pollution during winter. “Pollution can affect health at any time, but it is worse in the morning. Heart patients should avoid going outside early,” he said. He advised those with heart conditions, high blood pressure, diabetes, high cholesterol, and chronic respiratory illnesses to exercise later in the day.
Cold weather increases blood viscosity, narrows blood vessels, and can reduce oxygen supply to the heart, forcing it to work harder. This can lead to complications like heart attacks or strokes, Dr Sharma added.
To stay safe, experts recommend wearing warm clothes, using masks, and waiting until the sun has warmed the air before venturing outdoors.
— Pragati Dhakal/RSS
