Why coughing and wheezing get worse at night in winter, explains doctor

Delhi pulmonologist Dr Vikas Mittal of CK Birla Hospital says air pollution, changing weather and airway sensitivity can worsen cough, wheezing and breathlessness at night. Fine PM2.5 particles inflame the airways, while winter temperature inversions trap pollutants near the ground. People with asthma or COPD are most vulnerable, though symptom timing alone cannot pinpoint the cause.