Walking pneumonia, a milder form of lung infection often mistaken for a cold or flu, is increasing in cities like Delhi and Mumbai due to worsening air pollution. It primarily affects children and young adults, causing persistent cough, low-grade fever, and fatigue. Walking pneumonia, a milder form of lung infection often mistaken for a cold or flu, is increasing in cities like Delhi and Mumbai due to worsening air pollution. It primarily affects children and young adults, causing persistent cough, low-grade fever, and fatigue. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle