Seasonal worsening — particularly October–November in Delhi, when stubble burning and Diwali coincide — is extremely common in asthmatic children. But seasonal severity does not mean the asthma is absent at other times. The underlying airway inflammation of asthma is typically present year-round — it is simply amplified to clinical severity during the worst pollution and allergen periods. At Pulmovista Clinics, I use spirometry and FeNO to measure baseline airway inflammation between the worst seasons. If these show significant residual inflammation even in ‘good’ months, year-round controller therapy is indicated — because each October without adequate protection risks another severe exacerbation.