On Sunday, Delhi's air quality index (AQI) hit 366, which is considered "very poor." Other cities like Patna, Chandigarh, and Kolkata reported "poor" air quality. Aizawl had the cleanest air with an AQI of 50, which falls under the "good" category. Major cities across India showed different pollution levels, with some places experiencing "moderate" and "satisfactory" air quality.