A thick haze in Kathmandu Valley has pushed the Air Quality Index (AQI) to a hazardous level of 333, causing disruptions at Tribhuvan International Airport on March 31st. Flights from Jazeera Airways, Air India, and Fly Dubai were diverted due to low visibility. The PM2.5 AQI of 209.8 µg/m³ poses severe health risks, as these particles can enter the lungs and bloodstream, leading to respiratory and heart diseases. Kathmandu's pollution is nearly five times higher than WHO's recommended limit, affecting public health and straining the economy.