KATHMANDU, APRIL 30 Air quality in the Kathmandu Valley has improved significantly after deteriorating sharply last week, aided by recent rainfall and winds. Pollution levels, which had surged due to prolonged dry weather and widespread forest fires, have begun to decline. The Air Quality Index (AQI), which had reached 247 last week-falling in the 'very unhealthy' category-has now dropped to 79. Although the current level is classified as 'moderate,' it still indicates some health risk, particularly for sensitive groups. Last week, Kathmandu was ranked as the world's most polluted city, but has now improved to 26th position, according to AQI data. As per AQI standards, a reading of 0–50 is considered 'good,' 51–100 'moderate,' 101–150 'unhealthy,' 151–200 'unhealthy for all,' 201–300 'very unhealthy,' and above 300 'hazardous.' Director General of the Department of Environment, Gyanendra Subedi, attributed the improvement to recent rainfall and strong winds. He said prolonged dry conditions lead to accumulation of dust and smoke, while forest fires further worsen pollution, with smoke settling in the Valley. Cross-border air pollution from neighbouring India also contributes to deteriorating air quality, he added. Subedi stressed the need for effective implementation of sustainable and environment-friendly measures to control pollution in the long term. (With inputs from RSS)