Thousands of Delhi-NCR residents are rushing to Dehradun to escape pollution. However, the Air Quality Index (AQI) in Dehradun has also slipped into the 'poor' category. Dehradun's real-time AQI on Wednesday fluctuated between 260 and 300, worsening sharply after sunset. Notably, the AQI readings in Uttarakhand's capital city still remain significantly lower than Delhi's.