By Shishir Prashant 
PrashantNews
Air quality showed an improvement in both Dehradun and Delhi on Tuesday, with the national capital recording a significant decline in pollution levels and moving out of the ‘Very Poor’ category, according to the Central Pollution Control Board (CPCB).
According to the latest air quality data, Dehradun recorded an average AQI of 104, placing it in the ‘Moderate’ category, while Delhi’s average AQI stood at 299, bringing it to the upper end of the ‘Poor’ category.
The improvement was particularly noticeable in Delhi, where the AQI had stood at 344 on Monday, November 9. The index thus declined by 45 points in a day. On November 8, the national capital had recorded an AQI of 376.
Dehradun, meanwhile, continued to record relatively better air quality, with its AQI remaining in the Moderate category at 104, a big improvement from the Monday’s level of 257.
According to the monitoring data, PM2.5 was the predominant pollutant in Dehradun, while both PM10 and PM2.5 contributed to pollution levels in Delhi.
The improvement in Delhi comes in the aftermath of Diwali, when firecracker emissions, coupled with unfavourable weather conditions, contributed to elevated pollution levels. However, with the AQI still close to 300, the national capital continues to experience poor air quality.