Panchkula, Oct 21 (UNI) Air quality remained ''poor'' across much of Delhi and the National Capital Region (NCR) on Wednesday, with Khora in Ghaziabad district recording the highest Air Quality Index (AQI) of 317 in the ''very poor'' category, while Delhi registered 245, Greater Noida 280, Noida 249 and Gurugram 216, according to the NCR air quality bulletin. .