Air quality in Delhi remained in the poor category on Tuesday as the city woke up to a thick, pale haze. According to the latest Air Quality Index (AQI) data, the air quality of Delhi’s Lodhi Road area showed levels of prominent pollutants PM (particulate matter) 2.5 and PM 10 at 280 and 280 respectively. The stubble burning in the neighbouring states is major contributor to air pollution in National Capital Region (NCR).