NEW DELHI: The capital has recorded its worst air quality in 287 days on Tuesday, with the Air Quality Index (AQI) climbing to 350, and 10 monitoring stations r. Delhi last recorded a higher AQI on January 20 this year settling at 378.Of the 57 air quality monitoring stations in the city, 10 recorded severe air quality, 35 were in the very poor category and 12 reported poor air quality.