NEW DELHI: Toxic smog hung over the city on Monday and more stations recorded ‘severe’ air quality, even though the overall Air Quality Index of the capital remained in the upper levels of the ‘very poor’ zone. The smog that had formed in the morning persisted through the day due to calm wind conditions and pollution kept soaring as the day passed. The city’s average AQI was 373 at noon and worsened to 380 by 3pm and 386 by 6pm. For Delhiites, it was the familiar November air nightmare all over again with many complaining of itchy eyes, mild headaches and difficulty in breathing as pollution levels kept soaring, with a possible spike in NO2 and ozone, experts said. During the morning hours, a total of eight city areas were in the "severe" category, with Anand Vihar, with an AQI of 425, bei...