<p>Delhi’s air quality hovered around the 'severe' category for the second day in a row on November 4, with an AQI reading of 381, according to data released by the Central Pollution Control Board.</p><p>The national capital has witnessed six consecutive days of 'very poor' air quality, with the air quality index staying above 300. A reading of 400 signifies 'severe' air quality.</p><p class="lastPara">It was not just the national capital.&nbsp;Metros like Mumbai, Kolkata and Hyderabad too continued to record AQI readings of above 100.</p><p style="display:block;">Mumbai’s AQI was above 100 for a fifth consecutive day, while Hyderabad has witnessed eight straight days of above 100 AQI. Chennai had the cleanest air among the metros, with an AQI level of 56 on November 4, while tech hub Bengaluru had an AQI of 69.</p>