<span style="color: #222222;">The overall air quality index in the national capital was in the 'moderate' category today after heavy rains and hailstorm washed away pollutants in the air. According to the Central Pollution Control Board (CPCB) data, the overall air quality index (AQI) of the city was at 142, which falls in the 'moderate' category. In the National Capital Region, Ghaziabad, Greater Noida, Noida and Gurgaon also recorded 'moderate' air quality, the CPCB data showed. The AQI may slowly buildup now and is predicted to remain in moderate category until tomorrow and thereafter will oscillate between moderate to poor.</span><br />