<span style="color: #222222;">National Capital Delhi's air quality is in the poor category today morning as the air quality index, AQI was recorded at 263 at 7 AM.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">The city has been struggling with very poor air quality since the beginning of winter season.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">It deteriorated during the Diwali week.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">Spike in farm fires, calm winds and other local factors are among the reasons for deteriorating air quality in Delhi.</span><br />''