National Capital Delhi's air quality is in the 'poor' category today morning as the air quality index, AQI was recorded at 291 at 7 AM.<br />'' <br />''The city has been struggling with very poor air quality since the beginning of winter season and it worsened during Diwali.<br />'' <br />''<span style="color: #222222;">Spike in farm fires, calm winds and other local factors were among the reasons for deteriorating air quality in Delhi.</span><br />