<span style="color: #222222;">The air quality in Delhi-NCR region deteriorated further and reached to severe category Thursday morning. </span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">According to the System of Air Quality and Weather Forecasting and Research, SAFAR, PM10 pollutants was recorded in the severe category with 535 level whereas the PM2.5 level was registered at 358. </span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">Share of stubble burning has considerably increased to 42 per cent in Delhi's pollution which is maximum so far in this season. </span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">SAFAR has predicted that the air quality will remain in the very poor category tomorrow.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">It has been suggested to the people to avoid all physical activities outside.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">On Wednesday, a thick blanket of haze has covered Delhi leading to low visibility on the city roads as air quality has started sudden deterioration from noon.</span>