<p class="title">The skies over the national capital were a smoky grey on Tuesday as the sun struggled to shine through the haze with the air quality deteriorating and slipping into the "severe" category in several places in the city.</p>.<p class="bodytext">At 12.30 pm, the city’s overall air quality index was 390 -- marginally better than Monday's high of 397 at 8 pm -- according to the Central Pollution Control Board.</p>.<p class="bodytext">Pollution levels in the satellite towns of Ghaziabad (429), Greater Noida (418), and Noida (427) were worse.</p>.<p class="bodytext">An AQI between 0-50 is considered “good”, 51-100 “satisfactory”, 101-200 “moderate”, 201-300 “poor”, 301-400 “very poor”, and 401-500 “severe”. Above 500 is “severe-plus emergency” category.</p>.<p class="bodytext">According to the Ministry of Earth Sciences’ air quality monitor SAFAR, the levels of PM2.5 — tiny particulate matter less than 2.5 microns that can enter deep into the lungs — reached 740 in Delhi University, several hundred times higher than the 0-60 considered "good".</p>.<p class="bodytext">Other areas of the city were no better.</p>.<p class="bodytext">Anand Vihar was the most polluted area in the capital with an AQI of 436 and Nehru Nagar following with an AQI of 430.</p>.<p class="bodytext">Delhi’s air quality took a hit after on Diwali night due to a combination of firecracker emissions, stubble burning and unfavourable meteorological conditions.</p>.<p class="bodytext">Since then, pollution levels have been oscillating between the lower end and the higher end of the “very poor” category.</p>.<p class="bodytext">On Diwali night, a large number of revellers brazenly flouted the Supreme Court-enforced two-hour limit for bursting crackers.</p>.<p class="bodytext">The Supreme Court had also ordered that only green firecrackers, which cause 30 per cent less pollution, can be manufactured and sold, but a DPCC official said a large number of illegal crackers were burst on Diwali.</p>.<p class="bodytext">The Arvind Kejriwal government had organised a mega laser show in an effort to dissuade people from bursting crackers.</p>.<p class="bodytext">SAFAR said an increase in the wind speed will help disperse pollutants and the pollution levels are expected to come down.</p>.<p class="bodytext">However, officials at the Indian Meteorological Department said a significant increase in the wind speed is unlikely over the next two days and similar conditions are expected to prevail.</p>.<p class="bodytext">The AQI takes into account five chief pollutants - particulate matter with a diameter less than 10 micrometres (PM10), PM2.5, ozone (O3), nitrogen dioxide (NO2), and carbon monoxide (CO).</p>.<p class="bodytext">The higher the AQI value, the greater the level of air pollution and the greater the health concern.</p>
<p class="title">The skies over the national capital were a smoky grey on Tuesday as the sun struggled to shine through the haze with the air quality deteriorating and slipping into the "severe" category in several places in the city.</p>.<p class="bodytext">At 12.30 pm, the city’s overall air quality index was 390 -- marginally better than Monday's high of 397 at 8 pm -- according to the Central Pollution Control Board.</p>.<p class="bodytext">Pollution levels in the satellite towns of Ghaziabad (429), Greater Noida (418), and Noida (427) were worse.</p>.<p class="bodytext">An AQI between 0-50 is considered “good”, 51-100 “satisfactory”, 101-200 “moderate”, 201-300 “poor”, 301-400 “very poor”, and 401-500 “severe”. Above 500 is “severe-plus emergency” category.</p>.<p class="bodytext">According to the Ministry of Earth Sciences’ air quality monitor SAFAR, the levels of PM2.5 — tiny particulate matter less than 2.5 microns that can enter deep into the lungs — reached 740 in Delhi University, several hundred times higher than the 0-60 considered "good".</p>.<p class="bodytext">Other areas of the city were no better.</p>.<p class="bodytext">Anand Vihar was the most polluted area in the capital with an AQI of 436 and Nehru Nagar following with an AQI of 430.</p>.<p class="bodytext">Delhi’s air quality took a hit after on Diwali night due to a combination of firecracker emissions, stubble burning and unfavourable meteorological conditions.</p>.<p class="bodytext">Since then, pollution levels have been oscillating between the lower end and the higher end of the “very poor” category.</p>.<p class="bodytext">On Diwali night, a large number of revellers brazenly flouted the Supreme Court-enforced two-hour limit for bursting crackers.</p>.<p class="bodytext">The Supreme Court had also ordered that only green firecrackers, which cause 30 per cent less pollution, can be manufactured and sold, but a DPCC official said a large number of illegal crackers were burst on Diwali.</p>.<p class="bodytext">The Arvind Kejriwal government had organised a mega laser show in an effort to dissuade people from bursting crackers.</p>.<p class="bodytext">SAFAR said an increase in the wind speed will help disperse pollutants and the pollution levels are expected to come down.</p>.<p class="bodytext">However, officials at the Indian Meteorological Department said a significant increase in the wind speed is unlikely over the next two days and similar conditions are expected to prevail.</p>.<p class="bodytext">The AQI takes into account five chief pollutants - particulate matter with a diameter less than 10 micrometres (PM10), PM2.5, ozone (O3), nitrogen dioxide (NO2), and carbon monoxide (CO).</p>.<p class="bodytext">The higher the AQI value, the greater the level of air pollution and the greater the health concern.</p>