<p>New Delhi: Delhi's air quality deteriorated on Sunday with the 24-hour average Air Quality Index (AQI) reaching the 'severe' category at 409 at 4 pm, Central Pollution Control Board (CPCB) data showed.</p>.<p>On Saturday, the AQI was recorded at 370, placing it in the 'very poor' category.</p>.<p>An AQI between zero and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.</p>.<p>The capital on Sunday experienced dangerously high levels of PM2.5, the primary pollutant, with 37 out of 39 monitoring stations reporting air quality in the 'severe plus' category.</p>.Delhi air quality in 'severe' zone, minimum temperature 7.5 degree C.<p>Some areas recorded AQI levels as high as 474.</p>.<p>PM2.5 particles, which are 2.5 micrometres or smaller in diameter, can penetrate deep into the lungs, posing significant health risks.</p>.<p>Delhi remains under Stage IV of the Graded Response Action Plan (GRAP), which includes stringent anti-pollution measures such as a complete ban on construction activities and restrictions on non-essential polluting trucks entering the city.</p>.<p>Meanwhile, the weather office has forecast cloudy sky with light rain on Monday, with temperatures expected to range from a high of 20 degrees Celcius to a low of 7 degrees Celcius.</p>
<p>New Delhi: Delhi's air quality deteriorated on Sunday with the 24-hour average Air Quality Index (AQI) reaching the 'severe' category at 409 at 4 pm, Central Pollution Control Board (CPCB) data showed.</p>.<p>On Saturday, the AQI was recorded at 370, placing it in the 'very poor' category.</p>.<p>An AQI between zero and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.</p>.<p>The capital on Sunday experienced dangerously high levels of PM2.5, the primary pollutant, with 37 out of 39 monitoring stations reporting air quality in the 'severe plus' category.</p>.Delhi air quality in 'severe' zone, minimum temperature 7.5 degree C.<p>Some areas recorded AQI levels as high as 474.</p>.<p>PM2.5 particles, which are 2.5 micrometres or smaller in diameter, can penetrate deep into the lungs, posing significant health risks.</p>.<p>Delhi remains under Stage IV of the Graded Response Action Plan (GRAP), which includes stringent anti-pollution measures such as a complete ban on construction activities and restrictions on non-essential polluting trucks entering the city.</p>.<p>Meanwhile, the weather office has forecast cloudy sky with light rain on Monday, with temperatures expected to range from a high of 20 degrees Celcius to a low of 7 degrees Celcius.</p>