The dense smog which had been throttling Delhi for the past few days has lifted partially today, but it may come back with renewed vigour, as the factors causing it remain in force - warns Centre for Science and Environment (CSE).

The dense smog which had been throttling Delhi for the past few days has lifted partially today, but it may come back with renewed vigour, as the factors causing it remain in force – says Centre for Science and Environment (CSE). CSE has reviewed the magnitude and severity of the smog. Its researchers believe that while every winter, the calm and cool weather leads to a heavier pollution load on Delhi, this year, the capital is seeing a massive growth in actual pollution levels. The levels of respirable particulate matter (PM10) have surged 47 per cent -- from 191 microgramme per cubic metre in 2000 to 281 microgramme per cubic metre in 2011. In the same period, nitrogen dioxide levels have increased from 41.8 microgramme per cubic metre to 66 microgramme per cubic metre (a 57 per cent jump).

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