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Odd-even scheme: On Day 1, Delhi’s air quality fluctuates

NEW DELHI: Pollutants in the city’s air dipped by around 10 per cent on average between 8am to 2pm today compared to the last two days, “possibly” due to the odd-even restrictions, before rising sharply afterwards with a fall in day time temperature.

As per initial observations of System of Air Quality and Weather Forecasting and Research (SAFAR), the gains of less vehicular emissions could have been more had there been less vehicular movement and no bursting of firecrackers on the night of January 31.

Although the average value of suspended particulate matter PM 2.5 rose to around 198 micrograms per cubic metre, an increase as compared to Thursday, a fall could be observed between 8am when the odd-even scheme kicked in and 2pm, SAFAR’s Project Director Gufran Beig said.

“Air quality remained very poor. But the reduction in PM 2.5, possibly around 15 per cent due to less emissions and vehicular dust reduction, that was observed for few hours could be seen as an impact of the odd-even measure as other factors like wind speed and temperature remained the same as last two days,” Beig said.

However, the jump that was seen afterward need to be examined scientifically and it was possibly due to a sudden dip in the day time temperature. Cooler temperature heightens pollution.

“It is still premature to conclude anything with just 10 hours available for comparison,” he said in a statement.

(SAFAR) had on Thursday said that air quality in Delhi was expected to deteriorate over the next few days with a possible rise in the level of particulate matter due to fall in minimum temperature and calm wind movement.

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