Air cleaner this April than last year, says body studying odd-even
Air quality in New Delhi is slightly better in the second half of April this year as compared to the last.Breathe delhi Updated: Apr 28, 2016 12:01 IST
Air quality in New Delhi is slightly better in the second half of April this year as compared to the last.
According to the data provided by System of Air Quality and Weather Forecasting and Research (SAFAR), the period between April 15 and 26 has been slightly cleaner this year. The body is analysing the impact of Odd-Even restriction on Delhi’s air. However, during the same period last year, odd-even was not in force.
While the average PM 2.5 concentration over the 12 days last year was 126.4 micro grams per cubic metres. This year, this concentration is 98.5 micro grams per cubic metres.
The acceptable limit of PM 2.5 concentration is 60 micro grams per cubic metres. It is 25 as per WHO standards.
The pollution peaks have also been lower as compared to last year. While last year the most polluted day during the time frame saw PM 2.5 levels touch 160 micro grams per cubic metres, this time the peak is 133 micro grams per cubic metres.
SAFAR has been collating data during the odd-even period and comparing it with the data last year. The data is an average of values from 8 monitoring stations.
The first 14 days of April this year, however, were less polluted and the average PM 2.5 concentration was 78.5 micro grams per cubic metres. Experts say wind speed played a major role in ensuring less pollution.
Readings for ozone, however, are not as encouraging.
The concentration of the har mful pollutant, a by-product of vehicular emissions and their interaction with the atmosphere, has been increasing over the past one week.
In the first three days of Odd-Even, the concentration dropped but picked up soon after. It was the highest for the month so far on Tuesday at 79 parts per billion. The acceptable limit of Ozone is 50 parts per billion.