Delhi’s Odd-Even reduced pollution, but skewed by night traffic and other factors

David RobertsNews0 Comments

NEW DELHI: A study of Delhi’s odd-even trial has suggested that the road rationing scheme did improve air quality during the trial hours — especially during peak traffic hours — but those gains were lost due to heavy car and truck traffic during the non-trial hours between 8pm and 8am.

In addition to emissions from commercial vehicles, increased traffic at night after the odd-even hours may have led to the increase in the 24-hour average particulate matter (PM) values, reveals the study by IIT Delhi in collaboration with University of Surrey, University of Birmingham and others. It also found that the baseline concentrations —those excluding local emission sources such as vehicles estimated by IIT Delhi — at various locations were already high and masking the improvements from the odd-even trial.

The study used data from Delhi Pollution Control Committee (DPCC) to make their assessments for Anand Vihar, Mandir Marg, RK Puram and Punjabi Bagh. Except for RK Puram, all are near heavy traffic zones. It considered hourly averages for the odd-even days in January and April 2016 and the PM data for the same dates in 2015.

Researchers also found that meteorological factors like wind speed and direction played an important role. READ MORE …

Here is a Summary from the University of Surrey

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