No clear trend on pollution during Odd-Even trial: Pollution Control Board


The Central Pollution Control Board on Sunday said that there was no clear trend to suggest that the odd-even formula for cars in the early part of January had significantly reduced the pollution in the capital.

It said that fluctuations in concentration of pollutants during the odd-even experiment suggested that no single action could substantially reduce air pollution levels in the capital.

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The CPCB’s report on Delhi’s pollution, as reported by the PTI, said, “With no clear trend and wide fluctuations observed in the concentrations, it is evident that the meteorology and emissions from other polluting sources have been major factors impacting air quality of Delhi during the period.”

The report which analysed the air quality before, during and after the odd-even formula also added, “Overall, it can be stated that while some reduction in air pollution is likely to happen due to odd-even scheme, a single factor or action cannot substantially reduce air pollution levels in Delhi.”

The CPCB analysis is based on the data collected by 8 operational Continuous Ambient Air Quality Monitoring Systems (CAAQMSs) including 4 of its own (Shadipur, Dwarka, Dilshad Garden and Parivesh Bhawan) and other 4 belonging to Delhi Pollution Control Committee (DPCC) (Mandir Masg, RK Puram, Punjabi Bagh and Anand Vihar).

The CPCB also collected data from its 7 manual stations (Pitampura, Sirifort, Janakpuri, Nizamuddin, Shahzada Bagh, Shahdara and Bahadur Shah Zafar Marg) which operate on alternate days.

Arvind Kejriwal led government of Delhi had implemented a 15-day trial of odd-even formula for cars to reduce air pollution in Delhi. The campaign which began on 1 January came to an end on 15 January.

There may be ambiguity over the level of impact it had on improving air quality, the commuters widely appreciated the initiative as the experiment made traffic movement considerably better.


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