IT WORKED, BUT...

Diwali sees cleaner air than last year but weather conditions leave pollutants trapped

The Central Pollution Control Board (CPCB) blamed the postdiwali weather conditions for the spike in pollution levels.

“There was a definite decline in burning of firecrackers because of the ban. But the high moisture content and calm winds on Friday (the day after Diwali) trapped pollutants, making some parts of Delhi more polluted than others,” said Central Pollution Control Board member-secretary A Sudhakar.

For instance, pollution levels touched hazardous levels – PM10 at 1,179 and PM2.5 at 878 – at RK Puram around 11 pm on Thursday. Nevertheless, the day’s average provided a clearer picture. Anand Vihar, one of the most polluted areas in the city, recorded a PM 2.5 level of 301 microgrammes per cubic

metre. This was the lowest since 2012. However, data provided by the Delhi Pollution Control Committee indicated that the number of micro-fine particles in the RK Puram air touched 440 microgrammes per cubic metre – the highest in eight years.

An analysis conducted by the Centre for Science and Environment stated that the situation could have been worse if the firecracker ban hadn’t been enforced.

\Besides this, the Supreme Court-mandated panel Environment Pollution Control Authority (EPCA) had also enforced a Graded Response Action Plan (GRAP) that banned the use of diesel generators in the national capital and shut down the Badarpur thermal power plant to curb pollution levels.

“Pollution levels fluctuate in accordance with emission levels and weather patterns. To initiate action as per the Graded Response Action Plan, pollution has to remain stagnant at one level for at least 48 hours,” EPCA member Sunita Narain had said when the action plan came into force on Tuesday.

Met officials said the Capital’s air was unlikely to clear up before Sunday, when strong winds are expected to rush in.

On the brighter side, noise pollution levels were at their lowest when compared to the last four years.

On the day of the festival, it seemed as if Delhi would have its cleanest Diwali in three years. However, things took a turn for the worse the next day, when the city’s green belts – such as Lodhi Road and Mathura Road – retained moisture levels to increase the air-pollution load. “PM2.5 levels have been alternating from poor to very poor since October 1.

But the emergency level was breached on Diwali night,” an analysis by the Centre for Science and Environment stated.

Although firecrackers were burst in most parts of the city, the volume was much less due to lack of easy availability.

While some people travelled out of the city to buy the polluting agents, others said they used leftovers from last year’s stash.