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LATEST NEWS UPDATES | Study sounds summer ozone alert -GS Mudur

Study sounds summer ozone alert -GS Mudur

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published Published on Jun 4, 2017   modified Modified on Jun 4, 2017
-The Telegraph

New Delhi: A summer rise in ozone, an air pollutant, over the National Capital Region should stimulate health protection measures and serve as an alert to other Indian cities, the non-government Centre for Science and Environment said today.

The CSE has, using Central Pollution Control Board data, identified spikes in ozone levels persisting longer with the advance of summer. The share of days violating the pollution board's standard of 100 micrograms of ozone per cubic metre increased from 12 per cent in February to 19 per cent in March and 77 per cent in May.

Warm air increases the formation of ozone, a gas produced when oxides of nitrogen emitted by vehicles and other sources are exposed to sunlight.

Independent research by scientists in Germany has indicated that the combined effect of heat waves and trees in cities can increase ground levels of ozone.

Health studies suggest that high levels of ozone can cause breathlessness and coughing, damage the airways, and aggravate lung diseases such as asthma, bronchitis and emphysema.

"Without preventive action, the ozone levels we see over the National Capital Region may become a public health problem," said Anumita Roychowdhury, executive director for research and advocacy at the CSE.

"We've analysed only the capital's ozone levels, but other cities with similar conditions should also be alert about this pollutant."

An analysis of pollution board data suggests that the higher the air temperature from sunshine, the higher the ozone concentration rose.

For instance, while the daytime temperature rose from 32°C on May 3 to 36°C on May 8, the daytime concentration of ozone rose from 100 to 230 micrograms per cubic metre.

The CSE has described these findings as "ominous" because global warming and the projected higher frequency of extreme weather events, including heat waves, are likely to put people at risk of serious health harms from ozone.

In February this year, the State of Global Air 2017 report from the US-based Health Effects Institute had said India topped the world in premature deaths from ozone pollution, accounting for 8.6 ozone-linked deaths per 100,000 population compared with 5.3 deaths in China.

"The preventive actions are well known. They include scaling up public transport, taking measures to reduce vehicles on the roads, and encouraging walking and cycling," Roychowdhury said.

The CSE has urged local authorities to issue health alerts on "bad ozone days".

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The Telegraph, 4 June, 2017, https://www.telegraphindia.com/1170604/jsp/nation/story_155085.jsp


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