Mercury levels in Delhi’s air highest among 3 Indian cities studied, human activities blamed | India News

PUNE: That Delhi is respiratory poison has been confirmed by yet one more examine, which has revealed that the nationwide capital’s air has the highest focus of mercury – a poisonous metallic linked to neurological, kidney and coronary heart issues – among three Indian cities measured.A six-year examine by Pune-based Indian Institute of Tropical Meteorology (IITM) has discovered that mercury levels in the air in Delhi, Ahmedabad and Pune are properly above the pure background, with coal, site visitors and industries recognized as main contributors. There was a silver lining although – there have been indications of a major decline in mercury levels in Delhi throughout the interval studied, in contrast with earlier years.The international or pure background worth of mercury in clear air is about 1.7 ng/m³ in the Northern Hemisphere and 1.3 ng/m³ in the Southern Hemisphere.The first-of-its-kind examine – revealed lately in the journal Air Quality, Atmosphere & Health, by Springer – analysed information from 2018 to 2024 on gaseous elemental mercury, a key atmospheric pollutant. Researchers reported that Delhi’s air contained, on a median, 6.9±4.2 nanograms of mercury per cubic metre (ng/m³), in comparison with 2.1±0.7 ng/m³ in Ahmedabad and 1.5 ±0.4 ng/m³ in Pune.This means every cubic metre of air in Delhi – roughly the quantity an individual breathes in an hour at relaxation – carries round 7 billionths of a gram of mercury on a median, in comparison with about 2 billionths in Ahmedabad and 1.5 billionths in Pune. Delhi’s peak values have been almost 13 instances larger than the worldwide background degree. The analysis workforce attributed 72%-92% of mercury in these cities to human activities. “Seasonal and nighttime spikes were especially prominent in Delhi and Ahmedabad during winter, linked to coal use, stubble burning, and stable atmospheric conditions,” a scientist from IITM stated.“Mercury is among the top 10 chemicals of major public health concern, according to WHO. Even in small amounts, if exposure continues for 5-10 years, it can be dangerous. Long-term inhalation mainly affects the nervous system, digestive system, immune system, kidneys and lungs,” stated Gufran Beig, chair professor at National Institute of Advanced Studies, IISc. The examine additionally stated Delhi’s mercury levels remained among the highest in south Asia.