AIR POLLUTION: ‘Grave spikes’ in NOx, Ozone levels; First use of DSI tech to curb SO2

Deadly NOx emissions rising, escape air purifiers

CSE study says the number of cities where Nitrogen Oxides (NOx) exceeded norms increased from 18% to 29% in 10 years. NOx hotspots: Amritsar, Aurangabad, Delhi, Faridabad, Jaipur, Kolkata, Meerut, Navi Mumbai, Pimpri-Chinchwad, Pune, Thane and Vijayawada.

One of the largest NOx increases was in Jamnagar, the site of world’s largest petrochemical complex. NOx cannot be filtered by air purifiers, main sources are vehicles and thermal power plants.

India’s First: Thermal power plant to use DSI tech to curb SO2 emission

State-owned NTPC’s Dadri power plant became the first in the country to decide to adopt DSI technology to lower SO2 emission in cost-effective manner. Dry Sorbent Injection (DSI) system curbs SO2 emissions. Ensuring compliance, Dadri power station had invited bids in March 2018 to install DSI technology.

Grave trend: Ozone spikes-up in Delhi, NCR

Spike in ozone levels was recorded in Delhi and the National Capital Region this summer. During February-May, ozone emerged as the major pollutant along with PM2.5, PM10. Gurugram faced highest number of excess ozone days during April and May.

‘Mumbai’s citizens’ brought down its air pollution

SAFAR study says PM2.5 levels in Mumbai dropped to 60 µg/m3 in 2017, from over 70 µg/m3 in 2016, thanks to people’s awareness and media initiatives, while Maharashtra Pollution Control Board (MPCB) credited the shutting down of 1,000 polluting units. Mumbai ranked the fourth most polluted mega city in the world based on WHO 2016 PM2.5 data.

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