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This story is from August 30, 2007
CNG switch has reduced city pollution
The city has breathed a lot easier since the last time a section of its traffic changed over to a greener, cleaner fuel.
All 55,000 of Mumbai’s taxis have switched over to CNG since 2000. That has meant they emit 55 tonnes less of carbon monoxide every year.
Besides, the significant drop in carbon monoxide levels, particulate matter in taxi emissions has come down by 99 per cent from pre-CNG levels (a decrease of 29 tonnes).
"We can say air quality has improved in proportion to the improvement in fuel quality as most vehicles are compliant with Euro-II and Euro-III standards," Rakesh Kumar of the National Environment Engineering Research Institute (NEERI), Mumbai, said. The improvement would be similar in auto-rickshaw emissions as well, he said. An overwhelming of Mumbai’s auto-rickshaws now run on CNG.
Comparison of sulphur dioxide levels reinforce the theory. There used to be 46 micrograms per cubic metre of sulphur dioxide in Kalbadevi in 1990. The figure came down to 13 in 2000 when the switch from to CNG happened. The 2005 figure was 9.
But BEST buses have been comparatively slower in the switch-over; less than 20 per cent of the fleet runs on CNG. The improvement in air quality could also be short-term. Kumar said an uncontrolled growth of vehicular population could deteriorate air quality again: "Average speeds may come down to 8 kph from the present 20 kmph-25 kmph in the city, meaning more burning of fuel and more emissions."
archana.sharma@timesgroup.com
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