PUNE: The amount of black carbon or soot, a potential cancer-causing substance, has been gradually increasing over Pune city since 2005, shows a study conducted by the Indian Institute of Tropical Meteorology (IITM).

Soot is a human carcinogenic which is considered second only to carbon dioxide in causing climate change or global warming.

The research is still in its nascent stage, which means that scientists have still not been able to fix a maximum permissible limit for the substance. But scientists at the city-based IITM say that Pune’s annual average soot concentration of 3.85 micro-gram per cubic meter (ug/m3) – caused by an increasing load of polluting vehicles, among others – is harmful enough, and much worse than that in the western countries.

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