Delhi – the WHO’s dirtiest city in the world

Vehicle fuel emission is one of the principal contributors to such high levels of air pollution in Delhi that it headed the WHO’s list of polluting cities last year, with 13 other Indian cities in the top 20. According to the survey, levels of PM2.5 particulates in Delhi were more than six times the WHO’s recommended maximum. 

Indian environment minister Pravash Javadekar highlighted four factors contributing to Delhi’s particular problem, including the significant rise in traffic (from 1.6m vehicles in 1991 to some 8m today).

A move to convert the city’s 8000 buses to natural gas some 15 years ago had a positive but limited impact. We believe that extending this to the100,000 trucks that pass daily through the city, using waste-derived liquefied biomethane fuel would have an additional and meaningful impact on the city’s air quality. It is also a commercially viable solution that would not require the government to introduce any measure that might interfere with its drive to eliminate poverty.

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