PM2.5 in Kolkata air 9.4 times new WHO limit
The challenge to meet permissible air quality standards in Kolkata got tougher on Wednesday with World Health Organisation (WHO) making the guidelines more stringent, claiming it had evidence that air pollution damaged human health at lower concentrations than previously understood. The last guideline was set in 2005.
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The challenge to meet permissible air quality standards in Kolkata got tougher on Wednesday with World Health Organisation (WHO) making the guidelines more stringent, claiming it had evidence that air pollution damaged human health at lower concentrations than previously understood. The last guideline was set in 2005. 
