According to the 2009 National Ambient Air Quality Standards still in force, the acceptable PM2.5 exposure limit over 24 hours is 60µg/m³

New Delhi

The World Health Organization’s (WHO’s) air quality guidelines are globally recommended standards to help countries achieve air quality and serve only as a guide document, but countries determine their standards based on a variety of localised factors, the Union environment ministry informed the Rajya Sabha.

“However, countries prepare their air quality standards based on geography, environmental factors, background levels, socio-economic status and national circumstances,” Kirti Vardhan Singh, minister of state for environment, said.

He was responding to a three-part question raised by CPI(M) MP V Sivadasan. The first part sought informati

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