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Ambient air pollution shortens an average Indian's life by over 1.5 years, say scientists who suggest that better air quality could lead to a significant extension of human lifespan around the world. Researchers said that if PM2.5 concentrations worldwide were limited to the World Health Organization's (WHO) air quality guideline concentration of 10 microgrammes per square cubic metre, the global life expectancy would be on average 0.59 year longer. The benefit of reaching the stringent target would be especially large in countries with the highest current levels of pollution, with approximately 0.8–1.4 years of additional survival in countries such as India, Pakistan, Bangladesh and China.