You're bringing in quality of life issues, which it's true are very different between the developing and developed countries today, and not accounted for in PPP.
But that being said, it's a huge exaggeration to say 1 billion are living in extreme poverty in India, much as it would be inaccurate to say that the 30% of the Indian population categorized as the middle class has the same quality of life standards as their analogues in the developed world.
During the time of the greatest industrial development in the US, working class people had to cope with very extreme environmental hazards that diminished their quality of life, i.e. in Gary, Indiana:
But that being said, it's a huge exaggeration to say 1 billion are living in extreme poverty in India, much as it would be inaccurate to say that the 30% of the Indian population categorized as the middle class has the same quality of life standards as their analogues in the developed world.
During the time of the greatest industrial development in the US, working class people had to cope with very extreme environmental hazards that diminished their quality of life, i.e. in Gary, Indiana:
http://www.encyclopedia.chicagohistory.org/pages/638.html https://www.amazon.com/Environmental-Inequalities-Industrial...