Be that as it may, the 10 year-old study is a landmark – it is the most extensive and thorough study ever carried out on the correlation of Delhi’s air-pollution with the health of its children. The only other major study of this nature one can think of – and one which is truly recent – is the 2015 study conducted by the HEAL Foundation, a non-government organisation. The researchers surveyed 2,000 schoolchildren nationwide, and their extrapolated conclusions: Nearly half of Delhi’s children suffer severe lung problems due to air pollution, were splashed across all newspapers and news channels on May 5, 2015. “Around 35 per cent of school-going children in India suffer from poor lung health with Delhi topping the chart,” said NDTV .