Changes

The comparative chart below shows {{w|Google Ngram Viewer}} data for Pollution in Delhiand pollution in Beijing, from 1940 1945 to 2019.<ref>{{cite web |title=Pollution in Delhi and pollution in Beijing |url=https://books.google.com/ngrams/graph?content=Pollution+in+Delhi%2Cpollution+in+Beijing&year_start=1945&year_end=2019&corpus=26&smoothing=3&case_insensitive=true |website=books.google.com |access-date=12 21 April 2021 |language=en}}</ref>

[[File:Pollution in Delhi and pollution in Beijing ngram.png|thumb|center|700px]]