Indoor PM 2.5 and PM 10 levels in Gurgaon tonight are at 360 and 425 micrograms per cubic meter, respectively. See how these translate to AQI figures (the pollution figures that newspapers report) here: http://aqicn.org/calculator

The attached graphs shows how an off-the-shelf purified can clean up this air in a matter of one hour. Detailed information on this (still running) experiment is here: https://docs.google.com/spreadsheets/d/1FkrLQ_Ma8v3T39tOmTS96ub7AGFbzFDhggde0hEpilo/pubhtml

Any way you look at it, this data is scary!