Delhi is ranked sixth on the list and there has been "laziness" on part of its elected caretakers in tackling air pollution in the city, the 'Political Leaders Position and Action on Air Quality in India 2014-2019' report, released by Climate Trends, said.
"The wind speed is unusually faster for this time of the year and improving the air quality rapidly. The AQI is predicted to remain in 'poor' category tomorrow and then to start increasing slowly from January 16 for next two days but to remain in the lower range of very poor," the SAFAR said.
There are no national or international acceptable standards for PM1 concentration in the air, unlike those for PM2.5 and PM10. But studies across the world have indicated a link between the pollutant and cardio-vascular disease.
To purify an entire room properly an air purifier must sense pollution events automatically; capture particles and pollutants such as PM 2.5 and PM10 and harmful gases, and project cleaner air to every corner of the room for even room purification.
The study said particles deposited on or in the vicinity of the road may be re-entrained or resuspended into air through vehicle-induced turbulence, shearing stress of tyres and high windspeed. The common used term for these particles was ‘road dust'.
The tribunal had also rapped the Delhi government and the neighbouring states over their action plan on ways to deal with severe air pollution in the city and directed them to file a detailed document to tackle the problem.