1. TOI. Delhi has the worst air pollution in the world: WHO; 2014. The Times of India, 7 May 2014.
2. Chauhan C. Delhi world’s most polluted city: Study, Hindustan Times, 8 May 2014; 2014. https://www.hindustantimes.com/india/delhi-world-s-most-polluted-city-study/story-Kqiz2WDZ8muWya6MJpbGPM.html.
3. NUMBEO. Pollution Index 2018. https://www.numbeo.com/pollution/rankings.jsp.
4. Emission of air pollutants from crop residue burning in India;N Jain;Aerosol and Air Quality Research,2014
5. The Characteristics of Air Pollutants during Two Distinct Episodes of Fireworks Burning in a Valley City of North China;Y Song;PloS one,2017