id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-199268-fue7ri4h	Schafer, Benjamin	Covid-19 impact on air quality in megacities	2020-07-01		.txt	text/plain	4978	294	56	In London, despite smaller average concentrations, we still observe high-pollutant states and an increased tendency towards extreme events (a higher kurtosis during lockdown). In contrast to previous studies on air pollution during Covid-19 lockdown, such as [15] [16] [17] , we investigate the detailed probability distributions of different pollutants, analysing various locations within the cities. Before moving on to probability distributions and moments,we have to point out that Delhi has a much higher concentration of P M 10 due to its sub-tropical climate and the high frequency of dust storms [13, 21, 22] but also the decrease due to the lockdown is much more impressive than in the overall less-polluted London. The picture for Delhi is quite different: Without a lockdown, the pollutant concentrations are regularly 3 to 5 times as high as in London, indicating a much worse air quality in general.	./cache/cord-199268-fue7ri4h.txt	./txt/cord-199268-fue7ri4h.txt