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. 2020 Jul 13;62:102382. doi: 10.1016/j.scs.2020.102382

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© 2020 The Author(s)

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 3 — Variability of PM_2.5 concentrations (μg m⁻³) during lockdown period (25 March to 11 May 2020) for (a) Chennai, (b) Delhi, (c) Hyderabad, (d) Kolkata, and (e) Mumbai. The plot represents the mean PM_2.5 (diamonds), the median (horizontal bars in the centre of boxes), the 25th and 75th percentiles (the bottom and top edge of the boxes), and minimum and maximum concentration (the bottom and the top edge of the whiskers). The plot also shows extreme observations, which are much larger and lie above the rest of the data as black dots).