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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2020 ; 10 (1): 13442 Nephropedia Template TP
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PM(2 5) diminution and haze events over Delhi during the COVID-19 lockdown period: an interplay between the baseline pollution and meteorology #MMPMID32778673
Dhaka SK; Chetna; Kumar V; Panwar V; Dimri AP; Singh N; Patra PK; Matsumi Y; Takigawa M; Nakayama T; Yamaji K; Kajino M; Misra P; Hayashida S
Sci Rep 2020[Aug]; 10 (1): 13442 PMID32778673show ga
Delhi, a tropical Indian megacity, experiences one of the most severe air pollution in the world, linked with diverse anthropogenic and biomass burning emissions. First phase of COVID-19 lockdown in India, implemented during 25 March to 14 April 2020 resulted in a dramatic near-zeroing of various activities (e.g. traffic, industries, constructions), except the "essential services". Here, we analysed variations in the fine particulate matter (PM(2.5)) over the Delhi-National Capital Region. Measurements revealed large reductions (by 40-70%) in PM(2.5) during the first week of lockdown (25-31 March 2020) as compared to the pre-lockdown conditions. However, O(3) pollution remained high during the lockdown due to non-linear chemistry and dynamics under low aerosol loading. Notably, events of enhanced PM(2.5) levels (300-400 microg m(-3)) were observed during night and early morning hours in the first week of April after air temperatures fell close to the dew-point (~ 15-17 degrees C). A haze formation mechanism is suggested through uplifting of fine particles, which is reinforced by condensation of moisture following the sunrise. The study highlights a highly complex interplay between the baseline pollution and meteorology leading to counter intuitive enhancements in pollution, besides an overall improvement in air quality during the COVID-19 lockdown in this part of the world.