remote sensing Article A Satellite-Based High-Resolution (1-km) Ambient PM2.5 Database for India over Two Decades (2000–2019): Applications for Air Quality Management Sagnik Dey 1,2,* , Bhavesh Purohit 1, Palak Balyan 1, Kuldeep Dixit 1 , Kunal Bali 1, Alok Kumar 1, Fahad Imam 1, Sourangsu Chowdhury 3, Dilip Ganguly 1 , Prashant Gargava 4 and V. K. Shukla 4 1 Centre for Atmospheric Sciences, IIT Delhi, New Delhi 110000, India;
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[email protected]; Tel.: +91-11-2659-1315 Received: 17 August 2020; Accepted: 9 October 2020; Published: 26 November 2020 Abstract: Fine particulate matter (PM2.5) is a major criteria pollutant affecting the environment, health and climate. In India where ground-based measurements of PM2.5 is scarce, it is important to have a long-term database at a high spatial resolution for an efficient air quality management plan. Here we develop and present a high-resolution (1-km) ambient PM2.5 database spanning two decades (2000–2019) for India.