Abstract: The COVID-19 pandemic has led to the complete lockdown of many cities worldwide. Lockdowns have significantly changed human behaviour, such as fewer or no industrial activities and limited road and air transport, affecting the environment. In this study, we aimed to assess the variability and trends of PM2.5 (mass concentration of airborne particulate matter < 2.5µm) and carbon monoxide (CO) before and during the COVID-19 lockdown period in Sri Lanka. Data were collected in “Urban Background”, “Public & Mixed Residential”, and “Prima...
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Topics: 
Meteorology
Toxicology