Some urban centres around the world have recorded dramatically lower levels of air pollution since containment measures were introduced to stop the spread of the COVID-19 virus. Photographs showing clear blue skies above Chinese and Indian cities and iconic landmarks usually shrouded in smog and haze suggest a silver lining to this public health crisis. 2SER’s The Daily spoke with Dr Javier Leon – Senior Lecturer in Physical Geography at the University of the Sunshine Coast – about emerging research using satellite imagery to monitor how pollution is changing in major Australian cities.