A traveler (L) wearing a face mask waits to check in during the COVID-19 outbreak at Pearson International Airport in Toronto, Canada, on April 20, 2020. Canadian Transport Minister Marc Garneau announced on April 17 a new measure to take effect on April 20, requiring all airline passengers to cover their mouths and noses with either a non-medical mask or other face covering at airport screening checkpoints. (Photo by Zou Zheng/Xinhua)

NEW YORK, April 20 -- Global COVID-19 death cases topped 170,000 on Monday evening, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University.