1. Photos show impact of temporary air pollution drops across the world from coronavirus lockdown  CNBC
  2. Earth Day 2020: Startling photos show pollution before and after the coronavirus lockdown  New York Post
  3. Air Pollution Has Fallen Significantly in Nine Major Global Cities, Report Finds  Newsweek
  4. Earth Day 2020: 50th event reminds us how far we have to go  Los Angeles Times
  5. Washington has its cleanest spring air in 25 years: How air quality has improved during the coronavirus crisis  Washington Post
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