Red flag warnings are in effect until Thursday for parts of Los Angeles, Ventura, San Diego, due to low humidity and an uptick in Santa Ana winds.

California Governor Gavin Newsom has deployed fire engines, water-dropping aircraft and hand crews across the region—to enable a rapid response if a new fire does break out, according to The Associated Press.

Just a few years after the ozone hole was detected via satellite, the industrialized nations of the world, meeting in Montreal in 1987, adopted what is known as the Montreal Protocol.