Well, regarding the #ToxicFog maybe not worldwide and just in the US -- and maybe just pollution and funky air pressure? (I've experienced that on very cold days -- one can smell woodstove smoke in the outside air because it doesn't rise). However, the US did conduct #Biowarfare experiments on its own citizens back in the 1950s...

Years before 1st Fleet Week, Navy quietly sprayed S.F. with germs

By Marcus White | Examiner staff writer| | Oct 3, 2023

"Seventy-three years ago this month, a San Francisco man checked back into a local hospital after his recent prostate surgery, setting off a chain of events that revealed the existence of a covert U.S. military test conducted in the Bay Area.

"Just three weeks later, 75-year-old Edward Nevin was dead, after bacteria once thought harmless spread to his heart. Doctors found the same bacteria in 10 other patients over the ensuing months, leading the disconcerted doctors to write about the outbreak in a medical journal.

"That bacteria was introduced to the Bay Area decades before The City started celebrating Fleet Week, and its spread was part of a secret U.S. military operation testing the vulnerability of port cities to biological weapons attacks.

"The Navy and Army conducted '#OperationSeaSpray' between Sept. 20 and Sept. 27, 1950, a full 31 years before then-San Francisco Mayor Dianne Feinstein inaugurated Fleet Week as an annual event in The City honoring the country’s armed services at sea.

"It was one of at least 239 tests that covered American cities in bacteria as part of a germ warfare program conducted at the height of the Cold War.

"A Navy ship floating near the Golden Gate Bridge sprayed two bacterial strains — Bacillus globigii and Serratia marcescens — in the air during a series of six Army-sponsored tests. The latter bacteria wasn’t thought to be a human pathogen at the time, but subsequent research has definitively shown that it can cause disease."

Read more:
https://www.sfexaminer.com/news/the-city/years-before-1st-fleet-week-navy-quietly-sprayed-s-f-with-germs/article_56584854-4a8a-11ed-8de0-7f28505ccfe9.html

Years before 1st Fleet Week, Navy quietly sprayed S.F. with germs

The test was one of 239 the U.S. conducted during the height of the Cold War, all without the public's knowledge or consent

San Francisco Examiner