Mysterious Fog in the US , Canada and UK: A dense, eerie fog with a "burning chemical-like smell" has spooked a good part of North America and parts of the United Kingdom and Canada. With social media amplifying all concerns, this phenomenon has sparked attention across all social media platforms. However, at the heart of this mysterious fog are a conjunction of natural events, social psychology, and environmental conditions that culminated in all the conspiracy theories and public health fears. Here's a closer look at the mysterious fog, its potential causes, and the societal response it has triggered.

Fog that Feeds Fear

The first reports of this "mysterious fog" came in from Florida where a resident said that they experienced respiratory symptoms, feverish warmth, and stomach cramps after contact with the fog. Similar stories started flooding social media, and within a day or two, a sinister force seemed to sweep across the United States, Canada, and parts of the UK. From Texas to Minnesota, people reported weird odors and health issues that they thought were linked to this bizarre atmospheric event.

Some witnesses were said to see "white particles" swirling through the air; theories ranged from a chemical attack or experimental weapon to drone-related chemical dispersals and references to historical military experiments, such as the infamous 1950s "Operation Sea-Spray."

Fuel to the fire were added when videos and posts, hundreds of thousands in number, began circulating on social media sites like TikTok and X (formerly Twitter) speculating on the origin of the fog. Hashtags like #ToxicFog went trending for days. Hysteria created a self-reinforcing loop in which every post spurred further scrutiny and fear.

Scientific Explanation of the Dense Mysterious Fog

1. What is Fog?

Fog is essentially a low-lying cloud formed when the air temperature cools to its dew point, causing water vapor to condense into tiny droplets or ice crystals. Several types of fog—advection fog, radiation fog, and valley fog—can form depending on conditions such as warm, moist air moving over cooler land or when temperatures plummet rapidly under clear skies.

2. Why the Chemical Smell?

Such chemical-like smell as reported during the occurrence of fog events is sometimes attributed to air pollution. It acts like a sponge, where it absorbs these pollutants, which include sulfur dioxide and nitrogen oxides, among others, that emit from industries. This mixture, therefore, leads to a stench that could be mistaken as unnatural or even toxic.

Also Read: Health Concerns Rise As US, Canada, and UK Come Under The Blanket Of Thick, Dense, Toxic Fog

3. What are the Health Concerns?

High moisture levels from fog can significantly exacerbate symptoms related to respiration, but especially in already predisposed asthmatics and allergy patients. The connection of these symptoms with actual fever, stomach cramps, and puffy eyes is too remote. Experts assume that the irritating effects of entrapped pollutants trapped in fog tend to affect more the eyes and throat rather than the rest of the body affected by some report.

Psychological Effects of Mass Panic Caused by Social Media

Social media amplified a natural weather event into a health epidemic. It made the personal experience of individuals become a cause for fear and speculation, a domino effect.

According to psychologists, this is a concept of selective perception, wherein once people's attention is drawn to environmental anomalies, they begin to notice them. This mirrors earlier panics, such as the Seattle windshield pitting panic of 1954. Then, atomic bomb testing caused fear in many and started to have people looking at their windshields for small marks that they had not seen before. Likewise, postings on the strangeness of the fog probably increased public awareness and suspicion, with people looking to attach unrelated symptoms to the phenomenon.

The fog hysteria shares a commonality with other instances of mass panic, such as the "drone sightings" of recent years or the Cold War-era fears of biological warfare.

Also Read: Mysterious Fog Is Making Americans Sick

These events underscore how fear can cloud judgment, especially when amplified by social media and sensationalist headlines. While historical cases, such as "Operation Sea-Spray," offer concrete evidence of the existence of unethical experiments, the jump from a natural weather condition to theories of chemical attacks exemplifies a more modern trend of connecting unrelated dots, all wonderfully seeded in distrust and anxiety.

Despite the swirling rumors, meteorologists and scientists are in agreement that the mysterious fog is not as alarming as it seems. It is well known that fog traps and amplifies pollutants, especially in urban and industrial regions. Moreover, winter months are the most conducive for fog formation, so its recent prevalence is unsurprising.

On the other hand, environmentalists advise that the fog should wake everyone up to increased levels of pollution. The reported odors and health irritations could be just symptoms of far deeper systemic issues like industrial emissions and lack of control over air quality.

The authorities must be transparent in their communication to combat misinformation and allay public fears. Governments and environmental agencies must provide timely updates on weather phenomena, air quality, and health risks. Initiatives like real-time pollutant tracking and public education campaigns can help demystify natural occurrences while addressing valid environmental concerns.

The mysterious Canada fog is a compelling case study in how environmental events intersect with psychology and societal dynamics. While rooted in natural phenomena, the fog became a vessel for collective fears, amplified by modern technology and historical anxieties.

In this information era where communication occurs at an almost lightning pace, the fog becomes a metaphor that reminds everyone about scientific literacy, environmental responsibility, and an effective balance when considering public concern. Whether perceived as a marvel of nature or as a tale that serves to teach, it left a very powerful mark in people's minds.

After US President Donald Trump’s executive order to split MMR into three shots came out in August, he put forth a proposal recently for some childhood vaccines to be divided into five doses.

Trump recently said his administration plans to push vaccine makers to split some childhood vaccines into five separate shots, believing and claiming that giving smaller amounts at longer intervals could lead to a significant reduction in autism.

Trump made the claims on September 18 but did not specify which vaccines he wants divided into five doses, nor did he provide scientific evidence linking vaccination schedules to autism. He said the doses would be given at six-month intervals.

The proposal follows an executive order Trump signed in August, directing changes to federal childhood vaccine recommendations, including separating the combined measles, mumps and rubella (MMR) vaccine into three individual shots and administering them at separate visits.

What Is Trump’s Proposal?

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On Friday, the President Trump said that his administration is planning to recommend that certain childhood immunizations should be separated into five shots, each with a “small amount of the vaccine.” He added that these doses would each be given six months apart.

“Instead of a child going in and having a tremendous amount of different vaccines pumped into a big proportion of the body … we’re going to recommend that they do five doses marked one, two, three, four, five and that they be given in six-month intervals, so that a small amount of the vaccine gets pumped into the body,” Trump said.

He also said he expects that this could lead to a “massive reduction in autism.” However, it remains unclear which childhood vaccines would be affected or how such a five-dose schedule would be implemented.

HHS Secretary Robert F. Kennedy Jr., who was standing by Trump as he announced the vaccine changes, received a standing ovation Thursday at the conference of the anti-vaccine advocacy group Children’s Health Defense.

He praised Trump’s embrace of vaccine skeptics, stating, “You have a strong and steadfast friend at the White House” and said that he would “stay in this fight.”

Vaccine formulations and dosing schedules are established through clinical research and regulatory review. So, Trump’s proposal to divide an existing dose has sparked reactions.

No Evidence That Vaccines Cause Autism

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Decades of research have not established that childhood vaccines cause autism. The CDC's current vaccine-safety information says multiple studies have found no link between MMR vaccination and autism.

In August, Trump signed an executive order to change the federal government’s approach toward childhood vaccines, insisting that infants should receive fewer immunizations over a longer period.

He advised that the measles-mumps-rubella (MMR) vaccine be separated into three individual shots, despite little to no scientific evidence. Research also proves that there is no published scientific evidence showing a benefit from separating the combined MMR vaccine into three individual shots.

However, the CDC's current website reflects the Trump administration's position, stating it has not definitively ruled out every possible relationship between infant vaccines and autism. It also says that HHS is funding further research into biological mechanisms.

The strongest available evidence for MMR specifically continues to show no association with autism, according to the CDC's cited evidence reviews.

Would Splitting Vaccines Make Them Safer?

There is currently no evidence that splitting combination vaccines into smaller doses prevents autism. The CDC also says there is no published scientific evidence that separating MMR vaccine into individual measles, mumps and rubella vaccines provides a safety benefit.

Experts have also questioned the idea that simply dividing a vaccine dose would change its safety profile.

José Romero, a former senior CDC official, told The Washington Post that vaccines are formulated in a way, so the total dose produces the intended immune response.

Dr. Paul Offit, director of the Vaccine Education Center at the Children’s Hospital of Philadelphia told CNN that Trump’s plan would render vaccines ineffective and wouldn’t make them safer necessarily.

Offit said, “When you create a vaccine, you do a dose response curve, and you’re trying to give the least amount of vaccine that induces an immune response that’s protective. So, you don’t want to give too much, where you know you don’t need all that, and you don’t want to give too little, where it’s you know sub-immunogenic.”

He added, “What he’s suggesting would not work. He’s basically saying he wants to give vaccines in a manner in which they wouldn’t be protective.”

The Democratic Republic of Congo has started vaccinating frontline healthcare workers against Ebola amid the worst-ever outbreak. The vaccination will target 20,000 workers as the death toll has surpassed 3,500.

Vaccinations began on September 19, 2026, in Bunia and Mongbwalu zones in Ituri province, where the outbreak is the most concentrated.

The ongoing vaccination campaign will also cover North Kivu, where transmission has refused to slow down. The vaccine coverage is expected to help thousands of frontline workers over the next six to nine months.

According to the Congolese authorities, as of September 20, the current outbreak caused by Bundibugyo virus has infected around 7,541 people and claimed 3,639 lives. Till now, around 1,823 people have recovered from the infection.

The Bundibugyo virus is a different Ebola species from the Zaire strain, which is targeted by the licensed Ervebo vaccine.

Why Congo Is Using Ervebo Vaccine To Target Bundibugyo Ebola Strain?

The vaccine being administered currently is Ervebo, which is licensed for Ebola caused by the Zaire strain. There is currently no licensed vaccine or proven treatment for Bundibugyo virus.

The World Health Organization has said evidence is still insufficient to know whether Ervebo protects people against Bundibugyo Ebola.

Laboratory and animal data suggested it might offer some protection, but this has not been established in humans.

That is why part of the vaccine allocation is being used as a clinical study. Of the 70,000 Ervebo doses approved for Congo, 50,000 are intended for frontline and health workers, while 20,000 are allocated to research evaluating protection against Bundibugyo virus.

The study launched by Médecins Sans Frontières and Epicentre will follow 20,000 frontline workers in Ituri and North Kivu for nine to 12 months.

Steve Ahuka, a Congolese Ebola responder, said, “We don’t know to what degree it might be effective against the Bundibugyo strain.”

Also read: DRC Says Ebola Outbreak Has Peaked, UN Warns It’s Still Growing

Health Workers Are Being Prioritised

Healthcare workers are at high risk as they face high exposure due to close contact with infected patients.

Ituri's military governor, Maj. Gen. Gaby Kasongo Mulumba, said, “Our collective duty is to protect life. Launching this vaccination drive for front-line staff in Ituri is not an arbitrary choice, as these workers are particularly exposed and deeply involved in the response.”

Dr Jeannot Elua, a health worker in Bunia who received the vaccine, called it “beneficial” but acknowledged the uncertainty surrounding repeat vaccination.

Also read: Ebola Transmission Falls In Some Areas Of Congo, But Outbreak Still Kills: WHO

Ebola Outbreak Showing Signs Of Finally Slowing Down

There are signs of improvement in parts of Ituri, but health authorities and international agencies continue to warn and has not declared that the outbreak is under control.

WHO Director-General Tedros Adhanom Ghebreyesus said on September 16 that there were “encouraging signs that we are gaining ground”, particularly in Ituri, but warned that the outbreak remained a serious threat because of high population movement.

WHO's Maria Van Kerkhove said, “This is far from over.”

The Ebola outbreak has spread across seven provinces and remains particularly difficult to control because of uncertainty, displacement, population movement and challenges in reaching affected communities.

Amid an expanding outbreak, Florida has confirmed its first dengue-related death in the Tampa Bay region. It is the first death due to dengue in Tampa Bay in almost a century, while Florida health officials have confirmed this as the state’s first dengue-related death of 2026.

The latest reports show the newest figures that indicate 152 locally acquired dengue cases as of September 12, with 134 in Hillsborough County.

First Dengue-Related Death In Florida

Florida’s dengue outbreak has turned deadly as with health officials have confirmed the state’s first dengue-related death of 2026.

The Florida Department of Health confirmed the death on September 18. The victim was an 80-year-old Hillsborough County woman who died on September 4. Her death marks the first known dengue-related fatality in the Tampa Bay region in nearly a century.

The latest state data, covering cases through September 12, show 152 locally acquired dengue infections across Florida this year, including 134 in Hillsborough County.

That means nearly 90% of the state's locally acquired cases have been concentrated in the county, which has emerged as the epicentre of the outbreak.

“This is wildly unusual for us,” Chris Wilkerson, a spokesperson for Hillsborough County, said.

Also read: QDENGA: India’s First Approved Dengue Vaccine May Hit Shelves In 2027; How Effective Is It?

Dengue Outbreak In Florida

Dengue is a viral infection transmitted mainly by infected Aedes aegypti and Aedes albopictus mosquitoes. These mosquitoes are established in Florida and can spread the virus after biting an infected person.

Majority of the dengue infections reported in the continental US were linked with international travel. But Florida has increasingly recorded locally acquired infections, meaning people contracted the virus without travelling to a dengue-endemic country.

The state reported its largest number of locally acquired dengue infections in 2023, at nearly 200. With 152 cases already recorded this year, 2026 has become the state's second-highest year for locally acquired infections.

Also read: Delhi Dengue Cases Rise In September: Is Weather Fueling The Surge?

How Can Dengue Become Life-Threatening?

Most people infected with dengue either have no symptoms or develop a relatively short-lived illness with fever, headache, muscle and joint pain, nausea and rash. But a small number of people can develop severe dengue, particularly around the time the fever begins to subside.

Warning signs include severe abdominal pain, persistent vomiting, bleeding or unusual bruising, difficulty breathing, extreme weakness and restlessness.

Severe dengue may also cause plasma leakage, shock, severe bleeding and organ damage, which can become fatal without prompt medical care.

In the Florida woman's case, her death certificate listed dengue infection, septic shock and multi-organ failure as causes, according to the Tampa Bay Times.

Florida Outbreak Is Raising Concern

Hillsborough County normally sees only a handful of dengue cases, making the current cluster seems to be highly unusual. Mosquito-control teams have increased aerial and ground surveillance and spraying, inspecting properties for stagnant water where mosquitoes can breed.

Recent mosquito sampling has not detected dengue virus in some of the latest collections, which officials say could indicate that transmission is beginning to decline. But experts caution that the mosquitoes capable of spreading dengue may still remain in Florida.

Michael von Fricken, an associate professor of environmental and global health at the University of Florida, said the state's recurring mosquito population means dengue may become “somewhat the new normal.”

Florida health officials are urging residents to use mosquito repellent, wearing long sleeves and trousers, and removing stagnant water from around homes.