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.

At least six Americans who are in the Democratic Republic of the Congo are believed to have been exposed to the Ebola virus, amid the latest outbreak in the African nation that has killed over 80 people and infected nearly 300, according to a media report.

Citing sources, STAT News said that one of the individuals may also have developed symptoms.

Although there are no test results yet for any of the individuals, the US government is reportedly trying to arrange for their transportation out of the DRC to a location where they can be safely quarantined and cared for, if they are found to have been infected.

It is also not clear if that would be in the US. As per sources, it may be an American military base in Germany, the report said.

Meanwhile, the US CDC, in a statement said, it is supporting interagency partners "who are actively coordinating the safe withdrawal of a small number of Americans who are directly affected by this outbreak."

"At this time, the risk to the American public remains low," the CDC said. "CDC continues to closely monitor the situation and has systems in place to detect and respond rapidly to potential public health threats."

The health agency has also issued travel advisories for Americans traveling in Congo and Uganda, telling them to "practice enhanced precautions" and avoid people who have symptoms, which include fever, muscle pain, and rash.

The latest Ebola outbreak, the 17th in DR Congo, has also spread to Uganda. On May 17, the World Health Organization declared it a "public health emergency of international concern."

According to the Africa CDC, the outbreak is caused by a rare strain Bundibugyo virus, for which there is no vaccine available currently.

Also read: WHO Calls Ebola Outbreak In DR Congo And Uganda An International Public Health Emergency

What Is Ebola?

The US CDC explains that the Ebola disease is caused by a group of viruses, known as orthoebolaviruses (formerly ebolavirus).

These viruses can cause serious illness that, without treatment, can cause death. Orthoebolaviruses were discovered in 1976 in the Democratic Republic of the Congo and are found primarily in sub-Saharan Africa.

The four types of orthoebolaviruses cause illness in people are:

• The Ebola virus (species Orthoebolavirus zairense)
• Sudan virus (species Orthoebolavirus sudanense)
• Taï Forest virus (species Orthoebolavirus taiense)
• Bundibugyo virus (species Orthoebolavirus bundibugyoense)

The CDC notes that two other types of orthoebolaviruses have not affected people to date. They are:

• Reston virus (species Orthoebolavirus restonense) has caused disease in non-human primates like macaques.
• Bombali virus (species Orthoebolavirus bombaliense) was more recently identified in bats.

Read More: More Americans Exposed To Hantavirus; 41 Under Monitoring, Says CDC

How Ebola Infection Spreads and Turns Deadly

People sick with Ebola disease can spread the virus to others when they start having symptoms like fever, aches, pains, and fatigue. It can be spread through direct contact with infected bodily fluids.

As the person becomes sicker, the illness causes diarrhea, vomiting, and unexplained bleeding. In severe cases, the virus can damage blood vessels, weaken the immune system, and lead to organ failure, internal bleeding, and shock.

However, the virus can persist in certain bodily fluids, such as semen, even after recovery, meaning transmission may still be possible in rare cases despite the absence of symptoms.

"This happens when the virus remains in certain parts of the body that are shielded from the immune system. For example, the virus can remain in semen even after someone recovers. Whether the virus is present in these body parts, and for how long, varies by survivor," the CDC said.

The World Health Organization today declared the Ebola outbreak in the Democratic Republic of the Congo and Uganda a “public health emergency of international concern” (PHEIC), citing the risk of spread to neighboring countries.

The WHO defines a Public Health Emergency as an extraordinary event or crisis that poses a substantial risk of widespread illness, injury, or death to a population, such as pandemics, severe pollution events, or natural disasters.

However, the WHO clarified that the outbreak, caused by the Bundibugyo virus, does not meet the criteria for a pandemic emergency. Countries sharing land borders with the DRC were described as being at high risk for further spread.

“The Ebola disease caused by Bundibugyo virus in the Democratic Republic of the Congo and Uganda constitutes a public health emergency of international concern (PHEIC), but does not meet the criteria of pandemic emergency, as defined in the International Health Regulations (2005) (IHR),” the WHO said in a statement.

Ebola Outbreak: Cases And Deaths

The UN health agency said the outbreak has caused 80 deaths, with eight laboratory-confirmed cases and 246 suspected Ebola cases reported in Ituri Province in the DR Congo, across Bunia, Rwampara, and Mongbwalu.

In addition, two laboratory-confirmed cases — including one death — with no apparent link to each other were reported in Kampala, Uganda, within 24 hours of each other, indicating international spread. Both individuals had travelled separately from the DR Congo.

A laboratory-confirmed case has also been reported in Kinshasa, DR Congo, involving a person returning from Ituri.

The WHO further noted unusual clusters of community deaths and said the outbreak poses a public health risk to other countries through international spread, which has already been documented.

Also read: World Hypertension Day 2026: Why Switching Salt May Be India’s Simplest Weapon Against High Blood Pressure

What Is Bundibugyo Virus Disease?

Bundibugyo virus disease is a rare and deadly illness that has caused outbreaks in several African countries in the past. It is different from other known ebolaviruses such as the Zaire ebolavirus and Sudan ebolavirus.

The virus was first identified during an outbreak in 2007, which resulted in more than 100 cases before being declared over in early 2008.

The WHO described the current outbreak as “extraordinary” because there are no approved Bundibugyo virus-specific therapeutics or vaccines, unlike the Ebola-Zaire strain. Most of the country’s previous outbreaks were caused by the Zaire strain.

How The Virus Spreads

According to US Centers for Disease Control and Prevention (CDC), the Bundibugyo strain spreads through contact with the blood or body fluids of infected individuals or people who have died from the disease.

Transmission can also occur through contact with contaminated objects such as clothing, bedding, needles, and medical equipment, or through infected animals including bats and nonhuman primates.

Symptoms include fever, headache, muscle pain, weakness, diarrhea, vomiting, stomach pain, and unexplained bleeding or bruising in the later stages of illness.

Read More: Can Hantavirus Spread Through Semen And Breast Milk? What Experts Say

WHO Issues Guidelines

The WHO advised immediate isolation of confirmed cases and daily monitoring of contacts. It also recommended restricting national travel for exposed individuals and avoiding international travel until 21 days after exposure.

At the same time, the agency urged countries not to close borders or restrict travel and trade out of fear, warning that such measures could lead to unmonitored informal border crossings.

Health officials at the Africa Centres for Disease Control and Prevention (Africa CDC) today confirmed that the current Ebola outbreak in the Democratic Republic of the Congo and Uganda is being caused by the rare Bundibugyo strain.

Bundibugyo ebolavirus was first isolated during an outbreak of hemorrhagic fever in Uganda in 2007. There are no vaccines or specific treatments approved to prevent or treat the Bundibugyo strain.

Preliminary laboratory results from the Institut National de Recherche Biomedicale (INRB) detected Ebola virus in 13 of 20 samples tested with the Bundibugyo Virus.

"Africa CDC is actively collaborating with health authorities in DRC, Uganda, and regional partners to deliver a coordinated response to confirmed Ebola Virus Disease cases linked to the Bundibugyo strain," the Africa CDC said in a statement.

"Rapid laboratory testing, contact tracing, cross-border surveillance, and enhanced infection prevention measures are already deployed to protect communities and stop the spread," it added.

Ebola Outbreak: Cases And Deaths

As of the latest update from DRC, approximately 246 suspected cases and 65 deaths have been reported, mainly in Mongwalu and Rwampara health zones.

Four deaths have been reported among laboratory-confirmed cases.

Suspected cases have also been reported in Bunia and are pending confirmation. These figures remain provisional and are being validated through laboratory confirmation, line-list harmonization, contact identification, and epidemiological investigation.

Also read: Ebola Resurfaces In Eastern DR Congo In 17th Outbreak, Claims 65 Lives: All You Need To Know

Ebola Bundibugyo Virus Kills Ugandan Man

Uganda’s Ministry of Health, in a statement, reported a confirmed Ebola Bundibugyo Virus Disease case in a 59-year-old Congolese male who was admitted to Kibuli Muslim Hospital on May 11 and died on May 14.

The country's officials reported the case as imported from DRC and have indicated that no local case has yet been confirmed.

Africa CDC noted that it remains concerned by the urban context of Bunia and Rwampara, with intense population movement, insecurity, mining-related mobility in Mongwalu, gaps in contact listing, infection prevention and control challenges, and the proximity of affected areas to Uganda and South Sudan.

What Is Bundibugyo Virus Disease?

Bundibugyo virus disease is a rare and deadly illness that has caused outbreaks in several African countries in the past.

It is also spread by contact with contaminated objects (such as clothing, bedding, needles, and medical equipment), or by contact with animals, such as bats and nonhuman primates, that are infected with BVD.

Symptoms include fever, headache, muscle pain, weakness, diarrhea, vomiting, stomach pain, and unexplained bleeding or bruising (a late stage of illness).

Read More: National Dengue Day 2026: India Reports 6,927 Cases And 10 Deaths In 2026

Ebola Outbreak: Here's How To Prevent

The US CDC advised people to avoid:

• contact with people who have symptoms such as fever, muscle pain, and rash
• contact with blood and other body fluids or objects that are contaminated with them
• visiting healthcare facilities in the affected areas for nonurgent medical care or for non-medical reasons. Avoid visiting traditional healers in the affected areas
• contact with dead bodies or items that have been in contact with dead bodies
• participating in funeral or burial practices that involve touching the body of someone who has died
• contact with bats, forest antelopes, nonhuman primates (e.g., monkeys, chimpanzees, gorillas), and blood, fluids, or raw meat from these or unknown animals.
• going into areas where bats live, such as mines or caves.

In case of infection, the CDC advises:

• Monitoring for symptoms of BVD while in the outbreak area and for 21 days after leaving.
• If you develop fever, headache, muscle pain, weakness, diarrhea, vomiting, stomach pain, and unexplained bleeding or bruising (a late stage of illness)
• Isolate immediately
• Do not travel.
• Contact local health authorities