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.

A deadly case of hantavirus has been confirmed in Israel, while health authorities in the UK and Spain are investigating suspected infections in three individuals, raising fresh concerns over the spread of the rare rat-borne disease.

Hantavirus is primarily transmitted through contact with infected rodents or exposure to their urine, droppings, and saliva, though rare cases of person-to-person transmission have also been reported.

According to the World Health Organization (WHO), eight cases — including three deaths — have been confirmed so far. However, additional suspected and confirmed cases are continuing to emerge across countries.

Despite growing concern, the WHO, the US Centers for Disease Control and Prevention (CDC), and other health agencies have stated that the overall public health risk remains low.

Here’s a look at the countries reporting confirmed and suspected hantavirus cases.

Israel

The case in Israel, reported by the local newspaper Maariv, is believed to have been infected during a stay in Eastern Europe several months ago. It is reportedly not linked to the ongoing outbreak linked to the MV Hondius cruise ship in the Atlantic Ocean.

The patient underwent an antibody test after the symptoms appeared, which showed exposure to hantavirus, the report said. A PCR (polymerase chain reaction) test was then conducted to detect the virus’s genetic material, confirming the infection, it added.

The patient was said to be in stable condition, not in need of intensive care or strict isolation, and was being kept under medical observation.

Details about the patient and the medical center where the diagnosis was made could not yet be published, but have been reported to the country's Health Ministry.

UK

The UK Health Security Agency had confirmed two British cases connected to the outbreak on board the MV Hondius.

One remains in a stable condition in the Netherlands after being evacuated from the ship, the other remains in intensive care after being flown to South Africa last month.

A third case is also being suspected on the remote South Atlantic island of Tristan da Cunha, where the ship stopped in mid-April, the UK HSA said.

In addition, the agency said that two British nationals are self-isolating at home after potential exposure to hantavirus on the cruise ship. The pair had disembarked earlier in the voyage and currently shows no symptoms.

They were part of a group of 30 people from a dozen nations - including seven Britons - who disembarked from the ship at St Helena in the south Atlantic on 24 April, according to operator Oceanwide Expeditions. Four Britons who disembarked on St Helena remain there, BBC reported.

They do not have symptoms but are in contact with health officials. It is understood that medical staff will be sent to the islands to provide support.

Also read: Donald Trump Says Hantavirus Is 'Under Control'; Questions Grow Over CDC Research Cuts

Spain

A 32-year-old woman who shared an airplane with a MV Hondius cruise ship passenger who later died of hantavirus is now showing symptoms consistent with the disease, Secretary of State for Health Javier Padilla said while speaking to the media.

The woman ⁠has been taken to a hospital in Alicante, where she ⁠remains in isolation, he added. Her symptoms included coughing and "general malaise".

She is being transferred to a hospital in the city of Alicante where she will be tested ‌for ⁠the virus, with results expected 24 to 48 hours later, according to a statement on the regional health department's website.

Padilla said the woman, a resident of Alicante in the Valencia region, ⁠was sitting two rows behind the cruise ship passenger, but the contact between them "was brief" since the passenger had only been "on ⁠board for a short time" during the flight.

Netherlands

The World Health Organization confirmed that a KLM flight attendant, who was isolating in an Amsterdam hospital with mild symptoms after being in brief contact with a hantavirus patient, has tested negative for the virus.

Her case supports the WHO experts’ theory that the rat-borne disease can only be transmitted person-to-person through prolonged, close contact.

Singapore

Two Singaporean residents who were onboard the MV Hondius cruise ship have tested negative for the virus, the Communicable Diseases Agency (CDA) said today.

The 67-year-old and a 65-year-old had been tested and isolated in the city state. The CDA's National Public Health Laboratory conducted testing on multiple samples collected from the individuals and confirmed that hantavirus, including the Andes virus, was not detected, it said.

“The risk to the general public in Singapore is currently low,” the CDA said.

Hantavirus: The Common Symptoms And How To Reduce Your Risk

According to the CDC, symptoms can appear one to eight weeks after exposure, initially presenting fatigue, fever, and muscle aches. As the disease progresses, it can cause coughing, shortness of breath, and chest tightness as fluid accumulates in the lungs.

The CDC reports that about one-third of individuals who develop respiratory symptoms from the disease may not survive.

You can reduce your risk by eliminating and minimizing your contact with rodents in your home, workplace, or campsite. The best way is to seal holes and gaps in your home or garage and keep the rodents from entering your home. You can also place traps in and around your home to decrease rodent infestation. Clean up any easy-to-get food that could attract rodents.

A deadly case of hantavirus has been confirmed in Israel, while health authorities in the UK and Spain are investigating suspected infections in three individuals, raising fresh concerns over the spread of the rare rat-borne disease.

The case reported from is unlikely to be linked with the ongoing outbreak linked to the MV Hondius cruise ship, currently sailing to the Canary lslands.

The UK is suspecting its third case from a remote South Atlantic island of Tristan da Cunha. Spain is suspecting its first case in a 32-year-old woman who shared an airplane with a MV Hondius cruise ship passenger who later died of hantavirus.

In a good news, suspected cases from Singapore and the Netherlands have reportedly turned negative.

The health officials across 12 countries have joined the WHO in contact tracing efforts. They are:

• Canada
• Denmark
• Germany
• The Netherlands
• New Zealand
• Saint Kitts and Nevis
• Singapore
• Sweden
• Switzerland
• Türkiye
• The United Kingdom
• The United States of America

US CDC Classifies Outbreak As 'Level 3' Emergency

The US Centers for Disease Control and Prevention (CDC) activated its Emergency Operations Centers and has classified the hantavirus outbreak as "Level 3" emergency.

Level 3 is the lowest level of emergency activation and is typical for this stage, ABC News reported.

It also signifies that the risk of the rat-borne virus to the general public remains low. However, the public health agency is actively monitoring the situation.

As per the media report, activating the Emergency Operation Centers signals that an emergency team, consisting of epidemiologists, scientists, and physicians, may have been set up to assist with the response.

No Immediate Public Health Threat To India, says ICMR

After reports of two Indian nationals infected with hantavirus aboard MV Hondius cruise ship, Dr Naveen Kumar, director of the ICMR’s National Institute of Virology (NIV), said that there is "no immediate public health threat” to India.

Dr Kumar said the outbreak appears to be isolated, and that there is currently no evidence of community spread. He stressed that, unlike COVID-19, hantavirus does not spread easily between humans.

“The reported hantavirus cases appear to be isolated ones, and there is no immediate public health threat to India,” he was quoted as saying by news agency PTI.

According to the World Health Organization, the Indian passengers were among a small cluster of suspected infections identified aboard the ship, with health authorities monitoring contacts and taking precautionary measures.

Surveillance Capacity Adequate In India

Kumar said India has sufficient laboratory infrastructure to detect suspected hantavirus cases through the ICMR-NIV and the nationwide Viral Research and Diagnostic Laboratory Network.

“India has diagnostic capacity for hantavirus infection through the ICMR-National Institute of Virology and the nationwide Viral Research and Diagnostic Laboratory Network of 165 labs,” he said.

He said symptoms generally appear one to five weeks after exposure. It includes

fever,

• severe body ache,
• headache,
• fatigue,
• nausea,
• abdominal pain,
• dry cough.

2 Indians Among Crew On MV Hondius Cruise Ship

Two Indians are among 149 people aboard MV Hondius, the expedition cruise ship hit by a deadly hantavirus outbreak that has so far left three passengers dead and eight others infected, according to a BBC report.

The vessel, operated by Oceanwide Expeditions, began its journey from Ushuaia, Argentina, on April 1 and is currently travelling to Spain's Canary Islands on May 10.

According to the World Health Organization, eight people onboard the cruise ship MV Hondius have been infected with hantavirus. Of these, three have died, and five have been confirmed to have the virus. However, more people are likely to be infected, as the disease can take a long time to show symptoms.

The luxury cruise ship was carrying around 150 passengers and crew members from 28 countries.

The nationalities included 38 people from the Philippines, 31 from the United Kingdom, 23 from the United States, 16 from the Netherlands, 14 from Spain, nine from Germany, six from Canada and two crew members from India, BBC reported.

While it is yet not known whether they're infected or not, Dr Puneet Misra, Professor of Community Medicine, AIIMS Delhi, told ANI News Agency that it is likely that the two passengers "might have been exposed to the infection".

He added that "there is no pandemic or epidemic threat" with hantavirus. "The public should not worry. There is no need for panic..."

Follow this page for all latest updates.

US President Donald Trump is hopeful that the deadly hantavirus outbreak is very much under control. However, questions are mounting as his administration cut funding to study the rat-borne virus last year.

According to the World Health Organization, eight people onboard the cruise ship MV Hondius have been infected with hantavirus. Of these, three have died, and five have been confirmed to have the virus. However, more people are likely to be infected, as the disease can take a long time to show symptoms.

Speaking to reporters Thursday, Donald Trump sought to reassure Americans that the situation appeared contained.

“It’s very much, we hope, under control,” Trump said during an impromptu appearance near the Lincoln Memorial Reflecting Pool in Washington, DC. The President added that the administration planned to release “a full report” on the incident and said health officials were continuing to study the outbreak closely.

“We’re doing the best we can,” Trump told reporters when asked whether Americans should worry about the wider spread of the virus.

Notably, at least 23 passengers from the hantavirus-affected MV Hondius cruise ship returned home, including several to the United States — and one of them has already fallen ill.

Hantavirus Cases In The US?

The travelers reportedly did not know they had been exposed to the deadly virus when they disembarked during the ship’s stop at Saint Helena, a remote island in the South Atlantic, on April 23.

People in at least five US states — Georgia, Arizona, California, Texas, and Virginia — are reportedly being monitored for possible hantavirus exposure, though none have shown symptoms.

According to Dr. Jay Bhattacharya, Director of the US National Institutes of Health (NIH), “Hantavirus is not spread by people without symptoms, transmission requires close contact, and the risk to the American public is very low.”

CDC Cuts On Hantavirus Research

Behind the public reassurance, however, health authorities are confronting a situation that remains poorly understood — particularly because the Trump administration last year cut funding to study the virus behind the deadly cruise ship outbreak, and also fired scientists in key positions who were tracking viruses.

The Centers for Research in Emerging Infectious Diseases were designed to study viruses that could jump from animals to people, including hantavirus, but in 2025, the National Institutes of Health said the work would not continue.

Further, in its 2026 budget request, on one hand, the Trump administration said it planned to refocus the CDC on outbreak investigations and preparedness; on the other hand, it proposed eliminating about $750 million in preparedness grants that states rely on to cope with natural and man-made disasters, including outbreaks.

It also zeroed funding for the Hospital Preparedness Program, which strengthens healthcare systems to respond to emergencies, saying the program “has been wasteful and unfocused”, the New York Times reported.

Notably, the effects of the Trump administration’s cuts to infectious disease research are also being felt globally. South Africa has the capacity to sequence the hantavirus partly because of investments made by previous US administrations through the President’s Emergency Fund for AIDS Relief (PEPFAR), Dr. Carlos del Rio, an infectious disease expert at Emory University, told reporters.

However, the Trump administration has significantly reduced support for South Africa’s research system and is pulling back funding for PEPFAR.

“I worry that as we disinvest in global health, we’re losing our capacity — our global capacity — to deal with diseases,” Dr. Del Rio said.