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.

Amid the scare of hantavirus led by a rare strain that causes human-to-human transmission, the UK government has received supplies of the antiviral drug Favipiravir from Japan to tackle the risk of the rat-borne disease in the country.

The antiviral favipiravir, from the Japanese company Fujifilm, that gained fame during the COVID-19 pandemic, is being considered as an experimental option to treat the deadly hantavirus outbreak linked to the MV Hondius cruise liner. To date, the medication has been tested as an emergency treatment for new or re-emerging flu.

The UK Health Security Agency said that “the supplies of favipiravir would bolster treatment stocks, even though the risk of wider transmission in the UK remained very low”.

The hantavirus outbreak that began on MV Hondius has so far caused three deaths and 11 cases.

There is no specific therapy for hantavirus, which is primarily spread by rodents but can be transmitted between people in rare cases and after prolonged, close contact. Treatment usually focuses on supportive care such as rest and fluids, while some patients may need breathing support.

Favipiravir’s Role In Viral Treatment

In Japan, favipiravir is sold under the brand name Avigan by a unit of Fujifilm as an emergency medication for novel or re-emerging flu.

The drug works by blocking a key enzyme that many viruses need to multiply.

Use of favipiravir in hantavirus would generally be considered experimental or compassionate rather than standard care, and most likely to treat severe infection early on, said Piet Maes, a virologist at the University of Brussels, Reuters News Agency reported.

Maes said evidence so far comes only from lab and animal studies, with no strong human trial data showing the drug works against hantavirus. There is no internationally established clinical protocol recommending its routine use for hantavirus.

What Is Favipiravir?

Favipiravir is a broad-spectrum antiviral medication, most notably produced and marketed in India by Glenmark Pharmaceuticals under the brand name FabiFlu.

First approved in Japan for severe influenza, it became widely recognized for emergency use in the treatment of mild-to-moderate COVID-19 to help rapidly reduce viral load.

How Effective Has Favipiravir Been?

Favipiravir has remained controversial due to several side effects reported during the COVID-19 pandemic.

In 2023, in a rare complication from treatment with the COVID-19 antiviral, the eyes of a six-month-old baby boy from Thailand turned an unusual shade of blue.

According to researchers from Chulabhorn Royal Academy in Bangkok, the boy, who suffered fever and cough lasting one day, was diagnosed with COVID infection.

In a prior investigation, a higher frequency of uric acid elevation in younger patients treated with favipiravir was observed, which could be linked to decreased urine output.

In addition, favipiravir has also been shown to cause fluorescence in human hair and nails. This adverse effect may be due to the drug, its metabolites, or additional tablet components such as titanium dioxide and yellow ferric oxide.

India has created more than 880 million digital health identities under the country’s flagship mission, the Ayushman Bharat Digital Mission, said Union Health Minister JP Nadda today while addressing the 79th World Health Assembly (WHA) in Geneva.

Speaking at the plenary session, Nadda reaffirmed the country’s commitment to universal health coverage, digital health innovation, and global health solidarity.

“Ayushman Bharat Digital Mission is strengthening India’s national digital health ecosystem by creating over 880 million unique digital health identities, which facilitate longitudinal health records and a seamless continuum of care,” he said.

Expanding Universal Health Coverage

He noted that India is accelerating towards universal health coverage by expanding access to quality and affordable healthcare with a “whole-of-government” and “whole-of-society” approach.

The Union Health Minister informed the Assembly that India has established over 1,85,000 Ayushman Arogya Mandirs across the country to provide comprehensive primary healthcare services closer to communities.

The Minister also underlined the scale and impact of Ayushman Bharat Pradhan Mantri Jan Arogya Yojana, the world’s largest public health assurance scheme, covering nearly 600 million beneficiaries, particularly the most vulnerable sections of society.

Also read: 15 Lakh Indian Chemists To Join May 20 Strike; Govt Says Jan Aushadhi, AMRIT Stores To Stay Open

Focus On Pandemic Preparedness And Technology

Further, Nadda emphasized India’s efforts towards pandemic preparedness and resilient public health systems. He stated that the government is continuously strengthening healthcare infrastructure and emergency response capacities to effectively address future public health challenges.

He also highlighted the transformative role of technology in healthcare and stressed the growing role of Artificial Intelligence in healthcare in the country.

The Minister informed delegates that India has recently launched the Strategy for Artificial Intelligence in Healthcare for India. He emphasized that “the future of AI depends on our collective ability to build ethical and human-centric systems.”

Nadda reaffirmed India’s role as the “Pharmacy of the World” by highlighting the country’s leadership in the production of affordable generic medicines and vaccines.

Recalling India’s contribution during the COVID-19 pandemic, he stated that under the Vaccine Maitri initiative, India supplied nearly 300 million vaccine doses to around 100 countries, reflecting the nation’s enduring commitment to global health cooperation and solidarity.

The 79th World Health Assembly

Read More: No Ebola Case in India, Public Risk Low: Govt Steps Up Surveillance at Airports and Seaports

The 79th WHA will be held from May 18 to May 23 in Geneva under the theme “Reshaping global health: a shared responsibility.”

In his opening remarks at the Assembly, the WHO chief Tedros Adhanom Ghebreyesus referred to recent outbreaks of hantavirus and Ebola, as well as challenges including economic crises and climate change, stressing the need to “build a new global health architecture fit for the future.”

Tedros said this year’s Assembly will consider a proposal for a member state-led, WHO-hosted joint process to reform the global health architecture, Xinhua News Agency reported.

The 79th WHA will review over 60 agenda items, including technical issues such as noncommunicable diseases, mental health, universal health coverage, primary health care, and prevention and response to public health emergencies, as well as administrative issues such as financing, implementation, auditing, and oversight of the WHO’s 2026–2027 programme budget.

As the WHO’s highest decision-making body, the annual WHA is usually held in May in Geneva. Its main functions include deciding WHO policies and reviewing and approving the budget program. This year’s Assembly is scheduled to conclude on .

The third recorded outbreak of the rare Bundibugyo strain of Ebola in the Democratic Republic of Congo (DRC) has been declared a Public Health Emergency of International Concern (PHEIC) by the World Health Organization (WHO).

The 17th outbreak of Ebola virus in the Democratic Republic of the Congo has claimed over 130 lives, with more than 513 suspected cases, BBC quoted local officials as saying.

As per the US Centers for Disease Control and Prevention (CDC), there are also two confirmed cases and one death in Uganda.

With the disease spreading to newer regions and both the death toll and case count rising, experts have raised fresh global health concerns, noting that delayed detection may have allowed the virus to spread across multiple regions.

According to health authorities, early tests failed to identify the correct Ebola strain, leading to crucial weeks being lost before containment efforts began.

Bundibugyo Ebola Outbreak: A Look At How It All Began

The first known case was reportedly a healthcare worker in Bunia, DRC, who began experiencing fever, hemorrhaging, vomiting, and intense malaise on April 24. That person later died, according to the WHO.

However, it took another three weeks before health officials officially confirmed that Ebola was spreading.

Also read: Ebola Outbreak: University of Glasgow Researcher Explains Why Bundibugyo Virus Is Concerning

The WHO noted that a critical four-week detection gap between the onset of symptoms in the presumed index case, and the laboratory confirmation of the outbreak on May 14, suggests a low clinical index of suspicion among healthcare providers.

“This is compounded by the presence of co-circulating arboviruses and influenza-like illnesses, masking the initial index of suspicion for Ebola disease and exacerbating community transmission,” the WHO said.

Further, the infection and death of four healthcare workers within four days at Mongbwalu General Referral Hospital underscores critical breaches in infection prevention and control (IPC) protocols. A large number of community deaths have also been reported, potentially associated with unsafe burial practices, the WHO added.

The US CDC stated that the initial samples tested in DRC were negative for the Ebola virus, but by May 15, eight out of 13 samples tested positive, while five were inconclusive.

Using genetic fingerprinting, the illnesses were identified as the Bundibugyo virus, one of the four types of orthoebolaviruses that cause Ebola disease in people.

On May 17, the WHO declared the Ebola outbreak in Central Africa a “public health emergency of international concern.”

This marks the 17th Ebola outbreak in DRC since 1976. The previous outbreak ended in December 2025.

The current outbreak is the third involving the Bundibugyo virus. The strain was first identified during an outbreak in Uganda in 2007, which resulted in 131 cases and 42 deaths.

Another Bundibugyo outbreak was reported in 2012, killing 50 per cent of infected people in Uganda and 34 per cent in DR Congo.

Bundibugyo Ebola OutbreakWhy Delayed Detection Is Concerning

Speaking exclusively to HealthandMe, Professor Emma Thomson, Director of the Centre for Virus Research (Virology) in the School of Infection and Immunity at University of Glasgow, said the initial negative GeneXpert Ebola tests suggest the outbreak may have gone undetected for some time.

“The reports that initial GeneXpert Ebola testing was negative suggest that the outbreak may have gone undetected for some time, with early diagnostic blind spots delaying recognition,” she said.

Notably, Ebola cases have also been identified in Kinshasa and Kampala. According to Professor Emma, the spread to locations “hundreds of kilometers from Ituri province” indicates that the virus had already moved through human mobility networks before full containment measures were in place.

As a result, “the number of cases is going to go up pretty dramatically,” public health expert and Ebola survivor Craig Spencer told Associated Press.

Health experts stated that the outbreak went undetected for weeks because early tests looked for the wrong strain of the virus.

“Because early tests looked for the wrong strain of Ebola, we got false negatives and lost weeks of response time,” Matthew M Kavanagh of Georgetown University told AP. “We are playing catch-up against a very dangerous pathogen.”

Bundibugyo Ebola: No Approved Vaccine Or Treatment

More concerning is the fact that the outbreak is caused by the Bundibugyo strain, a rare form of Ebola for which there are no approved vaccines or specific treatments.

“We do not currently have a proven, licensed, Bundibugyo-virus-specific vaccine available for outbreak control,” Professor Emma told HealthandMe, stressing the need for urgent vaccine research.

She also highlighted the importance of strengthening therapeutics against the Ebola virus.