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.

The US Food and Drug Administration (FDA) has issued new guidance urging veterinary drug makers to define the duration of antibiotic use in livestock.

The February 2026 guidance, published by the FDA’s Center for Veterinary Medicine (CVM), aims to mitigate the development of antimicrobial resistance and protect public health. It is consistent with previous recommendations by the federal agency that promoted the judicious use of medically important antimicrobial drugs in animals.

The FDA said that the guidance is intended for sponsors of approved new animal drug applications (NADAs) and abbreviated new animal drug applications (ANADAs) containing antimicrobial drugs.

The guidance provides recommendations on how to add duration limits to medically important antibiotics used in or on the medicated feed of food-producing animals.

"The framework outlined in this guidance is intended to facilitate voluntary changes to have all medically important antimicrobial new animal drugs administered in alignment with the principles of judicious use,” the FDA said.

"This guidance provides specific recommendations on how sponsors may facilitate changes to the approved conditions of use of affected products in support of ongoing efforts to mitigate the development of antimicrobial resistance,” it added.

The New FDA Recommendations

Currently, no limit has been set for the approved treatment in food-producing animals. As a result, farmers can use the antibiotics in animal feed for extended periods of time.

The proposed guidelines for “appropriately defined duration of use” labelling will ensure that the drug is used only when animals need it.

The regulator also called the industry to “revise the labeling to include appropriate criteria regarding when to begin and end feeding of the antimicrobial drug.”

The nonbinding guidance also suggests sponsors avoid instructions like “feed until market weight” to define the duration of use.

"The scope of this guidance is limited to those drugs that are approved for use in or on animal feed because all the approved uses of medically important antimicrobial drugs in other (non-feed) dosage forms already have appropriately defined durations of use," the FDA said.

Why Misuse of Antibiotics In Animals Is A Concern

Antibiotic use in livestock and poultry globally is intended to treat, control, and prevent bacterial infections.

However, their overuse and misuse in food-animal production threaten both animal and human health. It is because these promote the emergence and spread of antimicrobial resistance (AMR).

AMR in livestock is a major driver of the 700,000 to over 1 million annual human deaths linked to drug-resistant infections globally.

With roughly 70 per cent of global antibiotics used in agriculture, this misuse contributes to food-borne resistant pathogens and is projected to drive up to 10 million annual human deaths by 2050, as per the World Organisation for Animal Health.

FDA On Antibiotic Use In Livestock

The 2017 guidance issued by the FDA limited the over-the-counter use of medically important antibiotics on livestock.

It also required a prescription and veterinary oversight for all antibiotic use.

Later in 2018, the CVM called for all antibiotics used in the feed and drinking water of food -producing animals to have “an appropriately targeted duration of use”.

A shortage of prescription-strength co-codamol is set to continue until at least June, leaving thousands of chronic pain patients across the UK uncertain about how they will manage daily symptoms. The Scottish government has confirmed limited availability of the strongest 30/500mg tablets, while health boards warn alternative medicines may not fully cover demand.

The shortage is linked to delays in authorization by the Indian government for exporting key codeine-based ingredients needed to manufacture the drug.

Patients Told To Taper Use

Many patients say they first learned of the disruption through calls from local health services. Some have already been advised to slowly reduce their dose to avoid withdrawal symptoms.

Jocelin Harrison, who has relied on the medication for more than three decades after five spinal surgeries, said she was contacted by NHS Lanarkshire and instructed to cut down gradually.

“The only advice I’ve been given so far was to reduce the tablets and try to manage my withdrawal symptoms,” she said, as reported by the BBC.

“I was not offered any other advice or possible replacement pain killers and it’s a great worry for me and other chronic pain sufferers throughout Scotland and the UK.”

Doctors warn that abruptly stopping co-codamol can trigger headaches, nausea, sweating and a sudden increase in pain, particularly for long-term users.

Why Does This Drug Matter So Much?

Co-codamol combines paracetamol with the opioid codeine and is commonly prescribed after surgery or for persistent musculoskeletal conditions. It comes in three strengths: 8mg, 15mg and 30mg of codeine with 500mg paracetamol.

The lowest strength is available over the counter, but the stronger forms require a prescription and are widely used by patients with chronic pain. Because codeine can cause dependence, tapering rather than stopping suddenly is considered essential.

Health boards say supplies of alternative strengths are also limited, making it difficult to simply switch everyone onto another version.

Guidance issued locally states patients, except those undergoing cancer treatment, should gradually reduce usage until stopping completely. No new patients will be started on the medication until supplies stabilize.

What Are The Alternatives?

NHS Grampian has urged pharmacists to prioritize existing stock carefully. However, it stopped short of telling patients to immediately begin cutting back, highlighting variation in local guidance.

Officials acknowledge substitutes exist, but warn they cannot meet the expected rise in demand from patients switching medicines.

Authorities Now Work On Solution

Scotland’s chief pharmaceutical officer Alison Strath said the issue ultimately sits with UK-wide medicine supply systems but confirmed discussions are ongoing.

“Supply issues are expected until June 2026 and we are in regular contact with the UK government to seek assurances they are doing all they can to resolve this,” she said, adding that affected patients will be contacted directly about alternative treatment options.

The UK Department of Health and Social Care said most medicines remain readily available and manufacturers are working to restore production.

The shortage highlights the global nature of generic drug manufacturing. Medicines such as co-codamol 30/500mg are typically produced using ingredients sourced from India and China, meaning regulatory or production delays overseas can quickly affect patients at home.

For now, patients are being urged not to contact GP practices unless advised and to wait for further instructions from their health providers.

Measles Outbreak In UK: A measles outbreak has been confirmed in London's north east area, noted the BMJ. As per the medical journal, the outbreak is among the unvaccinated children. The medical journal also noted that there have been 96 laboratory confirmed cases of measles in England between January 1 to February 9, 2026 and more than a third, which is 34 cases are from Enfield. BMJ also noted that Enfield is also the area with lowest vaccination rates.

As per the data by the UK Health Security Agency or the UKHSA, only 64.3% of 5 year-olds Enfield received both doses of the measles, mumps, and rubella or the MMR vaccine in 2024 and 2025. The majority (74 of 96, 77%) of measles cases confirmed in the UK so far this year were in children aged 10 and under. Some 64% of cases have been in London, 26% in the West Midlands, and 4% in the East Midlands.

Read: Unique Symptoms Of Measles In 2026 And How Long Does The Infection Last?

Measles Outbreak In UK: Previous Cases And How It Made A Comeback

Last month, the World Health Organization revoked the United Kingdom’s measles elimination status after the virus was found to be circulating continuously for over a year.

In 2025, a child in Liverpool died after contracting measles, prompting renewed pressure on the NHS and government to address its return. England recorded 959 laboratory-confirmed cases that year. Although lower than the 2,911 cases in 2024, it still marked the highest annual total since 2012.

Vaccine uptake has steadily declined over the past 12 years. Only 84.4% of children in the UK receive both doses of the MMR vaccine by age five, far below the 95% coverage needed for herd immunity.

Why Has Measles Return To The UK?

In late 2023, measles outbreaks were reported in the UK, which led to a surge in cases in 2024. Vaccination uptake at the end of 2024 was 92% for the first dose, however, for the second dose, it was below 82%.

Dr Vanessa Saliba, consultant epidemiologist at UKHSA said, "Infections can return quickly when childhood vaccine uptake falls - measles elimination is only possible if all eligible children receive two MMRV doses before school. The NHS is making vaccination easier, including offering the second MMRV dose earlier at a new 18-month appointment to boost uptake and support elimination goals."

Read: UK Loses Measles Elimination Status: Why Is This Disease Making A Comeback?

She also noted that children and adults must get vaccinated as NHS also offers catch-up jabs.

Dr Baharat Pankhania, from the University of Exeter, as reported by the BBC said, "Measles is an infection that can be prevented by vaccine - and it's extremely concerning that in the UK we now have pockets of low or no vaccine uptake. We urgently need to remedy this situation." Pankhania also noted that there is a need to make the access to GPs easier, and for an effort that could immunize babies in their homes and counter wrong information around vaccine safety.