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 approved a drug therapy to address neurologic symptoms of a rare genetic disorder — Hunter syndrome.

The X-chromosome-linked disease, occurring predominantly in males, has an estimated 2,000 affected individuals worldwide.

The drug Avlayah, developed by pharma company Denali Therapeutics, targets certain individuals with Hunter syndrome (Mucopolysaccharidosis type II or MPS II).

It is the first therapy to address the neurologic complications of Hunter Syndrome, such as

• progressive cognitive decline,
• behavioral problems,
• hydrocephalus,
• spinal cord compression,
• seizures,
• carpal tunnel syndrome.

“Today is a milestone day for children and their families battling Hunter syndrome,” said FDA Commissioner Marty Makary, in a statement.

“Avlayah is the first product approved to address neurologic complications of Hunter Syndrome, a very rare and often severe X-linked disorder in children, affecting about 500 people in the US, almost exclusively males,” added Acting CDER Director Dr. Tracy Beth Hoeg.

The FDA noted that Avlayah, the once-weekly drug given via IV infusion, must begin in presymptomatic or symptomatic pediatric patients weighing at least 5 kg before advanced neurologic impairment.

What Is Hunter Syndrome?

Hunter syndrome is a rare inherited lysosomal disorder in which sugar molecules called glycosaminoglycans build up within the cells’ lysosomes.

The condition affects physical and mental development and causes abnormalities in the skeleton, heart, respiratory system, brain, and other organs.

Hunter syndrome is a rare congenital metabolic disease. It was first reported in 1917 by a Canadian physician, Charles Hunter, in two brothers in a family.

The brothers presented typical signs, such as

• short stature,
• inguinal hernia,
• macroglossia,
• enlarged skull,
• decreased hearing,
• coarse facial features,
• protruded abdomen with hepatosplenomegaly,
• umbilical hernia,
• skeletal deformities.

The younger brother had symptoms of Central Nervous System (CNS), including seizures and cognitive decline, while the older brother did not have CNS involvement.

The estimated incidence is 1 in 162,000 live male births.

How The FDA Approved Avlayah

The FDA approval came after Avlayah showed promise in reducing cerebrospinal fluid heparan sulfate — one of the glycosaminoglycans that accumulates in the body in this disorder and is linked to the organ damage that occurs in early childhood.

The phase 1/2 multi-cohort, single-arm, open-label trial enrolled 47 pediatric patients with Hunter syndrome aged 3 months to 13 years.

Of these, 44 patients with measurements at had a 91 percent average decrease from baseline in CSF.

Denali is now conducting a randomized clinical trial that is more than 95 percent enrolled to evaluate the clinical benefit of this product.

"In the meantime, families with young children with Hunter Syndrome will have access to a product that may favorably alter the course of the disease at the crucial time in life when there is the greatest potential for benefit," Hoeg said.

Are There Any Side Effects?

Avlayah’s labeling includes a boxed warning for allergic reactions, including anaphylaxis, associated with the drug.

The FDA recommended that patients start therapy in a health care setting with appropriate medical monitoring and support measures.

The common side effects of Avlayah include

• upper respiratory tract infection,
• ear infection,
• fever,
• anemia,
• cough,
• vomiting,
• diarrhea,
• rash,
• COVID-19,
• runny nose,
• nasal congestion,
• fall,
• headache,
• skin abrasion,
• hives.

The FDA also suggested that healthcare workers monitor

• hemoglobin levels due to the risk of anemia,
• kidney function and urine protein levels due to
• the risk of membranous nephropathy (a kidney disease).

The Central Drugs Standard Control Organisation (CDSCO) has now launched a nationwide crackdown on unapproved Fixed Dose Combination (FDCs) after 90 combination medicines that were being sold without mandatory central approval were busted last week.

CDSCO, India's apex drug regulatory body in the country, made the shocking discovery after scrutinizing drug samples uploaded on the SUGAM portal, the government’s online system for drug testing data.

Several of these samples were found to fall under the ‘new drug’ category but lacked approval from the central authority. As a result, the CDSCO wrote a letter to all states and union territory drug controllers, asking them to investigate manufacturers and marketers of these FDCs.

The letter reads: "The SUGAM lab testing data for the year 2025, a large number of drug samples (FDCs) are detected as unapproved and fall under the category of 'New Drug'. No new drug shall be manufactured for sale unless it is approved by the Licensing Authority 'as defined in Rule 3 of New Drugs and Clinical Trial Rules, 2019, Further, as per Rule 80 of New Drugs & Clinical Trial Rules 2019, a person who intends to manufacture new drug in the form of API or Pharmaceuticals formulation, as the case may be, for sale or distribution, shall make an application for grant of permission to the Central Licensing Authority in Form CT-21 along with a fee as specified in Sixth Schedule."

"The presence of unapproved drugs in the supply chain is a matter of serious concern, posing potential risks to public health and safety. It also indicates non- compliance with the provisions of the Drugs and Cosmetics Act, 1940, and rules made thereunder.

"Accordingly, please initiate appropriate investigation and regulatory action against the concerned manufacturers, marketers, and other stakeholders, as deemed fit. Kindly ensure strict monitoring and enforcement to prevent manufacture, sale, and distribution of such unapproved drugs," the letter states, on appropriate action against the sale and distribution of unapproved drugs.

FDCs are drugs that contain two or more active ingredients in a single formulation. The CDSCO has asked states to investigate and submit reports on the action taken at the earliest.

What Made It To The Unapproved List Of FDCs?

Cough And Cold Medicines

Cough and cold combination medicines have formed the single largest group. At least 14 to 16 entries show combination of ingredients found in everyday pharmacy shelves: dextromethorphan, ambroxol, guaiphenesin, chlorpheniramine, phenylephrine, terbutaline, and menthol in various permutations.

Several of these are sold as flavoured syrups for children. Budesonide-levosalbutamol inhalation suspension that is used for asthma and chronic obstructive pulmonary disease, too features in the list.

Nutritional Supplements

The next group is of the vitamins, minerals and other nutritional supplement which has roughly 18 to 20 entries. They include:

• Multivitamin capsules
• Iron-folic acid syrups
• Calcium-vitamin D3-K2 combinations
• Abapentin-methylcobalamin preparation

This group has accounted for at least 10 entries, which include antifungal creams that could lead to potential misuse and skin damage when sold without prescriptions.

Anti-Diabetic Medicines

This has accounted for six entries, and the combination includes:

• Glimepiride paired with metformin or pioglitazone

What Is India's Rule For FDCs?

Under India's New Drugs and Clinical Trial Rules of 2019, any FDC is treated as a new drug and must have the central government's approval before it could be manufactured and sold. The regulator's letter noted that there were presence of unapproved drugs in the supply chain that could pose risks to public health. This also amounts to a violation of the Drugs and Cosmetics Act, 1940.

“The presence of unapproved drugs in the supply chain is a matter of serious concern, posing potential risks to public health and safety. It also indicates non- compliance with the provisions of the Drugs and Cosmetics Act, 1940, and Rules made thereunder," it said.

DCGI urged states and UTs "to examine the unapproved FDCs in generic name as mentioned in the attached annexure". This is done to check whether any approval has been granted by the local office. "Accordingly, please initiate appropriate investigation and regulatory action against the concerned manufacturers, marketers, and other stakeholders, as deemed fit. Kindly ensure strict monitoring and enforcement to prevent the manufacture, sale, and distribution of such unapproved drugs," the letter noted.

Breakbone Fever, also known as dengue, is a mosquito-borne disease that is once again on the rise, with the U.S. Centers for Disease Control and Prevention issuing a travel alert across 17 Countries.

The federal agency flagged 'Level 1' risk for breakbone fever, calling for practicing usual precautions. It stated a higher-than-expected number of cases and urged people planning to travel to countries with an uptick in cases to be aware of the risk.

The CDC alert issued on March 23 identified 17 countries reporting an increased number of cases of dengue. These include: Afghanistan, Bangladesh, Bolivia, Colombia, Cook Islands, Cuba, Guyana, Maldives, Mali, Mauritania, New Caledonia, Pakistan, Samoa, Sudan, Timor-Leste, Vietnam, and the United States territories of American Samoa, Puerto Rico, and the US Virgin Islands, where local transmission is already common.

In 2026, the US reported a total of 496 dengue cases to date, and the vast majority of these cases were reported among people who contracted the illness while traveling abroad.

The CDC advised travelers to risk areas to prevent mosquito bites by

• using an EPA-registered insect repellent,
• wearing long-sleeved shirts
• long pants when outdoors,
• sleeping in an air-conditioned room or a room with window screens.

What Is Dengue? Why Is It Called Breakbone Fever

Dengue is a disease caused by a virus spread through mosquito bites. It is transmitted through infected mosquitoes, primarily the species Aedes aegypti.

The breakbone fever is caused by an infection with any of four different dengue viruses. These include:

• Dengue virus type 1 (DENV-1 or DEN-1)
• Dengue virus type 2 (DENV-2 or DEN-2)
• Dengue virus type 3 (DENV-3 or DEN-3)
• Dengue virus type 4 (DENV-4 or DEN-4)

Common Symptoms of the dengue are:

• Sudden onset of high-grade fever.
• Intense headache
• Severe muscle, joint, or bone pain.
• Skin Rash that often appears 2–5 days after the fever starts
• Nausea and Vomiting
• Minor bleeding
• Fatigue.

The disease can take up to 2 weeks to develop, with illness generally lasting less than a week.

However, it can quickly become severe within a few hours, usually requiring hospitalization.

In severe cases, health effects can include hemorrhage (uncontrolled bleeding), shock (seriously low blood pressure), organ failure, and death.

Breakbone Fever: Global Burden

According to the World Health Organization (WHO), about half of the world's population is now at risk of dengue.

It estimates that:

• About 390 million dengue infections occur annually worldwide
• Nearly 100 million people develop symptoms each year

The two main authorized vaccines in the world against dengue are Dengvaxia and Qdenga.

These vaccines are designed to protect against all four serotypes of the virus, with a focus on reducing severe disease and hospitalizations.

In addition, the Butantan-DV vaccine developed by the Butantan Institute in São Paulo has shown potential to be over 80 percent effective in preventing the risk of severe disease for up to five years. It also offers broader protection against all four dengue serotypes.