A heavy fog that "smells like chemicals" has been covering several parts of the United States lately, raising health concerns for people exposed to it. Reports have described sore throats and coughing, fatigue, and eye irritation among the exposed. But why does this fog smell so weird, and why are some people falling ill?

In this article, we will explore the science behind this phenomenon, how fog forms, and why it might sometimes carry chemical odors that linger in the air. By the end, we will also debunk some of the more speculative claims that have surfaced in the wake of this mysterious fog event.

The ‘Chemical Fog’ and Its Health Impacts

The fog has started trending on social media, with multiple users saying that it smells of fireworks, chemicals, or even sewage. David Bamber of St. Petersburg, Florida, shared a very popular TikTok video describing the sensation of walking through the fog and having the feeling of inhaling something toxic. Others reported developing respiratory conditions, including sore throats, coughs, and general fatigue, which they blamed directly on the fog. In fact, a Florida resident described how, following a short detour at a gas station, she started sneezing uncontrollably and became feverish, with stomach cramps as well. For some, this "sickness-fog" has become an urgent health issue.

As alarming as this is, the mist might not seem so evil. After all, there are scientifically established reasons about how fog functions with its surroundings, especially relating to pollutants, which could strengthen the odor it has.

Fog Formation and Its Chemical Absorption

This takes place when the water vapor present in the air condenses to become small water droplets and eventually form a low-lying cloud, making visibility hard to perceive. Such droplets will act as natural scavengers absorbing all airborne pollutants and particles. Moisture contained within the fog will amplify the concentration of pollutants such as chemicals and odors to make them much stronger and hence easily noticed.

According to Washington University atmospheric scientist Professor Rudolf Husar, chemicals trapped within the fog droplets "include sulfur oxides and nitrogen oxides, gases primarily produced by industrial activity, vehicle emissions, and, more rarely, natural fires. Those chemicals stay in the air a long time, especially because when they are trapped in these droplets, they become concentrated and kindle chemicals and odors in the surrounding environment.". This process is known as "scavenging," where fog droplets absorb gases and pollutants, allowing them to linger longer than they might in clearer air.

Also Read: Health Concerns Rise As US, Canada, and UK Come Under The Blanket Of Thick, Dense, Toxic Fog

The reason why this fog smells so potently is that humidity increases the way smells move. When water molecules in the air combine with odor-causing molecules, they tend to last longer and thus become more pronounced to our noses. This explains why some people have reported that the fog smells like chemicals or even like sewage, depending on the surrounding environment's air quality.

What Role Does Atmospheric Conditions and Pollutants Play?

More than just an atmospheric visual appearance, fog could often trap most kinds of pollutants when the ground-adjacent layers are extremely cold, often experienced during the cold season. As it douses many inhabited spaces, pollution is able to cling with the fog through smokes emitted from vehicles, factory chemicals, among other things. When people inhale this "chemical fog," they may feel irritation in the respiratory system. It is particularly more sensitive to individuals with pre-existing conditions, like asthma, who have airways that are easily irritated by a change in air quality.

In addition, air pollution generally causes a variety of health issues, from simple coughing and congestion to severe respiratory problems. The moisture of the fog increases these effects, introducing more water into the lungs and causing irritation. This is why some people may feel shortness of breath, chest pain, or even experience wheezing when exposed to dense, polluted fog.

Fogs often occur where, for instance, Florida regions do, following a specific set of weather, often temperature inversion. In cases of temperature inversions, there will be cooler air trapped very close to Earth by warmer air over it so that pollutants from whatever source have less space to dispel into the atmosphere. That accumulated pollutant within the fog contributes to having that chemical even more pungent.

Besides pollution, local moisture sources heavily influence fog. For example, areas next to large bodies of water like the San Francisco Bay often see thick fog in summer months as the water chills the surrounding air. However, in some areas, fog can form where moisture from the ground is evaporating into the air, condensing, and forming thick fog near the surface. Moisture, once condensed, can absorb pollutants and enhance existing odors.

Is There a Conspiracy Behind the Fog?

As the fog event has continued, some people have begun to speculate that there might be a more sinister or secretive explanation for the phenomenon. Conspiracy theories have been circulated, suggesting that the fog could be the result of a chemical weapon or even a government experiment. Such claims have largely been fueled by comparisons to Operation Sea Spray, a controversial U.S. The Navy biological warfare experiment in the 1950s where bacteria were released in the San Francisco Bay area to test the city's vulnerability to biowarfare.

Also Read: When Fear Clouds Judgment- The Psychology Behind The Mysterious Fog Over US And Canada

Even if the thought of a planned chemical fog, produced by humans, is quite threatening, science cannot prove such an idea. In fact, according to experts, the cause for the fog may simply be a part of the regular weather, in combination with higher concentrations of pollutants from human sources. Chemicals in the air, specifically sulfur and nitrogen compounds, are nothing but by-products of industrial pollution, not some sort of deliberate attack.

Why Does Fog Smell Like Chemicals?

In summary, the chemical-like odor produced by fog is a result of various environmental and atmospheric conditions. Due to fog's natural collecting characteristic, pollutants are trapped inside the fog droplets, which are very small in size. Thus, these pollutants include sulfur and nitrogen oxides, which are usually derived from vehicle emissions, industrial processes, and even wildfire cases. The moisture in the fog makes these odors more observable and potent.

Fog is not dangerous in itself, but the pollutants it captures can cause irritation to the respiratory system, especially for people who have pre-existing health conditions. Knowing how fog forms and how it interacts with its surroundings will help us prepare better for the effects of fog and address health concerns that may be triggered.

Even if this recent bout of fog caused concern, there's scientific logic for why this situation is not to be worried about. Nonetheless, being cognizant and knowing the quality of air is also a form of mitigation from this thick chemical smell fog that affects health.

In adults, long periods of sleep deprivation has been linked to problems such as weakened immunity, weight gain, depression, and an increased risk of dementia. However, scientists are now paying closer attention to how sleep affects the brain much earlier in life.

However, a new University of North Carolina School of Medicine study suggests that disrupted sleep during early childhood may interfere with key stages of brain development and asl well as increase the risk of developing autism.

Why Sleep Matters For The Developing Brain

Sleep plays a crucial role in helping these synapses form and strengthen. During sleep, the brain organizes and stabilizes these neural connections, shaping the foundation for future brain function. If sleep is repeatedly disrupted during this delicate stage of development, the process may be affected.

Frequent waking or sleep disturbances could interfere with how these neural connections are formed, potentially influencing behavior and cognitive abilities later in life.

The Link Between Sleep And Autism

“The unique effects of sleep loss during development are largely unexplored,” Diering said. “Our data show that babies and children are more vulnerable to the negative effects of sleep disruption. We also found that sleep loss during this crucial period of time can negatively interact with underlying genetic risk for autism spectrum disorder.”

Sleep problems are already known to be common in people with autism. In fact, sleep disruption has been reported in more than 80 percent of individuals with autism spectrum disorder. However, researchers have long debated whether these sleep issues are a cause of the disorder or a consequence of it. Understanding how sleep interacts with brain development could help scientists detect autism earlier and potentially develop new treatment strategies.

Studying Sleep Disruption In Early Life

In earlier work conducted in 2022, researchers examined how sleep disruption during early life might interact with genetic factors linked to autism. Using mouse models, they disrupted sleep during the third week of life, a developmental stage roughly comparable to ages one to two in humans.

The study found that sleep disruption during this period produced long lasting behavioral changes. Male mice that were genetically vulnerable to autism showed deficits in social behavior later in life. These results suggested that sleep disruption during critical stages of development may interact with genetic risk factors in ways that shape long term behavior.

Younger Brains Respond Differently To Sleep Loss

To investigate further, researchers studied how developing and adult mice respond differently to sleep deprivation.

Using specially designed housing systems equipped with sensitive sensors, scientists tracked the animals’ breathing and movement. This allowed them to determine when the mice were awake and when they were asleep.

The researchers observed that adult mice were able to compensate for lost sleep. After experiencing sleep deprivation, the adults increased their sleep later during their normal active period. This process, known as sleep rebound, allowed them to recover some of the lost rest.

Younger mice behaved very differently. They showed no sleep rebound at all, meaning they did not compensate for the sleep they had lost. This finding suggests that younger brains may be far more vulnerable to the effects of sleep disruption.

The consequences were also visible in cognitive performance. Sleep deprived young mice performed poorly on learning and memory tasks, while adult mice were significantly more resilient after losing sleep.

Changes At The Level Of Brain Synapses

The results showed that sleep deprivation in young mice significantly altered the formation of synapses. These changes were not seen in adult mice. “This now provides one of the largest and most comprehensive datasets to examine the molecular effects of sleep loss across the lifespan,” Diering said.

Potential Future Treatments

“Development is not something that one can go back and do again,” Diering said. “Sleep is important for the entire life and especially during development. Understanding what we know now will place greater emphasis on understanding sleep issues in ASD and could lead to an important therapeutic avenue to treat ASD and other developmental conditions.”

The findings highlight an important message for parents and caregivers. During early childhood, healthy sleep patterns may play a critical role in shaping the brain for years to come.

Using amphetamines, cocaine and cannabis can significantly increase your risk of having a brain stroke particularly among younger adults, according to a new University of Cambridge analysis

The findings highlight how recreational drug use may contribute to a preventable health risk, especially among people under the age of 55.

Megan Ritson, a stroke genetics researcher at the University of Cambridge and lead author said the results provide strong evidence linking certain drugs to stroke risk.

“These findings provide compelling evidence that drugs like cocaine, amphetamines, and cannabis are causal risk factors for stroke,” Ritson noted.

A stroke occurs when blood flow to part of the brain is interrupted. This can happen when a blood vessel becomes blocked by a clot, known as an ischemic stroke, or when a blood vessel bursts and causes bleeding in the brain, known as a hemorrhagic stroke. Both types can lead to serious brain damage and can be life threatening.

Amphetamines Associated With The Highest Risk

When researchers combined data from eight previous studies, they found that recreational amphetamine use was associated with more than double the risk of stroke across all adult age groups. For individuals under the age of 55, the increase was even greater. In this group, amphetamine use was linked to nearly triple the risk of stroke compared with people who do not use the drug.

Across all age groups, the analysis found that amphetamine use increased the risk of ischemic stroke by 137 percent and hemorrhagic stroke by 183 percent. These figures reflect relative risk, meaning the probability of stroke is higher among users compared with non users.

Cocaine Shows A Similar Pattern

The analysis showed that cocaine use nearly doubled the risk of stroke of any kind and more than doubled the risk of hemorrhagic stroke. Additional genetic investigations were conducted alongside the main analysis to better understand whether the relationship might be causal rather than simply linked to other lifestyle factors.

Eric Harshfield, a genetic epidemiologist at the University of Cambridge, said the findings suggest the drugs themselves may play a direct role. “Our analysis suggests that it is these drugs themselves that increase the risk of stroke, not just other lifestyle factors among users,” Harshfield said.

Cannabis Linked To Smaller But Significant Risk

Among people under the age of 55, cannabis use was linked to a 14 percent increase in stroke risk. Although the increase is lower than that associated with stimulant drugs, researchers say it remains important because cannabis is widely used.

Opioids Showed No Clear Association

A Preventable Health Risk

The researchers also note that many of the studies included in the analysis relied on participants reporting their own drug use. Because of this, other lifestyle factors could potentially influence the results. Further research will be needed to better understand the biological mechanisms involved and how different patterns of drug use may affect stroke risk. Still, scientists say the evidence now available provides an important foundation for future public health strategies.

“These findings give us stronger evidence to guide future research and public health strategies,” Ritson said.

In cities that rarely slow down, sleep is often the first thing people compromise. Late-night work calls, endless notifications, streaming platforms, and the pressure to stay productive are quietly cutting into the hours meant for rest. On World Sleep Day, health experts are raising concerns about a growing issue among urban professionals: sleep debt.

Sleep debt refers to the cumulative effect of regularly getting less sleep than the body needs. While it may seem harmless to sleep five or six hours on busy weekdays, the missing hours slowly add up and begin to affect both the body and the mind.

According to Dr. Manav Manchanda, Director and Head of Respiratory, Critical Care and Sleep Medicine at Asian Hospital, the problem is far more serious than many people realize.

“Sleep is not a luxury. It is a biological necessity,” he says. “Chronic sleep deprivation affects almost every system in the body. When people repeatedly ignore their sleep needs, it leads to hormonal imbalance, weakened immunity, mood disturbances and reduced productivity.”

The Urban Lifestyle And The Rise Of Sleep Debt

Urban professionals often pride themselves on staying busy. But long work hours, tight deadlines, frequent travel, and social obligations have created an environment where sleep is seen as negotiable.

Many people assume that sleeping longer on weekends can make up for lost rest during the week. However, doctors say the body does not recover so easily.

Sleep debt builds gradually when the body consistently receives less rest than it requires. Over time, this pattern begins to interfere with natural biological rhythms, making it harder for the body to regulate energy, focus and emotional balance.

When Lack Of Sleep Starts Affecting Performance

One of the earliest signs of sleep debt is a noticeable decline in cognitive function. People who do not get enough sleep often experience brain fog, poor concentration, irritability and slower decision-making.

In high-pressure professions such as corporate management, media, finance and technology, this can significantly impact work performance. Errors, missed details and reduced productivity can all stem from insufficient rest.

Dr. Manchanda explains that the effects are not limited to mental fatigue. “When the body does not get enough sleep, it disrupts several important systems including metabolism, hormone regulation and immune function,” he says.

The Health Risks Behind Chronic Sleep Loss

Persistent sleep deprivation can gradually increase the risk of serious health conditions. Experts link long-term sleep debt with obesity, diabetes, high blood pressure and heart disease.

Mental health can also be affected. Poor sleep patterns are associated with increased anxiety, mood swings and symptoms of depression.

“Over time, sleep debt can significantly increase the risk of metabolic disorders and cardiovascular diseases,” Dr. Manchanda adds. “People often underestimate how deeply sleep influences overall health.”

The Role Of Screens And Digital Habits

Another major reason behind sleep debt is digital dependency. Many professionals spend their evenings scrolling through smartphones or watching online content late into the night.

This habit exposes the eyes to blue light, which interferes with the release of melatonin, the hormone responsible for regulating the sleep cycle. As a result, the body struggles to recognize when it is time to wind down.

Building Better Sleep Habits

Doctors say improving sleep hygiene is one of the most effective ways to reduce sleep debt. Maintaining a consistent sleep schedule, limiting screen exposure before bedtime and avoiding caffeine late in the evening can help regulate sleep patterns.

Creating a calm sleeping environment and engaging in stress-relieving activities such as exercise or meditation may also improve sleep quality.

Experts believe workplaces also have a role to play. Encouraging better work-life balance and reducing after-hours communication can allow employees to prioritize rest.

On World Sleep Day, the message from doctors is clear. In a culture that celebrates constant productivity, sleep remains one of the most powerful tools for protecting long-term health and mental well-being.