We are poisoning our environment and everything in it - including ourselves.

From the food we eat and the water we drink, to the air we breathe and the clothes we wear, synthetic chemicals have permeated every layer of human life. The evidence of harm is mounting.

Apr 09, 2026

an industrial factory with a lot of lights — Photo by mos design on Unsplash

A Contaminated World

We have, over the course of a century of industrialisation, turned the planet into an (failed) experiment. The atmosphere, the oceans, the soil, and the bodies of almost every living creature on Earth now carry chemical signatures that did not exist before the mid-twentieth century. Three categories of pollutant dominate the contemporary evidence base: per- and polyfluoroalkyl substances (PFAS), microplastics, and pesticide residues. Together, they represent what some researchers have termed a ‘slow poisoning’.

This is not a story of individuals making poor lifestyle choices. It is a story of structural decisions, about what industries are permitted to do, where they are permitted to do it, and who is left to bear the consequences.

PFAS: The Forever Chemicals That Will Outlast Us All

PFAS - per- and polyfluoroalkyl substances - is an umbrella term covering nearly 10,000 individual chemicals, united by their extraordinary chemical stability. That stability is precisely why they were so commercially attractive: they repel water, grease, and heat. Non-stick cookware, waterproof clothing, food packaging, firefighting foam, dental floss, PFAS have become the invisible backbone of modern consumer life.

They are also essentially indestructible. PFAS do not break down in the environment. They accumulate in water, soil, wildlife, and human tissue, a property that gives them their informal name: forever chemicals. Drinking water sources across England have now been found to be contaminated with PFAS, and concerns over the adequacy of UK regulatory limits have increased since a parliamentary inquiry was launched into the risks they pose.

The health implications are serious. Epidemiological studies have linked PFAS exposure to suppression of vaccine-induced immune responses in children, elevated cholesterol, changes in liver enzymes, reduced birth weight, and increased risks of kidney and testicular cancer. The Parliamentary Office of Science and Technology, in a 2025 briefing, confirmed these associations while noting that significant data gaps remain, particularly regarding the dose-response relationship for the thousands of less-studied PFAS compounds.

In the UK, the regulatory picture has become a source of concern. Since leaving the European Union, the UK has struggled to maintain the pace of chemical regulation set by its continental neighbours. A specific case in point: the herbicide Flufenacet, a known precursor to trifluoroacetic acid (TFA), itself a PFAS, remains approved for use in the UK despite having been withdrawn in the EU. Flufenacet acts as an endocrine disruptor that interferes with thyroid-stimulating hormones, creating a risk to brain development during pregnancy. It is also a skin sensitiser and has neurotoxic properties.

Meanwhile, the EU is moving toward a universal PFAS restriction across whole chemical classes; the UK has yet to match that ambition. A coalition of environmental organisations, including RSPB, the Rivers Trust, and Pesticide Action Network UK, has called for alignment with EU standards, warning that the UK’s voluntary drinking water standards are considerably weaker than the EU’s legally binding limits and even weaker still than those adopted in the United States.

The inequity of PFAS exposure is not incidental. Contamination hotspots cluster around industrial sites, military airbases, where firefighting foam was historically used, and landfill sites, facilities that, in the UK as elsewhere, have been disproportionately sited near deprived communities. A 2025 UKHSA analysis confirmed that people in the most deprived areas face disproportionate exposure to chemical and environmental hazards, with worse health outcomes as a consequence.

Microplastics: Part of Us, Whether We Like It or Not

Microplastics - particles under 5mm in size - are now ubiquitous in the environment. They have been detected in Arctic ice, deep ocean sediment, and even the summit of Everest. They have also been detected in human blood, placental tissue, lung tissue, brain and, most recently, in arterial plaques.

A landmark 2024 study published in the New England Journal of Medicine found microplastics and nanoplastics embedded in atherosclerotic plaques removed from patients undergoing carotid endarterectomy. Those with detectable particles in their arterial wall atheromatous plaques had a significantly higher risk of subsequent cardiovascular events, including heart attack and stroke. A subsequent Lancet Planetary Health review, published in late 2025, summarised a growing body of evidence linking microplastic exposure to metabolic, respiratory, cardiovascular, renal, hepatic, and neurodegenerative disorders, as well as an emerging, though not yet definitive, association with cancer.

Humans are exposed through ingestion, inhalation, and possibly dermal contact. We consume them in drinking water, seafood, beer, salt - just about anything we eat or drink. We inhale them in urban air. Most particles pass through the body without being absorbed, but a proportion, particularly the smallest nanoplastic particles, may cross biological barriers, entering the bloodstream and accumulating in tissues.

Research from the University of Birmingham published in 2024 raised another concern: when PFAS and microplastics were tested in combination, their toxic effects on aquatic life were synergistic - their combined effect is greater than the sum of the effects of each acting alone. The mixture caused developmental failure, stunted growth, and reproductive disruption in test organisms at concentrations routinely found in lakes, a finding with implications for human health, given that both pollutants are typically co-released from consumer products and travel together through water systems.

Occupationally, workers in textile manufacturing, recycling facilities, and plastic processing industries face far higher exposure than the general population, and those industries employ a workforce that is disproportionately drawn from lower-income groups, migrant communities, and the Global South. At a population level, communities living near busy roads and industrial zone, again the most deprived areas, face higher concentrations of airborne plastic particles alongside other forms of particulate pollution.

Pesticides: The Price Paid by Those Who Grow Our Food

Pesticide use has become a defining feature of industrialised agriculture. These chemicals protect crops from pests, disease, and competition, but they have also become one of the most thoroughly documented examples of chemically-mediated occupational harm, harm that falls almost exclusively on some of the world’s most economically marginalised workers.

A systematic review published in Environmental Research and Public Health in 2024 looked at decades of evidence and found consistent associations between chronic pesticide exposure and cancer, neurological disorders, endocrine disruption, and respiratory disease. Farmworkers with prolonged, high-intensity exposure had a 32% higher risk of developing COPD compared to unexposed individuals. Organochlorine metabolite levels, chemicals with at least one carbon-chlorine bond and a marked propensity towards bio-accumulation, were found to be nearly four times higher in patients with Alzheimer’s disease than in controls, a finding that echoes mounting concern about the neurotoxic effects of long-term low-level exposure. Reproductive harm, including impaired sperm quality and increased risk of birth defects, has also been documented across multiple studies.

This health risk does not fall on those who profit from these products; it falls on the seasonal workers who apply them, often without adequate protective equipment or meaningful safety training. In the Global South, where international regulatory frameworks are weakest and enforcement patchiest, the problem is severe. An estimated 385 million cases of acute pesticide poisoning occur globally each year, affecting approximately 44% of the world’s agricultural workforce.

Even for those who never set foot on a farm, exposure is still a fact of life. Pesticide residues persist in food, enter waterways, and, as research now demonstrates, include PFAS-based herbicides and fungicides that contribute directly to the broader forever chemicals crisis. In the UK, the pesticide Flufenacet continues to be applied to millions of hectares of arable land each year, generating PFAS contamination that the Environment Agency is now scrambling to map and monitor.

What We Are Doing to the Rest of Life?

The evidence from wildlife populations now tells a story that is in many respects further advanced than the human health data; animals have been accumulating these exposures for longer and in less regulated conditions.

The picture from UK freshwater and marine ecosystems is especially concerning. PFAS have now been detected in every otter liver sampled across England and Wales, a finding with profound implications, since otters sit at the apex of the river food chain and absorb concentrated chemical burdens from the fish, amphibians, and crustaceans they eat.

Harbour seals and grey seals around the British coast show elevated levels of PFAS and flame-retardant chemicals; these compounds affect hormonal regulation and can be passed to offspring through maternal milk, compromising the reproductive viability of future generations. Marine fish species including herring, cod, and mackerel have been found to contain PFAS, as have the freshwater fish that populate many of Britain’s rivers and reservoirs, frequently in association with pharmaceutical residues, bisphenols, and pesticides.

Bisphenols in particular have been shown to disrupt endocrine function in fish, including altering sex determination, a phenomenon that has even been documented in rivers receiving treated effluent across the UK. Wildlife biology is being changed by human activity.

In our seas, the microplastics crisis has become an existential one for many species. A 2019 study examining marine mammals stranded around the British coastline found microplastics in every single animal tested. A 2025 study published in the Proceedings of the National Academy of Sciences established lethal dose thresholds for plastics ingestion across marine animal groups: for seabirds such as the Atlantic puffin, consuming less than three sugar cubes’ worth of plastic carries a 90% probability of death. One in twenty sea turtles studied in that research died directly from plastic ingestion. Seabirds are now being found to develop ‘plasticosis’ - a newly described condition in which plastic particles cause structural scarring of the stomach lining - and toxic pollutants, carried by the plastics, are transferring from mother birds to their eggs. Around the World, plastic debris causes the deaths of over a million seabirds each year.

Recently, monitors documented the demise of a pod of Orcas off the north coast of Scotland - evidence suggested that microplastics, and the endocrine disrupting chemicals they contain, played a major role.

The food web ensures no organism, including humans, is insulated from these harms. Microplastics ingested by zooplankton pass to the small fish that eat them, and upward to larger predators, concentrating at each step. In a 2025 review of over 500 fish species, more than two thirds had consumed plastic. Coral reefs, which support approximately a quarter of all marine biodiversity, show evidence of microplastic-induced gut blockages and reduced feeding. Microplastic particles have been found to interfere with phytoplankton growth and photosynthesis so threatening the base of the marine food chain.

The pollinators on which terrestrial food production depends are not spared either. The UK supports over 270 bee species and many are already in steep decline from habitat loss. Research has now confirmed that bees contain both PFAS and multiple pesticide residues, and that these can cause the death of whole colonies. The herbicide and insecticide compounds found in bee bodies include chemicals approved for continued use in the UK despite being linked to neurological disruption and reproductive failure in pollinating insects. Hedgehogs, who are insectivorous, have been found to carry persistent flame retardants and pesticide residues at levels capable of compromising their survival and fitness.

We share food webs, water systems, and air with the species whose bodies now function as involuntary monitors of our own contamination. Their decline is not a separate crisis.

A Crisis of Structural Inequality

The distribution of chemical harm in the UK (and globally) follows the contours of poverty, race, and class with striking consistency. UKHSA’s 2025 health inequalities report found that people in the most deprived areas of England experience higher levels of air pollution than less deprived and less ethnically diverse areas, and that this gap extends to radiation, chemical, and environmental hazards more broadly. Research from the University of York confirmed that deprivation-based inequality in air pollution emissions persists across every major source category: transport, domestic heating, industry, and power generation.

In London, 46% of the most deprived neighbourhoods exceed EU nitrogen dioxide limits, compared to just 2% of the least deprived. Regions with the poorest physical environments have 18% more deaths than expected compared to less environmentally deprived regions, a figure drawn from WHO Europe’s own analysis of UK data.

In the Global South, the situation is worse. Communities in low-income countries bear a grossly disproportionate share of chemical harm as a direct consequence of decisions made by wealthy nations and multinational corporations. Electronic waste from Europe and North America is shipped to informal recycling sites in Ghana, Nigeria, and Bangladesh, where workers, often children, are exposed to toxic metals and flame retardants without protection. Pesticides withdrawn from sale in the EU on safety grounds continue to be exported to countries with less stringent regulations. The chemical burden of affluent consumption is, in a very literal sense, exported to those least able to refuse it.

Regulatory decisions about which chemicals may be manufactured, used, and disposed of, and where, are political choices. So is the decision to underfund the Environment Agency, to leave drinking water standards on a voluntary rather than statutory footing, or to delay alignment with EU chemical regulation post-Brexit. These choices have consequences, and those consequences land hardest on people who already face the greatest health disadvantages.

What Needs to Change?

The evidence base is now substantial enough to demand action rather than further study. Several priorities emerge clearly from the literature and from recent UK policy discussions.

First, UK drinking water and food safety standards for PFAS must be placed on a statutory footing and tightened in line with EU and US standards. The current voluntary guidelines leave millions of people drinking water that may exceed safety limits applied elsewhere in the developed world.

Second, the UK should move toward class-based PFAS regulation - treating all PFAS as a group for the purposes of restriction rather than assessing each of the nearly 10,000 individual substances separately. This approach, advocated by the European Environment Agency, Chem Trust, and a coalition of UK environmental NGOs, is the only practically workable route to meaningful control.

Third, occupational protections for agricultural workers must be strengthened, with enforceable standards rather than voluntary guidance. This is particularly urgent for migrant and seasonal workers who currently have the least access to regulatory protection.

Fourth, the NHS, public health bodies, and clinicians need better data. The UK lags behind comparable European nations in large-scale human biomonitoring of chemical exposure. Without that data, the true scale of population-level harm cannot be assessed, and without that assessment, the political urgency for change is perpetually deferred.

For healthcare workers, the implications of this evidence are immediate and practical. Chemical toxicity should be considered in the differential diagnosis for a range of presentations - from unexplained cardiovascular events in younger patients, to reproductive difficulties, to neurological decline. The social and occupational history should ask about industrial proximity, agricultural work, and housing in former industrial areas. Addressing chemical pollution is, in the deepest sense, a matter of health equity and urgency.

Meanwhile, human activity - especially that of the multinational corporations and billionaires in their mad dash for profit and exploitation - is destroying the health and quality of life for all on this planet. It needs to stop.

Asclepius

Discussion about this post

Ready for more?