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Oxidative Stress Induced by Air Pollutants and Its Role in Testicular Dysfunction
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This review pulls together recent research showing that everyday air pollution—including particle pollution, chemical fumes, and even microplastics we breathe in—can damage sperm quality by triggering harmful "oxidative stress" (basically cellular damage) in the testicles. This matters because it may help explain why male fertility rates have been declining worldwide, though scientists still need more research to pin down exactly how much pollution exposure causes problems and what can be done to prevent it, like improving air quality or using protective antioxidants.
Male infertility is an increasing global health concern with multifactorial origins. Recent evidence highlights air pollution as a key environmental risk factor affecting male reproductive health. This review synthesises studies from 2020 to 2026 on how airborne pollutants including particulate matter, gaseous compounds, polycyclic aromatic hydrocarbons and microplastics induce oxidative stress and impair testicular function. Oxidative damage emerges as a central mechanism driving mitochondrial dysfunction, inflammation, antioxidant depletion and DNA damage. Epidemiological findings consistently link higher pollutant exposure to reduced sperm quality including count, motility, morphology and genetic integrity. Experimental studies further demonstrate disruption of the blood-testis barrier, apoptosis of germ cells, hormonal imbalance and impairment of the hypothalamic-pituitary-testicular axis. Despite strong mechanistic insights, gaps remain in dose-response relationships, pollutant interactions and long-term reproductive outcomes. This review emphasises the need for integrated strategies combining pollution control, clinical monitoring and antioxidant interventions to mitigate reproductive risks.
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Environmental pollutants and testicular toxicity in male reproductive health: Basic evidence and translational prospects — A narrative review
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Sperm counts have dropped by more than half over the past 50 years, and this review pulls together lab evidence showing everyday pollutants, microplastics, BPA-related chemicals in plastics, and air pollution, may be damaging the testicles directly, including microplastics that have actually been found in human testicular tissue. The research even identifies a specific window (70-90 days before sperm is made) when air pollution exposure seems most harmful, though most of this evidence comes from animal studies and cells in labs, so human trials are still needed to confirm these effects and guide prevention strategies.
Environmental determinants of male infertility: emerging threats and technological interventions
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This review examines how environmental contaminants, including microplastics, air pollution, heavy metals, and endocrine-disrupting chemicals, may contribute to declining male fertility. The study suggests these environmental toxins can impair sperm function through oxidative stress, hormonal imbalance, and inflammation, and highlights the need for integrating environmental exposure data into fertility assessments.
The Impact of Microplastics on Male Fertility
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Microplastics and nanoplastics accumulate in testicular tissue and disrupt spermatogenesis through oxidative stress, inflammation, endocrine disruption, and structural damage to reproductive cells, consistently impairing sperm quality in experimental models. With global plastic production accelerating alongside documented declines in semen quality, this review highlights microplastic exposure as a plausible environmental contributor to male infertility warranting urgent human study.
Microplastics and impaired male reproductive health—exploring biological pathways of harm: a narrative review
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This narrative review summarizes the evidence that microplastics may harm male reproductive health through oxidative stress, hormone disruption, inflammation, and direct damage to reproductive cells. While animal studies show concerning effects on sperm quality, testicular function, and fertility, human studies are still lacking. The review calls for urgent research on microplastic impacts on human male fertility and for policies to reduce microplastic exposure.
Microplastics and male reproductive toxicity: Research progress on injury pathways and regulatory mechanisms
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This review pulls together existing research showing that tiny plastic particles from our environment can build up in male reproductive organs, where they've been linked to lower sperm quality in humans. Studies in animals and cells suggest these plastics may sneak past the body's natural defenses in the testicles, causing cell damage, inflammation, and hormone disruption that harms sperm production. While more research is needed to confirm exactly how much risk this poses to human fertility, the findings add to growing concerns about everyday plastic exposure and reproductive health.
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