The invisible architecture of our environments: Chemical exposure and the nervous system
The spaces we inhabit are often filled with an invisible architecture of chemical compounds that we interact with daily through our cosmetics, cleaning supplies, and general household items. While we often focus on the functional benefits of these products, such as their ability to sanitize a surface or enhance our physical appearance, it is increasingly important to consider how these substances interact with our complex biological systems. The nervous system is a particularly sensitive recipient of environmental input, and emerging research suggests that the accumulation of everyday chemical exposure may play a significant role in neurological health and sensory processing.
Modern household and personal care products frequently contain endocrine-disrupting chemicals (EDCs) and volatile organic compounds (VOCs) that can cross biological barriers and interact with neural pathways. Phthalates, often used as plasticizers or fragrance stabilizers in cosmetics and cleaning tools, have been identified as substances that can interfere with hormonal signaling necessary for brain development and maintenance (EPA, 2021). These chemicals do not merely sit on the surface of the skin; they are absorbed into the bloodstream and can potentially impact the delicate balance of neurotransmitters that regulate our moods and sensory thresholds. Meta-analyses have shown a correlation between high levels of exposure to certain EDCs and an increased risk for neurodevelopmental conditions, such as ADHD and autism, as well as neurodegenerative diseases like Parkinson’s (Aravindan et al., 2024).
For individuals who already navigate the world with a heightened sensitivity to sensory input, such as those with misophonia or sensory processing sensitivity, the presence of these chemicals may introduce an additional layer of physiological stress. The nervous system interprets environmental toxins not just as foreign substances, but as stressors that require a biological response. When we are constantly exposed to synthetic fragrances or harsh cleaning agents, our bodies may remain in a state of low-level chronic activation (Kulcsárová et al., 2025). This chronic activation can lower our threshold for other stressors, making us more reactive to the sounds, sights, and touches that already challenge us. In this sense, the chemical makeup of our homes is not separate from our mental health; rather, it is a foundational component of the environment that our nervous systems must constantly manage.
Beyond individual reactivity, there is the broader concern of systemic inflammation triggered by environmental toxicants. Particles from cleaning sprays or off-gassing furniture can enter the central nervous system through the olfactory system or the lungs, potentially triggering microglial activation—the brain’s immune response (ScienceDaily, 2026). When the brain’s immune cells are perpetually “on guard” due to chemical exposure, it can lead to oxidative stress and neuroinflammation, which are linked to various psychological and neurological difficulties. This suggests that our interaction with common household chemicals is not just a matter of hygiene or aesthetics, but a significant factor in our long-term cognitive and emotional resilience.
Choosing to reduce our chemical load is an act of environmental advocacy for our own biology. By opting for fragrance-free products, choosing simpler cleaning agents, and being mindful of the ingredients in our personal care routines, we are effectively lowering the “noise” our nervous systems must filter out. This approach aligns with the idea that managing our health requires a holistic view of our surroundings. If we accept that our brains are deeply connected to the environments we build, then creating a low-toxin home becomes a vital strategy for supporting a balanced and healthy nervous system.
References
Aravindan, A., Newell, M. E., & Halden, R. U. (2024). Literature review and meta-analysis of environmental toxins associated with increased risk of parkinson’s disease. The Science of the Total Environment, 931, 172838.
Environmental Protection Agency (EPA). (2021). Research on the effects on neurological development by endocrine disrupting chemicals. EPA snapshot report.
Kulcsárová, K., Piel, J. H. A., & Schaeffer, E. (2025). Environmental toxins in neurodegeneration: A narrative review. PMC Neurology and Neurosciences.
ScienceDaily. (2026). For the first time, scientists pinpoint the brain cells behind depression. McGill University report via ScienceDaily.
