Ambient air pollution undermines chemosensory sensitivity - a global perspective

Area of Science:

• Environmental Health
• Sensory Science
• Toxicology

Background:

• Air pollution poses significant risks to human health.
• Chemosensory functions (smell and taste) are vital for quality of life and detecting environmental hazards.
• The impact of specific air pollutants on chemosensory sensitivity is not fully understood.

Purpose of the Study:

• To investigate the relationship between common air pollutants and human chemosensory sensitivity.
• To determine how factors like age, season, and medical conditions modify this relationship.
• To assess the global variability in chemosensory perception linked to air quality.

Main Methods:

• Utilized chemosensory sensitivity data (olfactory and trigeminal thresholds) from 711 participants across 10 global regions.
• Matched individual sensory data with atmospheric pollutant levels (PM2.5, PM10, O3, NO2, SO2, CO) using the EMAC model.
• Analyzed data for seasonal patterns, age-related effects, and interactions with medical conditions.

Main Results:

• Air pollution was found to negatively affect olfactory function.
• Negative effects were cumulative with aging and exacerbated during Autumn and Winter.
• Olfactory and trigeminal perception were disrupted by air pollution, with distinct patterns observed.
• Interactions between pollutant levels and their combined effect on predicting sensitivity were complex.

Conclusions:

• Air quality is a significant factor contributing to regional differences in chemosensory perception.
• The study highlights the need for a global perspective on air pollution's impact on chemosensory health.
• Further research is needed to understand the complex interplay of pollutants and sensory function.