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Related Concept Videos

Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

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Updated: Jun 26, 2026

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
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Weather-Specific Individual Exposure to Organic Contaminants in Fine Particulate Matter by Nontarget Screening and

Yujue Yang1,2,3, Guorui Liu1,3,4, Zhiyong Xie5

  • 1College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.

Environment & Health (Washington, D.C.)
|June 25, 2026
PubMed
Summary

Understanding air pollution exposure is key for health. This study found that organic contaminants in fine particle matter (PM2.5) pose the highest risk during sandstorm weather, highlighting the need to consider weather in air quality monitoring.

Keywords:
GC QTOF MShuman exposurenontarget screeningparticulate matterrisk assessment

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Toxicology

Background:

  • Assessing health risks from fine particle matter (PM2.5) requires understanding organic contaminant exposure.
  • Current knowledge gaps exist regarding individual airborne pollutant exposure under diverse weather conditions.

Purpose of the Study:

  • To comprehensively identify and quantify organic contaminants in PM2.5 under various weather scenarios.
  • To develop a risk assessment model integrating pollutant characteristics and exposure levels.
  • To identify high-priority organic pollutants based on weather-specific risks.

Main Methods:

  • Utilized portable exposure samplers to collect PM2.5 samples during hazy, precipitation, dusty, and calm weather.
  • Employed non-targeted screening (NTS) with gas chromatography-quadrupole time-of-flight mass spectrometry (GC-QTOF MS) for contaminant identification.
  • Developed and applied a persistence-bioaccumulation-toxicity (PBT) model combined with exposure data for risk assessment.

Main Results:

  • Over 500 organic compounds were identified and semi-quantified in PM2.5 samples.
  • Significant variations in organic contaminant occurrence and risk profiles were observed across different weather conditions.
  • The highest average risk index for organic contaminants was recorded during sandstorm weather.

Conclusions:

  • Weather significantly influences the type and health risk of organic contaminants in PM2.5.
  • Integrating weather scenarios into atmospheric monitoring is crucial for accurate risk assessment.
  • Findings support the development of targeted air pollution control strategies based on weather-dependent risks.