Related Experiment Video
Updated: Dec 26, 2025
05:18
Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
Published on: July 12, 2024
637
Ambient Particulate Matter Size Distributions Drive Regional and Global Variability in Particle Deposition in the
J K Kodros1, J Volckens2, S H Jathar2
1Department of Atmospheric Science Colorado State University Fort Collins CO USA.
Geohealth
|March 12, 2020
Summary
Regional differences in airborne particulate matter (PM) size distributions significantly alter how much PM2.5 deposits in the human respiratory system. This variability in particle deposition may explain differing health outcomes from PM2.5 exposure.
Area of Science:
- Environmental Health Sciences
- Atmospheric Chemistry and Physics
- Toxicology
Background:
- Exposure to airborne particulate matter (PM) is linked to adverse health effects, but quantifying these risks is challenging.
- Current exposure-response relationships for PM2.5 often overlook variations in particle size distribution and respiratory deposition.
Purpose of the Study:
- To estimate how variations in ambient PM size distributions affect particle deposition across the respiratory tract.
- To quantify the regional variability in PM deposition ratios.
Main Methods:
- Integrated a size-resolved respiratory particle deposition model with a global size-resolved aerosol model.
- Assessed deposition ratios (DRTB+AV) for PM2.5 across different populated regions.
Main Results:
- Regional variations in PM size distributions cause 20-30% variability in deposited PM mass per unit PM2.5 exposure.
- Deposition ratios varied up to fourfold between regions like the Eastern US (fossil-fuel dominated) and North Africa (desert-dust dominated).
- Variability in deposition ratios persisted even when considering specific PM species and differed significantly based on mass, number, or surface area.
Conclusions:
- Regional differences in aerosol size distributions are a key driver of variability in PM deposition within the human respiratory system.
- This deposition variability may contribute to observed differences in health responses to PM2.5 exposure across populations.
Related Concept Videos
01:19Factors Affecting Pulmonary Ventilation
2.6K
Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
2.6K
01:23Inhaled Medications
638
Inhaled medications are crucial for managing chronic obstructive pulmonary disease (COPD) and asthma. They are essential for effective treatment and control, ensuring optimal respiratory health and well-being. Inhaled medication delivers drugs directly to the lungs, providing a rapid onset of action and reducing systemic side effects compared to oral or injectable medications. Three primary types of inhalation devices are used to administer these medications: nebulizers, metered-dose inhalers...
638
01:16Precipitate Formation and Particle Size Control
4.9K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
4.9K
01:20Chronic Obstructive Pulmonary Disease-II: Pathophysiology
4.1K
Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Inflammation
4.1K
01:31Anatomy of Respiratory System II: Lower Respiratory Tract
3.0K
The lower respiratory tract is anatomically composed of several vital structures, including the larynx, trachea, bronchial tree, alveoli, lungs, and pleurae. Each component has a specific function, and all are intricately connected to ensure efficient respiration.
The Larynx
It is located between the pharynx and the trachea, acts as a passageway for air, and hosts several critical structures, such as the epiglottis, vocal cords, and glottis. The epiglottis acts as a gateway, guiding food to the...
The Larynx
It is located between the pharynx and the trachea, acts as a passageway for air, and hosts several critical structures, such as the epiglottis, vocal cords, and glottis. The epiglottis acts as a gateway, guiding food to the...
3.0K
01:26Alveoli and Alveolar Ducts
5.1K
The respiratory zone of the human body, which stands in contrast to the conducting zone, comprises the structures that actively participate in the exchange of gases. The initiation of this zone is marked by the terminal bronchioles converging into respiratory bronchioles, the tiniest bronchiole classification. The respiratory bronchioles give way to the alveolar ducts that opens into a congregation of alveoli. Actively involved in gas exchange, alveoli resemble tiny sacs similar to clusters of...
5.1K