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Asthma-I: Introduction

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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...

Asthma I: Introduction

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Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...

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Asthma presents with a characteristic pattern of episodic respiratory symptoms that reflect underlying airway inflammation, bronchoconstriction, and mucus hypersecretion. Although severity varies among individuals, certain clinical manifestations are considered hallmarks of the disorder and often guide diagnosis and assessment.Respiratory SymptomsA persistent cough is one of the most common early features of asthma. It is frequently dry and tends to worsen at night or in the early morning,...

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Asthma-II: Pathophysiology and Classification

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Related Experiment Video

Updated: May 5, 2026

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

Published on: March 3, 2023

Exposure estimates for the Houston Area Asthma Study.

D J Kotchmar¹, T H Stock, A H Holguin

¹Environmental Criteria and Assessment Office, U.S. Environmental Protection Agency, 27711, Research Triangle Park, North Carolina, USA.

Environmental Monitoring and Assessment

|November 23, 2013

Summary

This summary is machine-generated.

This study details air pollutant exposure monitoring for the Houston Area Asthma Study. A three-tier approach provides individual exposure estimates to assess air pollution

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Area of Science:

Environmental Health
Epidemiology
Air Pollution Science

Background:

Asthma prevalence in the Houston area necessitates understanding air pollution's health effects.
Previous studies highlight the need for accurate individual exposure data in air pollution research.
The Texas Gulf Coast region faces significant air quality challenges.

Purpose of the Study:

To establish procedures for estimating air pollutant exposure in asthmatic populations.
To develop a comprehensive air monitoring network for individual exposure assessment.
To correlate air pollutant exposure with health effects in asthmatics.

Main Methods:

A three-tier monitoring scheme: fixed stations, indoor/outdoor residential monitoring, and personal monitoring.
Continuous monitoring of ozone, nitrogen oxides, sulfur dioxide, carbon monoxide, and meteorological parameters.
Integrated sampling for total suspended particulates (TSP), inhalable particulates (IP), aldehydes, and aeroallergens; personal monitoring for ozone, respirable particles, nitrogen dioxide, and formaldehyde.

Main Results:

Preliminary, unvalidated data on ozone monitoring for three participants were presented.
The monitoring network is designed to yield individual exposure estimates for health effect correlations.
Quality assurance and control programs were implemented according to EPA standards.

Conclusions:

The described monitoring procedures provide a framework for estimating individual air pollutant exposures.
The data generated will be used to explore relationships between air pollution and asthma.
Further analysis of validated data is required to establish definitive health effect correlations.