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Related Concept Videos

Asthma I: Introduction01:28

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-I: Introduction01:29

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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...
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Chronic Obstructive Pulmonary Disease I: Introduction01:23

Chronic Obstructive Pulmonary Disease I: Introduction

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Chronic obstructive pulmonary disease is a common, preventable, and treatable respiratory disorder characterized by persistent symptoms and progressive airflow limitation. This limitation results from a combination of small-airway disease (obstructive bronchiolitis) and parenchymal destruction (emphysema), both driven by chronic inflammation from exposure to harmful particles or gases.The disease includes two main pathological entities: emphysema, marked by destruction of alveolar walls and...
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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

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Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
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Microbiota of the Respiratory Tract01:29

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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more...
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Early-Life Ozone Exposure and Childhood Allergic Rhinitis: Critical Exposure Windows, Exposure-Response

Tianyi Chen1, Zhiping Niu1, Dan Norback2

  • 1Department of Environmental Health, School of Public Health, NHC Key Laboratory of Health Technology Assessment, Key Laboratory of Public Health Safety of the Ministry of Education, Fudan University, Shanghai 200032, China.

Environment & Health (Washington, D.C.)
|April 23, 2026
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Summary
This summary is machine-generated.

Ozone (O3) exposure during infancy (7.5-9.5 months) significantly increases childhood allergic rhinitis (AR) risk. This sensitive window is critical, especially for infants with less than six months of exclusive breastfeeding.

Keywords:
airway diseasesallergiesexposure–response curveozone exposure

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Area of Science:

  • Environmental Health
  • Pediatrics
  • Epidemiology

Background:

  • Childhood allergic rhinitis (AR) is a growing public health concern.
  • Previous studies suggest a link between ozone (O3) exposure and AR, but the specific sensitive exposure window (SEW) is not well-defined.

Purpose of the Study:

  • To identify the sensitive exposure window (SEW) for ozone (O3) exposure in relation to childhood allergic rhinitis (AR).
  • To characterize the exposure-response (E-R) relationship between O3 exposure and AR incidence.

Main Methods:

  • A multicenter survey involving 38,176 children aged 3-6 years across 7 Chinese cities (2019-2020).
  • Estimation of satellite-based individual maximum daily 8-hour average O3 exposure.
  • Statistical analysis to determine the SEW and E-R relationship, adjusting for PM2.5.

Main Results:

  • The prevalence of doctor-diagnosed AR was 11.9%.
  • The critical SEW for O3 exposure was identified as infancy, specifically 30-38 weeks postnatal (7.5-9.5 months).
  • An interquartile range (IQR) increase in O3 (10.1 μg/m3) was associated with an adjusted odds ratio of 1.29 (95% CI: 1.22-1.36) for AR, independent of PM2.5. The E-R relationship was nonlinear and threshold-free.

Conclusions:

  • Ozone (O3) exposure during infancy (7.5-9.5 months) significantly increases the risk of childhood allergic rhinitis (AR).
  • The heightened risk is particularly pronounced in southern regions and for children with less than six months of exclusive breastfeeding.
  • Findings highlight the critical role of early-life O3 exposure and breastfeeding duration in AR development.