Seasonal exposure to NO2 and respiratory symptoms in preschool children

Related Experiment Video

Updated: Oct 13, 2026

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels
05:31

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels

Published on: August 7, 2017

K Mukala1, J Pekkanen, P Tiittanen

  • 1Unit of Environmental Epidemiology, National Public Health Institute Kuopio, Finland. kristiina.mukala@ktl.fi

Journal of Exposure Analysis and Environmental Epidemiology
|April 1, 1996
PubMed

Insights

Higher nitrogen dioxide (NO2) exposure in urban areas was linked to increased respiratory symptoms in preschool children. This study highlights the impact of traffic pollution on young children's health.

Area of Science:

  • Environmental Health
  • Pediatric Respiratory Health
  • Air Pollution Epidemiology

Background:

  • Nitrogen dioxide (NO2) is a common air pollutant primarily from traffic emissions.
  • Preschool children may be particularly vulnerable to the respiratory effects of air pollution.
  • Understanding the link between NO2 exposure and respiratory symptoms in young children is crucial for public health.

Purpose of the Study:

  • To investigate the association between personal NO2 exposure and respiratory symptoms in preschool children.
  • To compare NO2 exposure levels and respiratory symptom prevalence between central urban and suburban areas.
  • To determine if differences in NO2 exposure explain observed differences in respiratory symptoms.

Main Methods:

  • A longitudinal study of 172 preschool children (3-6 years) in Helsinki over 7-8 weeks in 1991.
  • Personal NO2 exposure was measured using passive samplers worn by children.
  • Parents recorded daily respiratory symptoms (e.g., stuffed nose, cough) in diaries.

Main Results:

  • Median personal NO2 exposure was 21 µg/m³, with significantly higher levels in the central area (27.4 µg/m³) vs. suburban (18.2 µg/m³).
  • Children in the central area reported significantly more days with stuffed nose (26% vs. 20%) and cough (18% vs. 15%).
  • A non-significant positive correlation was found between individual NO2 exposure and cough during spring.

Conclusions:

  • The higher prevalence of certain respiratory symptoms in the central urban area was partly attributable to increased NO2 exposure from traffic.
  • While NO2 exposure is a contributing factor, other environmental or individual factors may also influence respiratory health in children.
  • Findings underscore the importance of reducing traffic-related air pollution in urban environments to protect children's respiratory health.

More Related Videos

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber08:47

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

Published on: March 3, 2023

Real-World M3-BREATHE: Toward Multimodal Mobile Monitoring of Behaviour, Respiration, and Exposures for Treatment and Health Evaluation09:50

Real-World M3-BREATHE: Toward Multimodal Mobile Monitoring of Behaviour, Respiration, and Exposures for Treatment and Health Evaluation

Published on: June 5, 2026

Related Concept Videos

Asthma-I: Introduction01:29

Asthma-I: Introduction

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-III: Symptoms and Complications01:24

Asthma-III: Symptoms and Complications

Asthma, a common chronic respiratory condition, is classified considering the frequency and severity of symptoms alongside lung function impairment. Understanding this classification is essential for appropriate treatment and management. Here's a detailed look at the classification of asthma and its clinical features and complications:
Classification of Asthma
Respiratory Syncytial Virus Disease01:29

Respiratory Syncytial Virus Disease

Human respiratory syncytial virus (RSV) is a widespread pathogen that primarily targets infants and young children but also poses a serious health risk to elderly and immunocompromised individuals. Belonging to the Pneumoviridae family, RSV is a negative-sense, single-stranded RNA virus within the Pneumovirus genus. Its global health burden is significant, with millions of cases annually resulting in hospitalizations and mortality, particularly in resource-limited settings. Although most...
Asthma I: Introduction01:28

Asthma I: Introduction

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...
Asthma III: Clinical Manifestations01:13

Asthma III: Clinical Manifestations

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,...