pathway · Public research summary
Outdoor fine particles and airway inflammation
Fine particulate matter irritates and inflames airways and is linked to chronic respiratory disease and acute worsening episodes.
Educational only. Associations do not establish individual risk or diagnosis. Read the original sources and limitations.
Illustrative pathway
Outdoor PM2.5 → Airway inflammation → Chronic respiratory disease → Acute exacerbations
Relationship
Established causal link: Multiple lines of evidence, including experimental, converge.
Evidence and uncertainty
Systematic reviews & meta-analyses; low uncertainty.
Summary
Fine particulate matter irritates and inflames airways and is linked to chronic respiratory disease and acute worsening episodes.
Limitations
Personal exposure differs from monitor readings; indoor time, commuting and occupation shift real dose substantially.
Data status
Synthetic illustration only. Map widths are not patient counts, prevalence, study effect sizes or personal risks. A paper does not validate every arrow.
Regional browsing relevance
Global; South Asia; East Asia; Middle East & North Africa; Sub-Saharan Africa