Predicting the Impact of Air Quality Index on Rheumatoid Arthritis Disease Activity

Area of Science:

• Environmental Health
• Rheumatology
• Epidemiology

Background:

• Rheumatoid arthritis (RA) is a chronic autoimmune disease affecting joints.
• Environmental factors, including air pollution, are increasingly recognized as potential contributors to RA pathogenesis and disease activity.
• Understanding the specific impact of air pollutants on RA disease activity is crucial for patient management and public health.

Purpose of the Study:

• To investigate the association between specific air pollutants and rheumatoid arthritis (RA) disease activity.
• To quantify the impact of air quality components on the Disease Activity Score 28 (DAS28) in RA patients.
• To explore the temporal relationship between air pollution exposure and RA disease flares.

Main Methods:

• Data collected from six air-monitoring stations in Kuwait and RA patient data from the Kuwait Registry for Rheumatic Diseases (KRRD).
• Analysis of pollutants including sulfur dioxide (SO₂), nitrogen dioxide (NO₂), ozone (O₃), particulate matter (PM₁₀), nitrogen oxide (NO), and carbon monoxide (CO).
• Utilized Vector Error Correction Model (VECM) and co-integration analysis to assess short- and long-term associations with DAS28 scores.

Main Results:

• Nitrogen dioxide (NO₂) and ozone (O₃) were identified as key air quality components significantly affecting DAS28 scores.
• NO₂ showed a two-month lag effect (p < 0.01), and O₃ demonstrated a three-month lag effect (p < 0.05) on increased RA disease activity.
• VECM analysis revealed a significant negative long-term cointegration with the Error Correction (EC1) term (-0.54, p < 0.001), indicating a strong association.

Conclusions:

• Elevated exposure to NO₂ and O₃ may exacerbate rheumatoid arthritis disease activity.
• Air quality management is essential for mitigating environmental influences on RA.
• Findings support public health interventions targeting air pollution to improve RA prognosis.