# Association Between Air Pollutants and Infectious Epiglottitis Incidence: A Observational Study

## TL;DR

This study finds that higher levels of PM2.5 air pollution are linked to more cases of infectious epiglottitis in Shanghai.

## Contribution

The study identifies a novel association between PM2.5 and infectious epiglottitis incidence using hospital data and air quality metrics.

## Key findings

- PM2.5 levels showed a significant 4.1% increase in hospital visits for infectious epiglottitis per 10 μg/m³ rise.
- PM2.5 had a significant association with hospital visits at a 1-day lag (RR = 1.041).
- Other pollutants like SO2 and NO2 did not show significant associations with epiglottitis cases.

## Abstract

Infectious epiglottitis is inflammation of epiglottis and surrounding structures and may be life‐threatening without treatment. Air pollution is a critical risk factor for human health. This study aims to explore the correlation between infectious epiglottitis and air pollutants.

We collected the daily infectious epiglottitis cases in our hospital and the daily meteorological data, including average temperature, relative humidity, and the daily concentrations of air pollutants of Shanghai, China, from January, 2015 to December, 2019. Air pollutants include particulate matter (PM2.5 and PM10), sulfur dioxide (SO2) and nitrogen dioxide (NO2). Generalized additive Poisson regression models were applied to assess the association between the corresponding pollutants and hospital visits for infectious epiglottitis.

A total of 3280 infectious epiglottitis cases were identified with 1.80 hospital visits per day for all subjects. The mean daily concentrations of PM2.5, PM10, SO2, and NO2 were 39.7 μg/m3, 53.9 μg/m3,11.0 μg/m3, and 40.5 μg/m3, respectively. Spearman correlation analyses indicated a moderate to strong and positive correlation among air pollutants. There was a linear and increasing association between the daily concentration of PM2.5 and hospital visits (p < 0.01). The significant estimate was found in PM2.5 for 1‐day lag (RR = 1.041, 95% CI 1.003, 1.079). No significant association was observed among all lag days for other pollutants.

Particulate matter 2.5, SO2, and NO2 were significantly associated with infectious epiglottitis incidence in Shanghai. The estimated hospital visits were increased by 4.1% for a 10‐μg/m3 increase in PM2.5 for 1‐day lag.