PT  - JOURNAL ARTICLE
AU  - Hayes, Louise
AU  - Mejia-Arangure, Juan Manuel
AU  - Errington, Adam
AU  - Bramwell, Lindsay
AU  - Vega, Elizabeth
AU  - Nunez-Enriquez, Juan Carlos
AU  - Namdeo, Anil
AU  - Entwistle, Jane
AU  - Miquelajauregui, Yosune
AU  - Jaimes-Palomera, Mónica
AU  - Torres, Nancy
AU  - Rascón-Pacheco, R Alberto
AU  - Duarte-Rodríguez, David A
AU  - McNally, Richard
TI  - Relationship between air quality and asthma-related emergency hospital admissions in Mexico City 2017–2019
AID  - 10.1136/thorax-2022-219262
DP  - 2024 Jan 01
TA  - Thorax
PG  - 43--49
VI  - 79
IP  - 1
4099  - http://thorax.bmj.com/content/79/1/43.short
4100  - http://thorax.bmj.com/content/79/1/43.full
SO  - Thorax2024 Jan 01; 79
AB  - Background Previous studies found exposure to air pollution leads to exacerbations of asthma in paediatric and adult patients and increases asthma-related emergency hospital admissions (AREHA).Methods AREHAs and levels of air pollutants (PM10, PM2.5 and NO2) were obtained from Mexico City for the period 2017–2019. A time-series approach was used to explore the relationship between air pollutants and AREHA. Relative risks of AREHA were estimated using a negative binomial regression in young children (less than 5 years) and adults (greater than 18 years).Results There was a positive association between AREHA and PM10, PM2.5 and NO2 in adults, which remained after mutual adjustment for these pollutants. The relative risk (RR) of admission in adults increased by 3% (95% CI 1% to 4%) for a 10 µg/m3 increase in PM10, 1% (0.03% to 3%) for a 5 µg/m3 increase in PM2.5 and by 1% (0.06% to 2%) for a 5 µg/m3 increase in NO2. In contrast, in young children, AREHAs were negatively associated with PM10 after adjustment for NO2 (RR 0.97 (0.95 to 0.99) for a 10 µg/m3 and with NO2 after adjustment for PM10 and PM2.5 (RR 0.98 (0.96 to 0.99) and 0.97 (0.96 to 0.99), respectively, for a 5 µg/m3 increase in NO2). AREHAs in children were not associated with PM2.5 after adjustment for NO2.Conclusions Ambient air pollution, within the previous week, was associated with emergency hospital admissions for asthma to public hospitals in adults in Mexico City. The relationship in children was less consistent. Further work is needed to explore why differences between adults and children exist to inform appropriate interventions to benefit public health.Data are available upon reasonable request. Data are available from the authors on request.