Consumption of fruit and vegetables might mitigate the adverse effects of ambient PM on lung function among adults.

BACKGROUND

Evidence on the effects of ambient PM on lung function is limited among adults and the effect modification by dietary fruit and vegetables remains largely unknown.

METHODS

We interviewed 29,032 participants aged 50 years and older from the WHO Study on global AGEing and adult health. Annual average PM levels were estimated for each community using satellite data. We applied multi-level linear regressions to examine the association between ambient PM and lung function (forced vital capacity (FVC), forced expiratory volume in 1-sec (FEV), FEV/FVC ratio, peak expiratory flow (PEF), and forced expiratory flow between 25th and 75th percentiles of FVC (FEF)).

RESULTS

We found that ambient PM was associated with lower lung functions. Each 10μg/m increase in PM corresponded to reductions of 123.58ml in FVC (95% CI: -185.21, -61.95), 126.64ml in FEV (95% CI: -186.04, -67.23) and 178.93ml/s FEV (95% CI: -249.20, -108.66). Lower effect estimates were observed among those with higher consumption of fruit and vegetables.

CONCLUSION

Our study suggests that exposure to ambient PM might be one risk factor of reduced lung function in adults and that higher consumption of fruit and vegetables may mitigate this effect.