The association between short-term exposure to ambient air pollution and fractional exhaled nitric oxide level: A systematic review and meta-analysis of panel studies

• Published in: Environmental pollution (1987) 2020-10, Vol.265 (Pt A), p.114833, Article 114833
• Main Authors: Chen, Xiaolu, Liu, Feifei, Niu, Zhiping, Mao, Shuyuan, Tang, Hong, Li, Na, Chen, Gongbo, Liu, Suyang, Lu, Yuanan, Xiang, Hao
• Format: Article
• Language: English
• Subjects: Air pollutants; Air Pollutants - analysis; Air Pollution - analysis; Airway inflammation; Environmental Exposure - analysis; Fractional exhaled nitric oxide; Nitric Oxide; Ozone - analysis; Panel study; Particulate Matter - analysis; Sulfur Dioxide - analysis
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2020.114833

Several epidemiological studies have evaluated the fractional exhaled nitric oxide (FeNO) of ambient air pollution but the results were controversial. We therefore conducted a systematic review and meta-analysis to investigate the associations between short-term exposure to air pollutants and FeNO level. We searched PubMed and Web of Science and included a total of 27 articles which focused on associations between ambient air pollutants (PM10, PM2.5, black carbon (BC), nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3)) exposure and the change of FeNO. Random effect model was used to calculate the percent change of FeNO in association with a 10 or 1 μg/m3 increase in air pollutants exposure concentrations. A 10 μg/m3 increase in short-term PM10, PM2.5, NO2, and SO2 exposure was associated with a 3.20% (95% confidence interval (95%CI): 1.11%, 5.29%), 2.25% (95%CI: 1.51%, 2.99%),4.90% (95%CI: 1.98%, 7.81%), and 8.28% (95%CI: 3.61%, 12.59%) change in FeNO, respectively. A 1 μg/m3 increase in short-term exposure to BC was associated with 3.42% (95%CI: 1.34%, 5.50%) change in FeNO. The association between short-term exposure to O3 and FeNO level was insignificant (P＞0.05). Future studies are warranted to investigate the effect of multiple pollutants, different sources and composition of air pollutants on airway inflammation. [Display omitted] •This meta-analysis investigated the association between air pollutants and FeNO.•High level of short-term exposure to PM and BC was associated with increased FeNO.•Short-term exposure to NO2 and SO2 was significant positively associated with FeNO.•The association between short-term exposure to O3 and FeNO was insignificant.