Corrigendum to “The probable roles of valsartan in alleviating chronic obstructive pulmonary disease following co-exposure to cold stress and fine particulate matter” [Environ. Toxicol. Pharmacol. 60 (2018) 230–236]

•First time to evaluate the co-effects of cold stress and PM2.5 on rat model of COPD.•Evaluate the effects of valsartan in treating COPD rat following co-exposure to cold stress and PM2.5.•Cold stress and PM2.5 may aggravate the inflammatory and oxidative responses in COPD rats.•Valsartan may relieve the severe condition of COPD rats following co-exposure to cold stress and PM2.5.