Fig. 6From: Exposure to lead-free frangible firing emissions containing copper and ultrafine particulates leads to increased oxidative stress in firing range instructorsPositive correlations between 8 h TWA CO, Cu, and LDSA. A Correlation between 8 h TWA CO and LDSA, R2 = 0.836, p < 0.0001. B Correlation between 8 h TWA CO and Cu, R2 = 0.834, p < 0.0001. C Correlation between 8 h TWA Cu and LDSA, R2 = 0.989, p < 0.0001Back to article page