Fig. 2From: Black carbon content in airway macrophages is associated with increased severe exacerbations and worse COPD morbidity in SPIROMICSAn increase in indoor PM2.5 concentration is associated with an increase in AM black carbon levels. The chart shows the predicted levels of (A) black carbon area and (B) black carbon percent and their 95% confidence intervals, based on multivariable regression analysis of log-transformed AM black carbon on indoor PM2.5, adjusted by batch, age, race, income, BMI, and LABA/LAMA. The predicted values were exponentiated to show the AM black carbon in original unit-scaling in y-axisBack to article page