Fig. 4
From: The association of exhaled nitric oxide with air pollutants in young infants of asthmatic mothers
Seven-day mean air pollutants on the day of the infant’s clinical assessment, plotted by month of test through the duration of the study, with cosine regression line overlayed. CO: carbon monoxide; cos: cosine; NH3: ammonia; NO: nitric oxide; NO2: nitrogen dioxide; O3: ozone; PM10: particulate matter less than 10μm; PM2.5: particulate matter less than 2.5μm; reg: regression line; SO2: sulfur dioxide