Fig. 2
The relationship between IAQI and AF number recorded by ECG. A, B and D–F Show the positive correlation between AF recorded by ECG and each of the detected air pollutants (PM2.5 r = 0.45 p < 0.05, PM10 r = 0.50 p < 0.05, SO2 r = 0.46 p < 0.05, NO2 r = 0.54 p < 0.05, and CO r = 0.38 p < 0.01). C Shows a negative correlation of O3 with daily visits (r = − 0.38, p < 0.05)