Fig. 4From: The association between air pollution and the daily hospital visits for atrial fibrillation recorded by ECG: a case-crossover studyThe case-crossover study was used to explore the correlation of AF recorded by ECG with air pollution. A Shows the AF with PM2.5; B shows the AF with PM10; C shows the AF with O3; D shows the AF with SO2; E shows the AF with NO2; F shows the AF with CO. *p < 0.05; **p < 0.01Back to article page