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Table 3 Pearson correlations between pollutants

From: Intracranial tumors of the central nervous system and air pollution – a nationwide case-control study from Denmark

  10 year mean BC (μg/m3) 10 year mean PM2.5 (μg/m3) 10 year mean NOX (μg/m3) 10 year mean NO2 (μg/m3) 10 year mean O3 (μg/m3)
Air pollutants
10 year mean O3 (μg/m3) −0.85 −0.62 −0.88 −0.98 1.00
10 year mean NO2 (μg/m3) 0.88 0.57 0.92 1.00  
10 year mean NOX (μg/m3) 0.94 0.55 1.00   
10 year mean PM2.5 (μg/m3) 0.54 1.00    
10 year mean BC (μg/m3) 1.00     
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