diff --git a/script/pollution.py b/script/pollution.py
index ad99fde..c88c4ba 100755
--- a/script/pollution.py
+++ b/script/pollution.py
@@ -61,7 +61,7 @@ def single_monitoring(name, vcf, bed, freq_range, output_dir):
         count_exception=count_exception,
         z_score=z_score
     )
-    pd.DataFrame([res]).to_csv(os.path.join(f'{name}_pollution.csv'), sep="\t", index=False)
+    pd.DataFrame([res]).to_csv(os.path.join(output_dir, f'{name}_pollution.csv'), sep="\t", index=False)
 
 
 # 根据小bed筛选vcf