diff --git a/hourlyEmssionRate.py b/hourlyEmssionRate.py
index a86c7d0..513ff09 100644
--- a/hourlyEmssionRate.py
+++ b/hourlyEmssionRate.py
@@ -20,6 +20,7 @@
 ##############################
 
 import pandas as pd
+import numpy as np
 import csv
 import numpy as np
 
@@ -141,4 +142,4 @@
 master['EF']= master['EF'].apply(lambda x: '%.13f' % x).values.tolist() #for decimal place
 
 fmt = '%0s %+1s %+1s %+2s %+2s %+2s %-1s %+13s'
-np.savetxt(path +'\\' + fileName, master.values, fmt=fmt)
\ No newline at end of file
+np.savetxt(path +'\\' + fileName, master.values, fmt=fmt)