diff --git a/sumo_project/emissions.py b/sumo_project/emissions.py
index 5c11a41..d155679 100644
--- a/sumo_project/emissions.py
+++ b/sumo_project/emissions.py
@@ -143,11 +143,10 @@ def export_data_to_csv(config, grid):
         writer = csv.writer(f)
         # Write CSV headers
         writer.writerow(itertools.chain(('Step',), (a.name for a in grid)))
-        emissions = (a.emissions_by_step for a in grid)
-        step = 0
-        for em in emissions:
-            writer.writerow(itertools.chain((step,), (e.value() for e in em)))
-            step += 1
+        # Write all areas emission value for each step
+        for step in range(config.n_steps):
+            em_for_step = (f'{a.emissions_by_step[step].value():.3f}' for a in grid)
+            writer.writerow(itertools.chain((step,), em_for_step))
 
 
 def run(config, logger):