From 2a481c15004cd6f56e4e6ec8169d1747c608006b Mon Sep 17 00:00:00 2001
From: Nicolas Mounet <nicolas.mounet@cern.ch>
Date: Thu, 15 Dec 2022 17:03:12 +0100
Subject: [PATCH] Correcting bug in models._ConcentrationModelBase (wrong value
 of concentration_limit when no one is present, for non-zero atmospheric
 concentration)

---
 caimira/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/caimira/models.py b/caimira/models.py
index 83711bfd..43cab84f 100644
--- a/caimira/models.py
+++ b/caimira/models.py
@@ -1001,7 +1001,7 @@ class _ConcentrationModelBase:
         dependence has been solved for.
         """
         if not self.population.person_present(time):
-            return 0.
+            return self.atmosphere_concentration()/self.normalization_factor()
         V = self.room.volume
         RR = self.removal_rate(time)