diff --git a/caimira/src/caimira/calculator/models/monte_carlo/models.py b/caimira/src/caimira/calculator/models/monte_carlo/models.py
index 9ee1d481..1c7c4a6e 100644
--- a/caimira/src/caimira/calculator/models/monte_carlo/models.py
+++ b/caimira/src/caimira/calculator/models/monte_carlo/models.py
@@ -129,8 +129,8 @@ _MODEL_CLASSES = [
 
 # Inject the runtime generated MC types into this module.
 for _model in _MODEL_CLASSES:
-    setattr(sys.modules[__name__], _model.__name__, _build_mc_model(_model))
+    setattr(sys.modules[__name__], _model.__name__, _build_mc_model(_model)) # type: ignore
 
 
 # Make sure that each of the models is imported if you do a ``import *``.
-__all__ = [_model.__name__ for _model in _MODEL_CLASSES] + ["MCModelBase"]
+__all__ = [_model.__name__ for _model in _MODEL_CLASSES] + ["MCModelBase"] # type: ignore
diff --git a/caimira/src/caimira/calculator/validators/co2/co2_validator.py b/caimira/src/caimira/calculator/validators/co2/co2_validator.py
index f2d56ad1..43ea6b7a 100644
--- a/caimira/src/caimira/calculator/validators/co2/co2_validator.py
+++ b/caimira/src/caimira/calculator/validators/co2/co2_validator.py
@@ -147,7 +147,7 @@ class CO2FormData(FormData):
     def generate_ventilation_plot(self,
                                   ventilation_transition_times: typing.Optional[list] = None,
                                   occupancy_transition_times: typing.Optional[list] = None,
-                                  predictive_CO2: typing.Optional[list] = None) -> dict:
+                                  predictive_CO2: typing.Optional[list] = None):
             
             # Plot data (x-axis: times; y-axis: CO2 concentrations)
             times_values: list = self.CO2_data['times']