diff --git a/aqi/__init__.py b/aqi/__init__.py
index 6737e59..2c48658 100644
--- a/aqi/__init__.py
+++ b/aqi/__init__.py
@@ -24,7 +24,7 @@ def to_iaqi(elem, cc, algo=ALGO_EPA):
 
     :param elem: pollutant constant
     :type elem: int
-    :param cc: pollutant contentration (µg/m³ or ppm)
+    :param cc: pollutant concentration (µg/m³ or ppm)
     :type cc: str
     :param algo: algorithm module canonical name
     :type algo: str
diff --git a/aqi/algos/base.py b/aqi/algos/base.py
index bbe087f..aca92c7 100644
--- a/aqi/algos/base.py
+++ b/aqi/algos/base.py
@@ -15,7 +15,7 @@ def iaqi(self, elem, cc):
 
         :param elem: pollutant constant
         :type elem: int
-        :param cc: pollutant contentration (µg/m³ or ppm)
+        :param cc: pollutant concentration (µg/m³ or ppm)
         :type cc: str
         """
         raise NotImplementedError
@@ -76,7 +76,7 @@ def iaqi(self, elem, cc):
         _cc = Decimal(cc).quantize(self.piecewise['prec'][elem],
                                    rounding=ROUND_DOWN)
 
-        # define breakpoints for this pollutant at this contentration
+        # define breakpoints for this pollutant at this concentration
         bps = self.piecewise['bp'][elem]
         bplo = None
         bphi = None