diff --git a/AQIUtils.swift b/AQIUtils.swift
index eaf96a9..a81d580 100644
--- a/AQIUtils.swift
+++ b/AQIUtils.swift
@@ -14,7 +14,7 @@ class AQIUtils {
     
     case unknown = "Unknown"
     case pm2p5 = "PM2.5"
-    case pm10 = "PM 10"
+    case pm10 = "PM10"
     case co = "Carbon Monoxide"
     case so2 = "Sulfur Dioxide"
 
diff --git a/README.md b/README.md
index 0813a84..e46de73 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Swift class to convert pollutant concentration values to AQI
 
 ```swift
 debugPrint("concentration: 15.70 => \(AQIUtils.pm10_aqi(concentration: 15.70))")
-// "concentration: 15.70 => AQIResult(aqi: 15, category: Good, pollutant: PM 10)"
+// "concentration: 15.70 => AQIResult(aqi: 15, category: Good, pollutant: PM10)"
 ```
 
 ```swift