Need help with computer science Why wont this javascript code execute

<!Doctype html> 

<html> 

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<title>JavaScript Tutorial</title> 

<body> 

<script language = "javascript"> 

var cleanCities = ["Cheyenne ","Santa Fe ","Tucson ","Great Falls ","Honolulu"]; 

var cityToCheck = "Tucson"; 

if(cityToCheck === cleanCities[i]) 

alert("You are clean"); 

</script> 

</body> 

</html> 

it looks logically and syntactically correct so im not sure what im missing.