When I was working in HTML I found some strange characters like  appearing in my output. Then after searching on internet, I found out the proper solution which I am sharing with you.
Go to your file, in head you will find
<meta http-equiv=”Content-Type” content=”text/html; charset=iso-8859-1″ />
Replace it by following
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
And save the file again….
Now your output will be free from those characters.