Just use this rewrite rule in your htaccess file,
it will strip all query strings.
RewriteRule ^(.*) /$1? [R=301,L]
to allow more rules to follow use this instead
RewriteRule ^(.*) /$1? [R=301]
remove 301 like this
RewriteRule ^(.*) /$1? [NE,L]
and refer the correct url for search engines.
without 301 you will need to make a canonical link
pointing to the correct url.
if you are rewriting the URL for SEO then a better
way might be to block search engines from crawling
pages with querry strings by adding this to your
robots txt file.
Disallow: /site/city-page/?*
This rule presumes you site directory is e.g /site/city-page/
Hope this helps