Residents are angry over the empty land at the rear of Mynachdy Road, Gabalfa, which is treated as a dumping ground and infested with rats.
The site, which was originally a coal yard, has been empty for years. Old tires, plastic bottles, glass bottles, domestic goods and food waste are all chucked over the metal gates, which are supposed to prevent such happenings.
Despite the rejection of a planning application to build six blocks of student accommodation on the site, residents remain unhappy.