All junk shops and the premises thereof shall be so maintained as not to permit therein or thereon the accumulation of filthy rags, filthy or offensive bones or anything else, in such a manner that may be a nuisance or detriment to health. Every license issued by the City Council is upon condition that all junk dealers’ places of business shall be so constructed, maintained and conducted as to comply with health and sanitary regulations and requirements in force within the city.