An improved, air cleaner is provided to eliminate the detriment caused by air pollution and cigarette smoke. The air cleaner includes a removable build-in ashtray which is mounted in front of the housing of the air cleaner. At smoking, the ashtray would be opened by removing its cover. When the ashtray is full of ash, it would be removed for emptying and cleaning. The air cleaner is provided with a disposable filter pack inserted into an open slot of the cleaner housing. The filter pack contains an active carbon layer and chemical catalyst and perfume therein.