No, the dust collected by car vacuums does not just disappear after you empty it out. When you use a car vacuum to clean your vehicle, the dust and debris are suctioned into a dustbin or collection bag inside the vacuum. When you empty the dustbin or replace the collection bag, the dust and debris are removed from the vacuum, but they don't magically disappear.
Once you empty the contents of the vacuum, the collected dust and debris are typically discarded into a trash receptacle or a suitable disposal method, depending on local regulations. In some cases, the collected waste might be recycled if possible, especially if the debris includes materials that can be reused or repurposed.
It's essential to dispose of the dust and debris responsibly, following proper waste management guidelines to avoid environmental pollution and maintain cleanliness. This applies not only to car vacuums but also to other types of vacuum cleaners used in homes or commercial settings.