Particulate polluting of the environment is often a mix of solid and liquid particles which are suspended up that you breathe. It is best to classify air particles from the aerodynamic properties as these properties determine the removal of them through the air, and where they deposit within your breathing. The body builders and the athletes take these steroids through injections to gain energy and strength. However, you should be aware that while taking the injections you must inject the syringe into the muscle as opposed to blood veins and the syringes have to be new and free of every one of the infections. The users need to take some precautions so as to keep you resistant to any future damage. Xanax is in a class of medications called benzodiazepines. Benzodiazepines, or "Benzos" because the in-crowd calls them were developed for essentially the most part to calm people down during times of stress. They are also employed to control seizures sometimes and so are often employed to help alcoholics taper off the booze.