How does Bohr's model explain the stability of an atom?

According to Bohr’s model of an atom, electrons in an atom can revolve in certain definite energy levels called stationary states. As long as electron remains in a particular permitted circular orbit (or stationary state), it neither emits nor absorbs energy. In other words, an electron can not spiral towards the nucleus by losing energy continuously. The only way by which an electron can lose energy is to jump from higher energy levels to lower ones. It is obvious that the electron can not radiate energy if no lower energy level is available. That is why atoms do not collapse.