a main body comprising at least one gas inlet and at least one gas outlet, wherein the main body is a directional gas-guiding device fixedly combined with an exercise equipment in the exercise environment, wherein a directional guiding element is disposed in the at least one gas outlet of the main body, so that the purified gas is directionally filtered by the purification unit and discharged from the at least one outlet;

a purification unit disposed in the main body for purifying a gas introduced into the main body through the at least one gas inlet;

a gas guider disposed in the main body and adjacent to the at least one gas outlet, wherein the gas outside the main body is inhaled and flows through the purification unit for filtering and purifying, so that a purified gas is filtered and discharged out through the at least one outlet; and

a gas detection module disposed in the main body for detecting a particle concentration of suspended particle contained in the purified gas filtered by the purification unit,

wherein the gas guider is constantly controlled to operate and export the gas at an airflow rate within 3 minutes to reduce the particle concentration of the suspended particles contained in the purified gas to less than 0.75 μg/m³, so as to provide the purified gas through safe filtration to an exerciser for breathing in the exercise environment.