An unmanned aerial vehicle may include a GPS configured to provide location coordinates for the unmanned aerial vehicle during flight and an ionization filter configured to trap radioactive particles. The unmanned aerial vehicle includes a radiation detector configured to measure radiation emitted from the trapped radioactive particles, and a memory device configured to store and associate the GPS coordinates and the measured radiation.

An unmanned aerial vehicle may include a GPS configured to provide location coordinates for the unmanned aerial vehicle during flight and an ionization filter configured to trap radioactive particles. The unmanned aerial vehicle includes a radiation detector configured to measure radiation emitted from the trapped radioactive particles, and a memory device configured to store and associate the GPS coordinates and the measured radiation.

An electrostatic-precipitator air cleaner includes a base, a shell, a fan, a barrel, a high-voltage discharge module, a distribution module and a precipitation module. The shell is connected to the base. The fan is connected to an upper portion of the shell. The barrel is connected to the shell above the base. The high-voltage discharge module is connected to the base and inserted in the barrel. The distribution module is connected to the high-voltage discharge module. The precipitation module is inserted in the barrel.

An air purifier having an electret module for capturing airborne particles, the electret module includes an electret element which generates a static field for capturing airborne particles. The electret module is positioned incorporated into the air purifier such that the static field helps prevent the inhalation of the airborne particles.

An air purifier having an electret module for capturing airborne particles, the electret module includes an electret element which generates a static field for capturing airborne particles. The electret module is positioned incorporated into the air purifier such that the static field helps prevent the inhalation of the airborne particles.

An air freshener is disclosed. The air freshener includes a body case defining the air freshener, the body case having a filter installation opening formed in one side thereof, a filter housing disposed in the body case, a drawer including a frame forming therein a drawer opening, through which air passes, and a filter cover coupled to the frame for covering the filter installation opening, and a filter module separably located on the frame for filtering the air that has passed through the drawer opening. The drawer is configured to be withdrawn from the inner space of the filter housing through the filter installation opening.

An air freshener is disclosed. The air freshener includes a body case defining the air freshener, the body case having a filter installation opening formed in one side thereof, a filter housing disposed in the body case, a drawer including a frame forming therein a drawer opening, through which air passes, and a filter cover coupled to the frame for covering the filter installation opening, and a filter module separably located on the frame for filtering the air that has passed through the drawer opening. The drawer is configured to be withdrawn from the inner space of the filter housing through the filter installation opening.

An apparatus for improving vehicle internal air may include an air conditioner including an intake door for controlling introduction of external air into a vehicle; an electric dust collection filter to collect fine dust contained in air; and a control device to control operation of the electric dust collection filter and the intake door, based on information about a concentration of fine dust inside the vehicle, a concentration of fine dust outside the vehicle, and a vehicle speed.

An apparatus for improving vehicle internal air may include an air conditioner including an intake door for controlling introduction of external air into a vehicle; an electric dust collection filter to collect fine dust contained in air; and a control device to control operation of the electric dust collection filter and the intake door, based on information about a concentration of fine dust inside the vehicle, a concentration of fine dust outside the vehicle, and a vehicle speed.

A gas purifying device is disclosed and comprises a gas purifier and a gas detector. The gas purifier comprises a purifier main body, a filter, an air guiding device and a drive control module. The purifier main body has an embedding slot. The gas detector is assembled in the embedding slot for or detached from the embedding slot for independently use. The gas detector comprises a gas detecting module, a particulate measuring module and a detector drive control module. The gas detecting module comprises a gas sensor and a gas actuator. The particulate measuring module comprises a particulate detector and a particulate actuator. The detector drive control module controls the actuation of the gas detecting module and the particulate measuring module and converts the monitored information from the gas detecting module and the particulate measuring module into a monitored data information, and outputs the monitored data information.