The invention relates to a method providing a diffusion procedure where diffusion is controlled in order to confer a diffusion desired for the composition, and, before the execution of the diffusion procedure, a previous procedure of treatment of the air of the environment occurs. The previous treatment procedure measures at least one physico-chemical parameter of said air; compares the measured parameter to a threshold; and, if the threshold is exceeded by the measured parameter, activates a device for treatment of the air that is arranged in order to modify the parameter in compliance with the threshold.

An air purification-aromatherapy machine includes a housing, an aromatherapy assembly, a filter screen, and an air extractor; the housing is provided with an air inlet and an air outlet; the aromatherapy assembly, the filter screen and the air extractor are placed in the housing; the air extractor comprises a fan, an air duct configured for guiding an airflow blown by the fan to the air outlet, and a sound absorber configured for absorbing noise of the airflow; an end of the air duct is extended to the air outlet, the sound absorber is placed in the air duct and corresponding to the air outlet.

A Heating, Ventilation, And Air-Conditioning (HVAC) system comprises a volatile organic compound (VOC) sensor configured at a first position. HVAC system also includes a particulate matter (PM) sensor configured at a second position next to or away from the VOC sensor. Further, the HVAC system includes a smart meter unit (SMU) coupled to the VOC sensor and PM Sensor, wherein the SMU is configured to read data from the VOC sensor and PM sensor. The SMU makes a decision with regard to a ventilation portion of a heating or cooling system based on the data read from the VOC sensor and PM sensor. The HVAC system also includes a fan detection sensor coupled to the SMU, and configured to determine whether a fan is in an on or off position.

A Heating, Ventilation, And Air-Conditioning (HVAC) system comprises a volatile organic compound (VOC) sensor configured at a first position. HVAC system also includes a particulate matter (PM) sensor configured at a second position next to or away from the VOC sensor. Further, the HVAC system includes a smart meter unit (SMU) coupled to the VOC sensor and PM Sensor, wherein the SMU is configured to read data from the VOC sensor and PM sensor. The SMU makes a decision with regard to a ventilation portion of a heating or cooling system based on the data read from the VOC sensor and PM sensor. The HVAC system also includes a fan detection sensor coupled to the SMU, and configured to determine whether a fan is in an on or off position.

A system for controlling an environment to enhance circadian rhythm includes a control system associated with a building, and a plurality of sensors and environment enhancing devices placed within the building. Based on data transmitted by the sensors to the control system, the control system activates the environment enhancing devices to improve circadian rhythms of a resident.

A method for managing an air quality control system is disclosed. The method includes monitoring air quality changes in an environment caused by a deployment of units, estimating individual rates of change of air quality achieved by specific units, and using the estimated rates of change to train a prediction model. The method further includes receiving a request for air quality control of a specified environment, using the trained prediction model to predict unit rates of change that would be achieved by units if deployed within the specified environment and generating an assignment of units for the specified environment on the basis of the predicted unit rates of change and a target air quality parameter.

A scent adjustment system includes a scent emitter arranged to supply a scent material to a target space, a storage, and a controller. The storage stores sensory information in which an intensity of a smell of the scent material perceived by a person and a concentration of the scent material are associated with each other. The controller adjusts the concentration of the scent material supplied from the scent emitter based on the sensory information stored in the storage.

A personal air treatment device is used to treat air with UV irradiation and with scents. The scents may be used as an attractant or masking for hunting. Multiple devices may be controlled by a smartphone application to strategically alter scent dispersion according to local wind patterns, user location, and relative device location. Similar air treatment devices may be integrated with a particulate mask or used to otherwise treat the air around a user.

An air purge method in a vehicle is provided. The air purge method comprises starting a vehicle ventilation device in response to ventilation instruction; determining a current air purge status based on an operation time of the ventilation device; and indicating the current air purge status via an air purge indication device.

Environmental characteristics of habitable environments (e.g., hotel or motel rooms, spas, resorts, cruise boat cabins, offices, hospitals and/or homes, apartments or residences) are controlled to eliminate, reduce or ameliorate adverse or harmful aspects and introduce, increase or enhance beneficial aspects in order to improve a wellness or sense of wellbeing provided via the environments. Control of intensity and wavelength distribution of passive and active Illumination addresses various issues, symptoms or syndromes, for instance to maintain a circadian rhythm or cycle, adjust for jet lag or season affective disorder, etc. Air quality and attributes are controlled. Scent(s) may be dispersed. Hypoallergenic items (e.g., bedding, linens) may be used. Water quality is controlled. Noise is reduced and sounds (e.g., masking, music, natural) may be provided. Passive and active pathogen controls are employed. Controls are provided for the occupant and/or facility personnel, as is instruction, and surveys, including assessing wellness.