Air sanitization apparatus for sanitizing the air in an environment comprising: - a boxed frame provided with an internal chamber communicating with the external environment through at least one inlet and at least one outlet, - fan means which are arranged in said internal chamber and are designed to be operated in order to: suck the air to be sanitized from the environment through the inlet, convey the air to be sanitized through the internal chamber along a sanitizing path, and supplying the sanitized air into the environment through the outlet, - a first filtering device, which is arranged in said internal chamber upstream of the fan means along said sanitizing path, - a second filtering device, which is arranged in said internal chamber downstream of said fan means along said sanitization path, - a first non-thermal plasma generator ionizer device, which is designed to generate an NTP mixture in said internal chamber between the second filtering device and said outlet, and characterised in that, it further comprises: - a second non-thermal plasma generator ionizer device which is arranged in said internal chamber between the first filtering device and the second filtering device and is designed to generate an NTP mixture between them, - an electronic control unit, which is configured to implement a filter sanitization process, wherein it controls the second non-thermal plasma generator ionizer device to generate a first predetermined quantity of NTP mixture in the internal chamber in correspondence to at least the second filtering device to sanitize it, wherein during the implementation of said filter sanitization process, said electronic control unit is configured to selectively command: the switching off of said fan means in order to interrupt the flow of air passing through said filtering device and second filtering device in said internal chamber, the switching on of the second non-thermal plasma generator ionizer device for a predetermined time interval in order to generate said first predetermined quantity of NTP mixture. - a boxed frame provided with an internal chamber communicating with the external environment through at least one inlet and at least one outlet, - fan means which are arranged in said internal chamber and are designed to be operated in order to: suck the air to be sanitized from the environment through the inlet, convey the air to be sanitized through the internal chamber along a sanitizing path, and supplying the sanitized air into the environment through the outlet, - a first filtering device, which is arranged in said internal chamber upstream of the fan means along said sanitizing path, - a second filtering device, which is arranged in said internal chamber downstream of said fan means along said sanitization path, - a first non-thermal plasma generator ionizer device, which is designed to generate an NTP mixture in said internal chamber between the second filtering device and said outlet, and characterised in that, - a second non-thermal plasma generator ionizer device which is arranged in said internal chamber between the first filtering device and the second filtering device and is designed to generate an NTP mixture between them, - an electronic control unit, which is configured to implement a filter sanitization process, wherein it controls the second non-thermal plasma generator ionizer device to generate a first predetermined quantity of NTP mixture in the internal chamber in correspondence to at least the second filtering device to sanitize it, wherein during the implementation of said filter sanitization process, said electronic control unit is configured to selectively command: the switching off of said fan means in order to interrupt the flow of air passing through said filtering device and second filtering device in said internal chamber, the switching on of the second non-thermal plasma generator ionizer device for a predetermined time interval in order to generate said first predetermined quantity of NTP mixture. the switching off of said fan means in order to interrupt the flow of air passing through said filtering device and second filtering device in said internal chamber, the switching on of the second non-thermal plasma generator ionizer device for a predetermined time interval in order to generate said first predetermined quantity of NTP mixture.