Eric William made a Gas Sensor Project that uses an Arduino to send out spoken words to a cheap transmitter that can send the current levels of the sensors direct to a radio. This is a very adaptable idea that could be used for many things, best of all the parts of the project are very affordable!
 “Using the Arduino I was able to easily measure the gas levels. Using the Talkie library I was able to then translate these values into true synthesized human voice (with NO special boards/modules) The transmitter accepts the voice output and directly transmits it out on 433mhz to ANY receiver. It is sending this as an AM transmission- but surprisingly any FM receiver such as scanners/handy talkie radio, ems radios etc have no trouble receiving the clear voice values.”