The paper is concerned with the development of the millimeter wave complex, intended for environmental control. To organize a reliable system for control and monitoring of the atmosphere one needs an adequate set of the measurement methods and devices for carrying out the needed measurements. At best, the devices must be capable of the remote sensing of the atmosphere in the continuous mode and should have proper means for communication with the central data acquisition system. The most informative methods for the atmospheric measurements are based on the microwave remote sensing. Particularly, using a 5-millimeter receiver (radiometer) it is possible to measure temperature vs. height dependence up to 1 km with required for temperature and height resolutions. Besides, a 3-millimeter coherent radar can be used for measuring the amount of condensed water (fog, rain, clouds) and smoke. Such hydrometers and other small particles support a dissipation of pollution from the accident to the distant areas. Besides, the radar allows us to measure the speed and direction of wind, which is very important for prediction of the danger for the other areas. So, the microwave complex, consisting of a 5-mm radiometer and a 3-mm coherent radar enables us to obtain needed information about the atmosphere state and to predict situation after the accident took place.