In the terms of damage caused to the environment, air pollution can be easily characterized as the main culprit .The main sources of air pollution are industries. Therefore, this paper aims at using semi-conductor sensor for detecting the various pollutant gases at the emission outlets which detects the level of pollutants in the industries. Specifically in this paper, gas sensor MQ135 is used. When the pollution/emission level shoots beyond the permissible level, the process/machinery causing the polluted emission is immediately shut down and there will be an alarm (light alarm or buzzer) to indicate that the limit has been reached at a specific emission outlet. Simultaneously, the factory control room will be informed via GSM that the process/ machinery has been shut down and corrective action has to be taken. The execution and synchronization of the entire process is monitored and controlled by a microcontroller (PIC16F877A).
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