An exposure-indicating supplied air respirator system comprising: a head top comprising a visor , a position sensor secured to the head top, wherein the visor is configured to fit over at least a user's nose and mouth; a clean air supply source connected to the head top, wherein the clear air supply source is configured to supply clean air to the interior of the head top; an environmental beacon comprising an environmental sensor and a communication module , the environmental sensor being an air contaminant sensor; a portable personal communication hub wherein the personal communication hub can be carried by the user; wherein the position sensor detects whether the visor is in a closed position, in a partially open position or in an open position, and when the position sensor detects that the visor is in a partially open position, the position sensor detects to what measure the visor is open; wherein the personal communication hub receives information from either a communication module in the head top or directly from the position sensor indicating the position of visor including if applicable the measure to which the visor is open, and receives information from the environmental sensor concerning a level of air contaminant in an environment; and wherein the personal communication hub, in response to receiving an indication that the level of air contaminant in the environment exceeds a threshold contamination level and that the visor is in a partially open position or an open position and based on a threshold amount of time that the visor is open, said threshold amount of time being specified by the detected level of openness of the visor, is configured to generate an alert to indicate the level of the air contaminant is greater than the threshold contamination level, such that the threshold for the amount of a time the visor may be open without triggering an alarm is longer if the visor is in a partially open position as compared to the open position. a head top comprising a visor , a position sensor secured to the head top, wherein the visor is configured to fit over at least a user's nose and mouth; a clean air supply source connected to the head top, wherein the clear air supply source is configured to supply clean air to the interior of the head top; an environmental beacon comprising an environmental sensor and a communication module , the environmental sensor being an air contaminant sensor; a portable personal communication hub wherein the personal communication hub can be carried by the user; wherein the position sensor detects whether the visor is in a closed position, in a partially open position or in an open position, and when the position sensor detects that the visor is in a partially open position, the position sensor detects to what measure the visor is open; wherein the personal communication hub receives information from either a communication module in the head top or directly from the position sensor indicating the position of visor including if applicable the measure to which the visor is open, and receives information from the environmental sensor concerning a level of air contaminant in an environment; and wherein the personal communication hub, in response to receiving an indication that the level of air contaminant in the environment exceeds a threshold contamination level and that the visor is in a partially open position or an open position and based on a threshold amount of time that the visor is open, said threshold amount of time being specified by the detected level of openness of the visor, is configured to generate an alert to indicate the level of the air contaminant is greater than the threshold contamination level, such that the threshold for the amount of a time the visor may be open without triggering an alarm is longer if the visor is in a partially open position as compared to the open position. <EOS>