Narrative:

Around noon; my personal carbon monoxide detector alarmed and went to 70 ppm. I noticed the battery level was low and thought it may be malfunctioning. I immediately changed the battery and the alarm continued at 70 ppm. I began to feel a little lightheaded; my mouth became dry and my heart rate increased. I looked at my apple watch heart monitor confirmed my increase in heart rate; peaking at 174 bpm. I immediately called the pilots to inform them and to make sure they were feeling ok. The pilots were ok. The flight attendant in the front of the aircraft felt fine. The other flight attendant who was right next to me said they were tired; and their head felt a little abnormal but it could be because they were on minimum rest but were overall ok. I referenced my carbon monoxide chart and made a determination that the levels were not high enough; but is above osha standards prohibiting worker exposure to more than 50 parts of co gas per million parts of air averaged during an 8-hour time period. The guests on board never brought to any crew members attention about feeling ill. The levels began to drop after 15-20 minutes and the alarm stopped but still remained in the 27-34 ppm. Upon initial descent; final; and landing in ZZZ; levels remained around 21 ppm. After the cabin doors were opened the levels continued to decrease. On the return flight; the ppm dissipated and were around 2 ppm upon landing in ZZZ1. Due to an increase in fume events; I have been equipped with my personal carbon monoxide detector for about six months and it never alarmed until now. I believe the problem originated from a malfunction in the cabin air system; due to the outside air passing through the engines before being sent to the cabin. It should be made mandatory that all air carrier aircraft be equipped with carbon monoxide detectors due to known issues with cabin air systems.

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Original NASA ASRS Text

Title: A319 Flight Attendant reported personal Carbon Monoxide monitor alarm activated due to excessively high levels of Carbon Monoxide resulting in cabin crew experiencing physiological symptoms.

Narrative: Around noon; my personal carbon monoxide detector alarmed and went to 70 ppm. I noticed the battery level was low and thought it may be malfunctioning. I immediately changed the battery and the alarm continued at 70 ppm. I began to feel a little lightheaded; my mouth became dry and my heart rate increased. I looked at my Apple Watch heart monitor confirmed my increase in heart rate; peaking at 174 bpm. I immediately called the pilots to inform them and to make sure they were feeling OK. The pilots were OK. The Flight Attendant in the front of the aircraft felt fine. The other Flight Attendant who was right next to me said they were tired; and their head felt a little abnormal but it could be because they were on minimum rest but were overall OK. I referenced my Carbon Monoxide chart and made a determination that the levels were not high enough; but is above OSHA standards prohibiting worker exposure to more than 50 parts of CO gas per million parts of air averaged during an 8-hour time period. The guests on board never brought to any crew members attention about feeling ill. The levels began to drop after 15-20 minutes and the alarm stopped but still remained in the 27-34 ppm. Upon initial descent; final; and landing in ZZZ; levels remained around 21 ppm. After the cabin doors were opened the levels continued to decrease. On the return flight; the ppm dissipated and were around 2 ppm upon landing in ZZZ1. Due to an increase in fume events; I have been equipped with my personal carbon monoxide detector for about six months and it never alarmed until now. I believe the problem originated from a malfunction in the cabin air system; due to the outside air passing through the engines before being sent to the cabin. It should be made mandatory that all air carrier aircraft be equipped with carbon monoxide detectors due to known issues with Cabin Air Systems.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.