This seems to be the field which is "Air Pressure Sensor Data Description" in a similar section of EM Version Release 3-23MAR15.pdf, which is the spec for the AIS 8:367:33 message.
I don't know whether this is a typo or not, but it could be clearer to the user what it is.
I noticed the following name in the code for AIS8_1_26_SENSOR_WX:
DictSafeSetItem(rpt_dict, "air_pressor_type", rpt->air_pressor_type);
This seems to be the field which is "Air Pressure Sensor Data Description" in a similar section of EM Version Release 3-23MAR15.pdf, which is the spec for the AIS 8:367:33 message.
I don't know whether this is a typo or not, but it could be clearer to the user what it is.