PTSD for air quality

I am figuring out what mental health claim my husband should make. He had significant lung damage from burn pits that has affected his daily life and also I think mental health. He is definitely hyper vigilant and OCD and makes life choices because of what happened to him. Things like quitting a 6 figure job, leaving family vacation in the middle of the night, moving our family out of our home of 9 years into a rental all because of concerns about bad air. My question is would the damaging fumes and memories of them count as an in service stressor for ptsd, or should we pursue something else like anxiety?