, ppm Headache, nausea, and dizziness after minutes of exposure. , ppm 몇 분 노출 후 두통, 메스꺼움, 현기증 몇 분 노출 후 쓰러지고 의식을 잃음. , ppm Headache and dizziness after one to two minutes unconsciousness and danger of death after minutes of exposure.