Engineering controls seek to decrease hazards by creating barriers to hazard exposure. Qualitative risk analysis is a technique used to quantify risk associated with a particular hazard. Critics charge that strict liability creates risk of moral hazard. Therefore, it poses as a serious safety hazard. They can be classified as type of occupational hazard or environmental hazard. Radon gas is considered a health hazard. All activities inducing a potential fire hazard should be avoided. Occupational exposure limits exist in many countries recognizing the hazard of wood dusts. Adverse selection is related to the concept of moral hazard. Ice forming on roads is a dangerous winter hazard. Traffic accidents are a major hazard in Bangkok. An oil spill represents an immediate fire hazard. P-benzoquinone is listed as being a very toxic, acute environmental hazard. The sanity meter decreases when Alice sustains damage from enemy attacks or an environmental hazard. Asphyxiation is another potential work hazard in certain situations.