Chemical and Biological Weapons Opposition Day, Tir 8. This day is marked in the Jalali calendar to highlight the dangers and consequences of using chemical and biological weapons. During the Iran-Iraq war, the use of such weapons caused widespread human and environmental harm, with thousands of civilians and military personnel injured or killed. Today, the observance serves to raise public awareness about the impact of chemical and biological weapons and the importance of efforts to prevent their production and use. Educational events and commemorations are held to emphasize adherence to international regulations and support for victims of these weapons. The day also provides an opportunity for discussions on preventing the proliferation of these weapons and fostering international cooperation in disarmament. Attention to the long-term effects on human health and the environment remains a central theme in related programs and activities.