In many schools, classrooms remain closed for long periods with limited ventilation, especially during extreme weather conditions. When a large number of students sit together in a confined space, the air quality inside the classroom gradually deteriorates. Fresh air circulation is reduced, and carbon dioxide levels increase due to continuous breathing in a crowded environment., This situation often leads to discomfort, tiredness, headaches, and reduced concentration among students. Many students may feel sleepy or less attentive during classes without realizing that poor air quality is one of the reasons. Dust from chalk, books, and classroom surfaces can also contribute to breathing discomfort., I have personally observed that in classrooms where windows and doors remain closed and many students are present, the environment feels suffocating and it becomes difficult to focus for long periods. This problem is usually unnoticed because it does not cause immediate visible harm, but it can affect learning efficiency and overall well-being over time., Since students spend several hours daily in classrooms, repeated exposure to such conditions can have a negative impact on their health and academic performance. Despite its importance, indoor air quality in classrooms is rarely discussed or monitored in schools.