Clean air is essential for our health and longevity. Air pollution is one of the greatest environmental issues of the world which threat health of live creatures. The aim of the present study is to assess the knowledge regarding air pollution among higher secondary school students. A simple descriptive design was used which is one of non experimental design. The data was collected by using cross sectional survey approach. The study was conducted in selected school Chaubeypur. Samples were selected using convenient sampling technique. The overall knowledge score was 9.28, mean 46% with SD 2.11 which shows that over all knowledge level was inadequate. There is no association found between knowledge level with their selected demographic variable.