Excise exemption for compressed air removes all duty leviable under the tariff classification specified in the schedule. Notification exempts compressed air within Chapter 28 or Chapter 38 from the whole excise duty specified in the Schedule to the Central Excise Tariff Act, 1985, exercising the exemption power under the Central Excise Rules, 1944 to remit the duty otherwise leviable on such tariff-classified compressed air.