For Compliance with Clean Air Act General Conformity provisions USACE NAN (on behalf of NAP) is required to purchase ozone season NOx allowances (in tons) under the Cross-State Air Pollution Rule (CSA... For Compliance with Clean Air Act General Conformity provisions USACE NAN (on behalf of NAP) is required to purchase ozone season NOx allowances (in tons) under the Cross-State Air Pollution Rule (CSAPR) to offset project NOx emissions. The credits shall be sent to a location directed by USACE Credits must be made available upon award on the contract.