N2O emissions from nitric acid plants can range from about 2 to 20 kg (5 to 50 lbs ) per ton of HNO3 or up to 3500 ppm concentration in the tail gas, depending on the nitric acid process and plant operating conditions. The CRI N2O catalyst technology is highly effective in significantly reducing N2O emissions from of 90+% can be achieved. The CRI technology is a tertiary N2O removal technology for installation in the tail gas stream of the nitric acid process after the absorber, so unlike secondary technologies, there is no effect on plant operation or nitric acid production. The CRI N2O technology can be installed in either the high pressure position upstream of the expander or in the low pressure position downstream of the expander. Both options benefit from the low pressure drop of the CRI N2O abatement system.