Pollutants emitted from combustion sources have been regulated by local and federal governments since the early 1960s. Specific rules vary by state and air district, but they generally apply to ...

An off-road machine’s selective catalytic reduction (SCR) system converts toxic nitrogen oxides in a diesel’s exhaust—nitrogen monoxide (NO) and nitrogen dioxide (NO2)—into harmless nitrogen, water, ...

Asia Cement unveiled a selective catalytic reduction (SCR) unit at its Jecheon plant this week. The Korea Cement Association (KCA), government representatives and staff from other cement companies ...