The 2027 NOx standard as it stands at present drops to 35 milligrams per horsepower-hour from 200 mg/horsepower-hour. Zeldin cited the regulatory and compliance costs plus the impact on the cost ...

A boiler system classified as low NOx can be relied upon to emit NOx levels below 80 milligrams per normal cubic meter (mg/Nm³) during combustion. Ultra-Low NOx Emissions Ultra-low NOx emissions ...