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Biomass Boilers supported under the RHI scheme must meet strict air quality and feedstock sustainability rules. The air quality requirements ensure applicants for both RHI schemes with a biomass boiler (including Combined Heat and Power) will need to have emissions levels no higher than 30 grams per gigajoule (g/GJ) net heat input for particulate matter (PM) and 150g/GJ for oxides of nitrogen (NOx), which are the two main pollutants.<\/p>