Indoor air. a convective kerosene heater is tested in a well-mixed 35 m3 atm, having an air exchange rate of 0.42 ach. the room is free of no before 9. (15 points 25 °c the and 1 atm, having an air e ng heater. after one hour of operation, the no concentration reached 5.2 ppmv a conservative pollutant, calculate the emission rat assuming that no no is e (mg/hr) of no from the heater.