Fifty-five fixed sources from industry were tested for CO and NOx emissions
, before and after being converted to natural gas. Measured emissions in te
rms of ppm corrected to 20% excess air and the standard deviation of the sa
mple are summarized. From this darn, emission factors are calculated and co
mpared to the ones reported by EPA AP-42 compilation. In general there is g
ood agreement between both sets of data. Additionally, emission factors in
terms of kg of pollutant per MJ of net heat released is calculated in order
to compare emissions with different fuels. In general, NOx emissions are r
educed with conversion to natural gas, except in high temperature processes
. Changes in CO emissions are not clear dire to high dispersion on the data
. However it seems there is a potential to improve CO emissions with simple
measures.