Ozone Season NOₓ Emissions (thousand tons)					Ozone Season NOₓ Rate (lb/mmBtu)
Primary Fuel	2000	2005	2010	2020	2021	2000	2005	2010	2020	2021
Coal	Ozone Season NOₓ Emissions (thousand tons)	1,926	1,117	821	253	282	Ozone Season NOₓ Rate (lb/mmBtu)	0.43	0.25	0.19	0.13	0.12
Gas	Ozone Season NOₓ Emissions (thousand tons)	196	96	79	85	73	Ozone Season NOₓ Rate (lb/mmBtu)	0.19	0.07	0.04	0.03	0.03
Oil	Ozone Season NOₓ Emissions (thousand tons)	78	52	12	1	1	Ozone Season NOₓ Rate (lb/mmBtu)	0.31	0.25	0.13	0.09	0.13
Other	Ozone Season NOₓ Emissions (thousand tons)	1	2	2	2	3	Ozone Season NOₓ Rate (lb/mmBtu)	0.25	0.40	0.11	0.08	0.09
Total / Average	Ozone Season NOₓ Emissions (thousand tons)	2,201	1,267	914	341	359	Ozone Season NOₓ Rate (lb/mmBtu)	0.38	0.20	0.15	0.07	0.07