lowest era by a team in a season since 1970

Since 1970, the Baltimore Orioles have the lowest ERA by a team in a season, with an ERA of 2.53 in 1972.

	TEAM	ERA	SEASON	G	W%	W	L	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Orioles	2.53	1972	154	.519	80	74	154	788	62	18	21	1371.2	1,116	386	430	85	395	15	52	5,493	35	5.17	2.59	1.99	0.56	14.3	7.2	1.10	.245	2.82	7.32
2	Athletics	2.58	1972	155	.600	93	62	155	862	42	15	43	1417.2	1,170	406	457	96	418	19	41	5,718	29	5.47	2.65	2.06	0.61	15.1	7.3	1.12	.248	2.90	7.43
3	Astros	2.66	1981	110	.555	61	49	110	610	23	13	25	990.0	842	293	331	40	300	11	24	4,034	36	5.55	2.73	2.03	0.36	15.1	7.4	1.15	.261	3.01	7.65
4	Dodgers	2.78	1972	155	.548	85	70	155	856	50	21	29	1403.0	1,196	434	527	83	429	34	36	5,795	43	5.49	2.75	2.00	0.53	14.8	7.4	1.16	.253	3.38	7.67
5	Dodgers	2.80	2022	162	.685	111	51	162	1,465	1	1	43	1451.1	1,114	451	513	152	407	75	13	5,865	38	9.08	2.52	3.60	0.94	25.0	6.9	1.05	.255	3.18	6.91
6	Pirates	2.81	1972	155	.619	96	59	155	838	39	9	48	1414.1	1,282	441	512	90	433	29	60	5,845	34	5.33	2.76	1.94	0.57	14.3	7.4	1.21	.268	3.26	8.16
7	Twins	2.84	1972	154	.500	77	77	154	838	37	11	34	1399.1	1,188	441	535	105	444	37	42	5,750	26	5.39	2.86	1.89	0.68	14.6	7.7	1.17	.250	3.44	7.64
8	Astros	2.90	2022	162	.654	106	56	162	1,524	3	1	53	1445.1	1,121	465	518	134	458	60	6	5,856	56	9.49	2.85	3.33	0.83	26.0	7.8	1.09	.268	3.23	6.98
9	Yankees	2.90	1981	107	.551	59	48	107	606	16	0	30	948.0	827	305	343	64	287	10	17	3,872	25	5.75	2.72	2.11	0.61	15.7	7.4	1.18	.263	3.26	7.85
10	Mets	2.91	1988	160	.625	100	60	160	1,100	31	17	46	1439.0	1,253	465	532	78	404	35	33	5,877	41	6.88	2.53	2.72	0.49	18.7	6.9	1.15	.276	3.33	7.84
11	Indians	2.92	1972	156	.462	72	84	156	846	47	11	25	1410.0	1,232	457	519	123	534	40	92	5,877	43	5.40	3.41	1.58	0.79	14.4	9.1	1.25	.256	3.31	7.86
12	Dodgers	2.92	1975	162	.543	88	74	162	894	51	17	21	1469.2	1,215	477	534	104	448	28	20	6,015	34	5.47	2.74	2.00	0.64	14.9	7.4	1.13	.245	3.27	7.44
13	Cardinals	2.94	2015	162	.617	100	62	162	1,329	1	0	62	1464.2	1,359	478	525	123	477	45	37	6,134	48	8.17	2.93	2.79	0.76	21.7	7.8	1.25	.297	3.23	8.35
14	Mets	2.94	1976	162	.531	86	76	162	1,025	53	17	25	1449.0	1,248	473	538	97	419	23	56	5,908	43	6.37	2.60	2.45	0.60	17.3	7.1	1.15	.265	3.34	7.75
15	Dodgers	2.95	1989	160	.481	77	83	160	1,052	25	14	36	1463.1	1,278	479	536	95	504	27	73	6,034	53	6.47	3.10	2.09	0.58	17.4	8.4	1.22	.272	3.30	7.86
16	Athletics	2.95	1974	162	.556	90	72	162	755	49	11	28	1439.2	1,322	472	551	90	430	25	41	5,937	27	4.72	2.69	1.76	0.56	12.7	7.2	1.22	.266	3.44	8.26
17	Dodgers	2.96	1985	162	.586	95	67	162	979	37	16	36	1465.0	1,280	482	579	102	462	21	56	6,043	42	6.01	2.84	2.12	0.63	16.2	7.6	1.19	.263	3.56	7.86
18	Tigers	2.96	1972	156	.551	86	70	156	952	46	11	33	1388.1	1,212	457	514	101	465	47	41	5,748	41	6.17	3.01	2.05	0.65	16.6	8.1	1.21	.266	3.33	7.86
19	Dodgers	2.96	1988	162	.584	94	67	162	1,029	32	15	49	1463.1	1,291	482	544	84	473	22	61	6,050	43	6.33	2.91	2.18	0.52	17.0	7.8	1.21	.272	3.35	7.94
20	Dodgers	2.97	1974	162	.630	102	60	162	943	33	13	23	1465.1	1,272	484	561	112	464	24	9	6,056	36	5.79	2.85	2.03	0.69	15.6	7.7	1.18	.257	3.45	7.81
21	Orioles	2.99	1971	158	.639	101	57	158	793	71	13	22	1415.1	1,257	470	530	125	416	18	37	5,799	37	5.04	2.65	1.91	0.79	13.7	7.2	1.18	.255	3.37	7.99
22	Mets	2.99	1971	162	.512	83	79	162	1,157	42	9	22	1466.1	1,227	487	550	100	529	40	63	6,078	41	7.10	3.25	2.19	0.61	19.0	8.7	1.20	.265	3.38	7.53
23	Dodgers	3.00	1973	162	.590	95	66	162	961	45	13	38	1491.0	1,270	497	565	129	461	29	38	6,100	47	5.80	2.78	2.08	0.78	15.8	7.6	1.16	.252	3.41	7.67
24	Pirates	3.01	1975	161	.571	92	69	161	768	43	11	31	1437.1	1,302	480	565	79	551	20	102	6,072	37	4.81	3.45	1.39	0.49	12.6	9.1	1.29	.263	3.54	8.15
25	Dodgers	3.01	1981	110	.573	63	47	110	603	26	15	24	997.0	904	333	356	54	302	14	38	4,099	19	5.44	2.73	2.00	0.49	14.7	7.4	1.21	.272	3.21	8.16