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County	Site	Units	Max	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24
Bannock	Pocatello	µg/m³	29.6	24.2	24.7	25.3	25.5	25.8	26.2	26.6	27	27.4	27.7	28.7	29.2	29.5	29.6	29.4	28.9	28.4	27.8	28	28.1	27.8	27.3	26.7	26.5
Boise	Idaho City	µg/m³	99.5	99.5	96.3	93.4	91.2	89.6	88.7	86.7	85.2	83.5	83.3	82.3	80.8	78.5	76.7	75.2	73.6	72.2	70.5	68.5	66.3	64.8	63	60.4	57.5
Bonner	Sandpoint	µg/m³	16.1	14.7	15.1	15.3	15.5	15.7	16.1	16	15.9	15.9	15.9	15.8	15.6	15.5	15.5	15.6	15.7	15.6	15.7	15.8	15.8	15.7	15.7	15.6	15.5
Bonneville	Idaho Falls	µg/m³	16.9	16.9	16.5	16	15.8	15.8	15.7	15.9	15.9	16	16	15.7	15.9	16.1	16.2	16.2	16.1	15.9	16	16.3	16.3	16.1	15.8	15.8	16.1
Boundary	Bonners Ferry	µg/m³	16.3	13.4	14	14.5	15.2	15.5	15.7	15.9	16.2	16.3	16.2	16	16	16	15.9	15.6	15.7	15.6	15.3	15.3	15.1	15	14.7	14.6	14.5
Canyon	Nampa	µg/m³	86.7	69.6	73	75.7	78.4	81.1	83.4	85.3	86.1	86.7	86	85	82.8	79.7	76.5	74	71.7	69.3	67.4	65	62.4	60	57.7	54.9	52.5
Clearwater	Orofino - Nez Perce Tribe	µg/m³	11.3	11	11.2	10.6	10.4	10.5	10.5	10.3	10.4	10.3	10.4	10.5	10.5	10.7	10.6	10.7	10.9	10.8	10.7	10.8	11	11	11	11.2	11.3
Idaho	Cottonwood	µg/m³	17.7	17.1	16.9	16.9	16.8	16.9	16.9	16.8	16.9	17.2	17.3	17.5	17.7	17.6	17.5	17.4	16.8	16.3	15.7	15.1	14.4	14.2	14.5	14.6	14.8
Idaho	Grangeville	µg/m³	14.6	14.5	14.6	14.6	14.5	14.4	14.3	14.2	14.2	14.1	14.1	14.1	14	13.9	13.9	13.8	14	13.9	13.8	13.9	13.9	14	14.2	14.1	14.1
Kootenai	Coeur d'Alene	µg/m³	13.5	10.4	10.6	11	11	11.4	11.6	11.8	11.9	11.9	12	12.1	12.3	12.4	12.7	12.8	13	13.2	13.3	13.3	13.3	13.1	13.1	13.3	13.5
Latah	Juliaetta	µg/m³	12.5	10.9	10.8	10.9	10.6	10.3	10.3	10.1	10.1	10.4	10.7	10.5	10.2	10.5	10.7	10.9	11.1	11.3	11.5	11.5	11.6	12.1	11.9	12.2	12.5
Lemhi	Salmon	µg/m³	12.7	9.5	9.5	9.3	9.1	9	8.9	9	9	9	9.4	9.2	9.2	9.4	9.6	9.5	9.6	9.9	10.2	10.7	11.3	11.5	11.8	12.3	12.7
Lewis	Nezperce - Nez Perce Tribe	µg/m³	18.3	18.3	18.2	18.2	18	17.8	17.5	17.4	17.3	17.6	17.3	17.2	17.1	16.5	15.3	14.2	13.4	12.4	12.3	12.6	12.7	12.9	13.3	13.4	13.4
Lewis	Reubens - Nez Perce Tribe	µg/m³	13.2	12	12.2	11.8	11.7	11.6	11.9	11.7	11.9	11.9	12.3	12.3	12	11.9	12.3	12.6	12.6	13	12.5	12.4	12.3	12.6	13.1	13.1	13.2
Lewis/Idaho	Kamiah - Nez Perce Tribe	µg/m³	14.7	14.7	14.5	14.1	14	13.9	13.8	13.7	13.5	13.1	12.7	13.7	13.1	13	13.2	13	12.9	13	13.3	13.4	13.7	13.6	13.3	13.5	13.4
Nez Perce	Lapwai - Nez Perce Tribe	µg/m³	17	11.7	11.5	11.2	11	10.7	10.6	10.4	10.2	10	9.7	10	10	10.1	10.5	10.7	11.1	11.4	11.8	12.1	15.5	15.9	16	16.1	17
Nez Perce	Lewiston	µg/m³	17	13.4	13	13.1	13	12.6	12.4	12.5	13.9	13.9	14	14.1	14.2	14.2	14.4	14.6	15	15.1	15.4	15.7	16	16.3	16.7	16.8	17
Shoshone	Pinehurst	µg/m³	11.2	9.2	9	9	9.2	9.2	9.4	9.5	9.5	9.5	9.7	9.7	9.8	9.9	10	10.3	10.5	10.7	10.8	11.1	11.2	11.2	11	11.1	11.1
Twin Falls	Twin Falls	µg/m³	35	31.7	32.7	33.5	34.2	34.7	35	34.9	34.5	34.1	34.2	34.1	33.7	32.3	30.6	28.8	27.8	26.9	25.8	24.4	23.5	23	22.1	21.5	21.2