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	Annual Toxics Summary Los Angeles-North Main Street FAQs Lead nanograms per cubic meter

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2023		2.7	4.3	*	7.6	8.3	1.78	14	1.3	*
2022		0.65	5.1	6.04	9.5	11.2	2.66	27	1.3	0.2
2021		2.0	7.0	*	10	16.3	3.42	22	1.3	*
2020		2.4	*	*	*	8.6	2.09	7	1.3	*
2019		0.65	7.2	*	11.2	20.5	4.41	29	1.3	*
2018		3.0	6.8	7.89	11.4	26.4	4.65	28	1.3	0.3
2017		1.4	6.4	*	11.6	20.2	4.04	27	1.3	*
2016		1.7	5.6	7.15	15.7	24.9	5.69	31	1.3	0.2
2015		0.65	4.5	5.41	8.2	19.3	3.50	30	1.3	0.2
2014		0.85	5.9	6.73	10.4	25	4.96	29	1.7	0.2
2013		1.7	5.9	*	10.7	19	4.06	24	1.0	*
2012		2.6	8.1	*	11.2	30	5.71	20	1.5	*
2011		3.3	10.1	*	14.9	15	3.93	12	1.5	*
2010		3.3	7.8	*	130	220	69.2	12	1.5	*
2009		0.75	10	12.2	23	32	7.00	30	1.5	0.4
2008		*	*	*	*	*	*	0	*	*
2007		3.9	12	*	26.5	43	10.1	18	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		7.0	*	*	*	34	9.88	5	3.0	*
2002		7.0	19	22.2	35.4	48	10.3	29	3.0	0.8
2001		2	19	*	32.8	48	11.4	22	4.0	*
2000		2	18	18.5	30	52	11.6	31	4.0	0.6
1999		5.0	20	31.1	33	570	101	30	4.0	1
1998		2	19	*	30.5	45	9.97	26	4.0	*
1997		2	22	*	43.2	59	15.0	17	4.0	*
1996		5.0	32	35.3	66.2	97	22.3	29	4.0	1
1995		2	29	34.3	64	77	21.2	28	4.0	1
1994		2	38.5	55.5	93.7	310	59.8	28	4.0	2
1993		14	36	*	83.4	250	48.8	23	4.0	*
1992		2	59	*	120	170	39.5	21	4.0	*
1991		17	68.5	80.5	140	190	44.1	28	4.0	3
1990		23	67	*	120	170	37.4	28	1.0	*
1989		*	*	*	*	*	*	0	*	*

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.