Table 1.

³⁵SO₄²⁻ concentrations in size-segregated aerosol samples collected at the University of California, San Diego in spring of 2014

Date	Total airflow (m3)	35SO42− (atoms m−3)
		>7.2 µm	0.95–7.2 µm	<0.95 µm
March 27 to April 4	11,647	12 ± 7	33 ± 5	90 ± 4
April 6 and 7	1,543	n.d.	n.d.	170 ± 40
April 12–18	9,503	15 ± 8	77 ± 6	230 ± 10
May 3–7	7,176	4 ± 6	75 ± 8	7,390 ± 50
May 10–14	7,571	n.d.	50 ± 10	370 ± 20
May 19–23	7,727	3 ± 7	51 ± 7	130 ± 10

n.d., Not detectable.