Table 3. Estimates of Plastic Burning Contributions to PM_2.5 Mass at Four Sites in the USA and in Dhaka, Bangladesh^a.

			lower estimate		median estimate
site	dates of Study	n	PM2.5 mass (μg m–3)	PM2.5 mass (%)	PM2.5 mass (μg m–3)	PM2.5 mass (%)
Atlanta, Georgia	24–27 Aug, 2015	4	0.005–0.05	0.04–0.4	0.04–0.3	0.3–3
Atlanta, Georgia	19–22 Jan, 2016	4	0.02–0.08	0.3–0.8	0.2–0.6	2–7
Houston, Texas	18–20 May, 2015	3	0.01–0.04	0.1–0.2	0.09–0.3	∼1
Iowa City, Iowa	14–17 Nov, 2015	4	0.003–0.05	NA	0.03–0.4	NA
Iowa City, Iowa	16 Oct–12 Nov, 2020	10	0.03–0.09	NA	0.3–0.7	NA
Centreville, Alabama	12–14 July, 2013	4	0.004–0.02	0.03–0.3	0.03–0.2	0.3–2
Dhaka, Bangladesh	Feb–April, 2013	3	0.3–4	0.6–2	2–35	5–15

^aLower and median values were calculated using TPB-to-PM emission ratios for polystyrene (Hoffer et al.¹⁰) and the median of select literature values (Table S2), respectively. Contributions to PM_2.5 OC are reported in Table S3.