Table 2.

Mean and range of PPE densities across studies.

Country	City	Area	PPE density (PPE m−2)		Reference
			Mean	Range
Bangladesh	Cox's Bazar	Beach	6.29 × 10−3	3.16 × 10−4–2.18 × 10−2	This study
Peru	Lima	Beach	6.42 × 10−5	0–7.44 × 10−4	(De-la-Torre et al., 2021)
Chile	Nationwide	Beach	6.00 × 10–3a	–	(Thiel et al., 2021)
Kenya	Kwale and Kilifi	Beach	–	0–5.6 × 10−2	(Okuku et al., 2020)
Persian Gulf	Bushehr	Beach	–	7.71 × 10−3–2.70 × 10−2	(Akhbarizadeh et al., 2021)
Canada	Toronto	Urban	1.01× 10−3	0–8.22 × 10−3	(Ammendolia et al., 2021)

^aOnly face masks were counted.