Table 4.

Ambient erythemal UV doses (H_er) calculated for different time intervals on days with a UVI value of 0, 1, and 2 and corresponding proportion of days with doses from those intervals exceeding one MED for the Fitzpatrick [21] skin types I to VI. (1 SED = 1 standard erythema dose = 100 J/m² weighted with the CIE erythema reference action spectrum [14]).

Time Interval (Local Solar Time, Duration)	Her (in SED); Median (p10, p90 Percentile)	Proportion of Days Exceeding one MED for Skin Type (in %)
		I	II	III	IV	V	VI
Before noon
8:00–10:00, 2 h
UVI 0	0.12 (0.05, 0.23)	0	0	0	0	0	0
UVI 1	0.42 (0.20, 0.86)	0.07	0	0	0	0	0
UVI 2	1.24 (0.69, 1.92)	7.87	2.09	0	0	0	0
7:30–10:30, 3 h
UVI 0	0.19 (0.09, 0.36)	0	0	0	0	0	0
UVI 1	0.67 (0.34, 1.31)	1.03	0.15	0	0	0	0
UVI 2	1.90 (1.11, 2.85)	44.32	19.92	0.89	0	0	0
Around noon
11:45–12:15, 0.5 h
UVI 0	0.11 (0.05, 0.19)	0	0	0	0	0	0
UVI 1	0.32 (0.20, 0.54)	0	0	0	0	0	0
UVI 2	0.74 (0.43, 1.00)	0	0	0	0	0	0
11:30–12:30, 1 h
UVI 0	0.23 (0.11, 0.37)	0	0	0	0	0	0
UVI 1	0.64 (0.40, 1.05)	0	0	0	0	0	0
UVI 2	1.46 (0.93, 1.96)	7.75	0	0	0	0	0
11:00–13:00, 2 h
UVI 0	0.44 (0.21, 0.70)	0	0	0	0	0	0
UVI 1	1.24 (0.80, 2.03)	10.99	0.49	0	0	0	0
UVI 2	2.83 (1.92, 3.80)	87.89	68.65	5.37	0	0	0
10:30–13:30, 3 h
UVI 0	0.63 (0.31, 0.99)	0	0	0	0	0	0
UVI 1	1.78 (1.15, 2.90)	39.28	20.08	0	0	0	0
UVI 2	4.08 (2.86, 5.45)	98.39	95.38	52.82	2.42	0	0
10:00–14:00, 4 h
UVI 0	0.79 (0.39, 1.23)	0	0	0	0	0	0
UVI 1	2.24 (1.43, 3.64)	60.72	39.82	4.51	0	0	0
UVI 2	5.14 (3.71, 6.88)	99.79	99.14	84.01	26.39	0	0
After noon
14:00–16:00, 2 h
UVI 0	0.12 (0.05, 0.22)	0	0	0	0	0	0
UVI 1	0.42 (0.20, 0.86)	0.08	0	0	0	0	0
UVI 2	1.24 (0.72, 1.92)	7.99	2.42	0	0	0	0
13:30–16:30, 3 h
UVI 0	0.19 (0.08, 0.36)	0	0	0	0	0	0
UVI 1	0.67 (0.33, 1.32)	1.32	0.25	0	0	0	0
UVI 2	1.92 (1.16, 2.85)	44.68	20.34	0.95	0	0	0
Total day
Sunrise–Sunset
UVI 0	1.04 (0.52, 1.65)	1.23	0.04	0	0	0	0
UVI 1	3.21 (1.95, 5.46)	88.49	70.51	32.58	4.72	0.07	0.02
UVI 2	8.17 (6.01, 10.87)	99.97	99.97	99.79	90.19	44.77	19.03