Aerosol Modulation of Ultraviolet Radiation Dose over Four Metro Cities in India

Table 1

Variation of UV erythemal dose, UV-aerosol forcing efficiency, and percentage of UVE reduction over Chennai, Mumbai, Kolkata, and Delhi.

Station	UV erythemal dose (KJm^−2)			𝐹eff (KJm^−2 AOD^−1)			UVE reduction in %
	Postmonsoon 04	Winter 04-05	Premonsoon 05	Postmonsoon 04	Winter 04-05	Premonsoon 05	Postmonsoon 04	Winter 04-05	Premonsoon 05
Chennai	4.36±0.34	4.45±0.77	6.19±0.06	−2.06±0.44	−1.31±0.34	−2.07±0.33	47.1	30	33.5
Mumbai	4.08±0.58	3.82±0.71	6.26±0.54	−1.67±0.23	−1.56±0.32	−1.93±0.23	41	41	31
Delhi	2.86±0.39	2.04±0.51	5.11±0.99	−1.38±0.33	−1.21±0.34	−1.78±0.3	48.3	60	35
Kolkata	3.72±0.14	3.06±0.67	5.48±0.77	−1.86±0.33	−1.71±0.34	−3.01±0.28	50.3	55.8	54.9