Convert 1 Microgram per Square Millimeter to Gigagram per Square Kilometer

1 µg/mm² (Microgram per Square Millimeter) is equal to 0.001 Gg/km² (Gigagram per Square Kilometer). To convert from Microgram per Square Millimeter to Gigagram per Square Kilometer, multiply by 0.001 or divide by 1,000.

• 1 µg/mm² × 0.001 = 0.001 Gg/km²
• 1 µg/mm² ÷ 1000 = 0.001 Gg/km²