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Tallying emissions in ports and at sea

Ships are major contributors to acid rain and ground-level ozone concentrations in some regions

Emissions from oceangoing ships substantially boost acid rain on shore and may account for more than a quarter of the ground-level ozone in some coastal areas, a new study reveals.

Many commercial vessels, especially long-haul cargo ships, spend much of their time in international waters. Nevertheless, exhaust from these ships contributes to onshore pollution: Studies have shown that about 70 percent of shipping occurs within 400 kilometers of land.

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