In the wake of a recent peace agreement that eased tensions in the Strait of Hormuz and allowed maritime traffic to gradually resume, environmental concerns persist in the Arabian Gulf due to the prolonged detention of oil tankers during the confrontation. While diplomatic efforts have focused on stabilizing energy markets and reopening trade routes, the ecological consequences of weeks-long vessel congestion remain significant.
At the height of the standoff, over 85 oil tankers were held stationary in the Gulf for periods exceeding 10 days. These vessels, each weighing hundreds of thousands of tonnes, consumed between 20 and 40 tonnes of fuel daily to maintain onboard systems even while inactive. This fuel consumption resulted in the release of substantial quantities of pollutants, including 3 to 5 tonnes of sulfur dioxide (SO2), 4 to 7 tonnes of nitrogen oxides (NOx), and over 100 tonnes of carbon dioxide (CO2) per day. In addition, hazardous particulates such as PM2.5 and polycyclic aromatic hydrocarbons (PAHs) accumulated, posing long-term risks to both human health and marine ecosystems.
Because the Arabian Gulf is a semi-enclosed basin with limited water renewal, these emissions did not disperse readily. Instead, pollutants settled over the water’s surface and dissolved into the sea, contributing to acidification, oxygen depletion, harmful algal blooms, and a noticeable decline in coral reef health—one of the region’s most vulnerable environments. Moreover, NOx and SO2 emissions have led to acid rain, which accelerated coastal erosion and degraded soil and water quality beyond the immediate crisis period.
Beyond chemical contamination, the stationary ships generated continuous underwater noise reaching 180 decibels, comparable to a jet engine’s intensity. This acoustic pollution disrupted marine mammals that rely on echolocation, including dolphins, stressed dugongs, and altered humpback whale migration. Fish populations also suffered, with vibrations interfering with their reproductive and feeding behaviors, further threatening species important to local fisheries.
Small but persistent oil leaks added to the damage. Ships released 2 to 6 liters per day of fine oils, lubricants, and contaminated ballast water, creating surface films that hinder oxygen exchange, smother coral reefs, kill fish larvae, and affect seabirds. Toxic compounds such as benzene, toluene, ethylbenzene, and xylene accumulated in marine organisms, with potential impacts cascading up the food chain to humans.
Even after the maritime congestion subsided, the Gulf continues to contend with residual micro-pollution. The discharge of ballast water may have introduced non-native microorganisms, raising concerns about invasive species that disrupt local ecosystems. Coastal areas in Gulf states such as the United Arab Emirates, Oman, and Bahrain, which depend heavily on desalination for drinking water, experienced clogged intake filters and elevated treatment costs due to increased pollution levels. Furthermore, oil patches found their way to shorelines, affecting tourism and placing additional pressure on fisheries already strained by low oxygen levels. Environmental assessments estimate that sustained particulate and oil contamination could reduce fishery productivity by 10 to 20 percent during extended episodes of maritime congestion.
Despite the severity of these impacts, coverage of environmental degradation related to this episode has been limited, as the effects tend to unfold gradually and without dramatic visuals. The full consequences become evident over weeks or months in declining marine populations, polluted beaches, stressed desalination infrastructure, and deteriorating coral reefs. Experts emphasize that this is an ongoing crisis without immediate spectacle but with enduring ramifications.
As diplomatic stability is restored, calls have grown for coordinated regional monitoring and action to address the environmental legacy of detained vessels in the Gulf. Advocates urge that pollution from maritime congestion be included on the agenda of the forthcoming COP17 climate conference in Armenia, highlighting the interconnectedness of maritime security with environmental, water, and food security. Integrating this issue into global climate discussions could help advance emissions reduction in shipping, improve environmental surveillance, and establish joint protocols for managing vessel detention.
Protecting strategic waterways like the Arabian Gulf, according to environmental groups and regional stakeholders, is not solely a regional challenge but a shared responsibility critical to preserving ocean health and ensuring the sustainability of natural resources for future generations.