Astronauts aboard the International Space Station captured striking images in the summer of 2026: a thick layer of smoke hangs over the snow‑capped peaks of Mount Hood and Mount Rainier. The orbital perspective makes the wide extent of fires in the Pacific Northwest visible and shows how smoke and particles are transported high into the atmosphere.
Air quality and health
The photos document not fog but fine particulate layers originating from multiple fires. Near the surface, the smoke sharply degrades air quality; fine particles (PM2.5) penetrate deep into the lungs and raise risks for cardiovascular and respiratory illnesses. Older people, children and those with preexisting conditions are especially vulnerable. Reduced visibility also affects tourism and creates strains for agriculture.
Aerosols aloft
Intense fires generate smoke plumes that updrafts carry into the free troposphere. There, soot and organic particles can remain airborne longer and travel long distances. Light‑colored particles reflect sunlight, while dark particles like soot absorb it—effects that can alter the regional radiation balance, cloud formation and precipitation patterns.
Impacts on snow and ice
When dark particles settle on snow and ice, albedo drops: the surface reflects less sunlight and absorbs more energy. That accelerates melting. On mountains such as Mount Hood and Mount Rainier, this changes the timing and magnitude of seasonal runoff into downstream river systems.
Weather in 2026 and the climate trend
The summer of 2026 was unusually hot and dry in parts of the U.S. Northwest. Extended heat spells, early snowmelt and low soil moisture increased fire susceptibility. Climate change amplifies these risks by increasing heat, extending dry periods and shifting vegetation cycles. Warmer winters can also favor pest outbreaks that weaken forests and create additional fuel.
Acute and long‑term effects
In the short term, smoke events cause poor air quality, health advisories, reduced visibility and local evacuations. Over the long term, repeated large fires alter soils, vegetation patterns and watershed stability. Emissions of carbon dioxide, soot and other gases affect atmospheric composition and—depending on scale and frequency—can influence the greenhouse gas balance.
Observation from space and on the ground
The ISS photos complement satellite measurements that track plume spread, particle concentrations and temperature fields. Combined with ground observations, they help form a situational picture that supports warnings, protection of vulnerable populations and planning for possible evacuations.
Society and ecosystems
The impacts of the fires extend beyond forests. Changes in snow and ice dynamics affect drinking water supplies, agriculture and infrastructure such as reservoirs. While fire is a natural element in some ecosystems, increasing intensity and frequency make adaptation more difficult. Potential consequences include species losses, enhanced erosion and the conversion of forests to grasslands.
Interpreting the images
The ISS images link visible landscape changes to health, hydrological and climatic processes. They demonstrate how local fires can produce regional—and in some cases wider—effects, underscoring the value of international observation capabilities.
Outlook
With fires becoming more frequent and intense, preparedness, health protection and adaptation gain importance. Precise monitoring, adapted forest and water management, and support for especially vulnerable groups are key components of responding to a changing risk landscape.