Every spring, dust storms born in the Gobi cross 3,000 kilometres in three days. They affect 560 million people in a single event. Tree planting in Mongolia is one of the few interventions known to reduce them.
Sourced from peer-reviewed studies, NASA, UNCCD, JMA, and major news outlets — every number on this page is linked.
The Gobi Desert and the Mongolian steppe are now ranked among the world's most prolific dust sources. The mechanism is simple: lose the grass, lose the soil crust, lose two billion tonnes of topsoil to the wind every year.
In 2024, 76.8% of Mongolia was classified as degraded land. Roughly 64.7% is desertified outright. Forest cover is just 5.0%, and Mongolia has lost 10.7% of its tree cover since 2001.
The country is warming nearly three times the global average. Mean annual temperature rose 2.24°C between 1940 and 2015 while precipitation fell about 7%. As of 2024, the dominant trigger of extreme Gobi dust events is no longer wind alone — it is extreme drought.
Mongolian Hydromet data, four-decade trend.
Source: Mongolian Hydromet (PMC review, 2021).
Mongolian cyclones and the East Asian westerly jet sweep the dust east-southeast. It crosses China overnight, the Korean peninsula by day two, Japan by day three. In strong years it reaches North America in seven.
In the March 2023 mega-storm, dust covered 3.62 million km² and reached 560 million people. An attribution study by China's Academy of Sciences found Mongolia contributed more than 42% of the dust experienced by China.
Each country has its own word for it — sha chen, hwangsa, kosa — and its own catalogue of damage. The numbers are not abstractions; they are flight cancellations, hospital admissions, school closures, and lost crops.
First and worst-hit major city.
March 14, 2021 — the worst sandstorm in a decade. Beijing PM10 hit roughly 9,350 µg/m³ — about 180 times the WHO 24-hour limit. Visibility fell below 300 m. Over 400 flights were cancelled.
Spring 2023 saw at least ten sandstorms — the most in a decade. By April 11, Beijing was on its fourth sandstorm in a single month.
Hwangsa days have quintupled since 1960.
Hwangsa days rose from ~2/year in the 1960s to 11/year in the 2000s. Since 2000 there has been no single year without yellow dust.
A single bad dust year (2002) cost Korea an estimated $3.9–7.3 billion — 0.6–1.0% of GDP. Seoul recorded 9 hwangsa days in 2024; the OECD warns of 1,069 premature deaths per million by 2060 if pollution worsens.
JMA monitors kosa at 11 stations.
The Japan Meteorological Agency observes kosa at 11 stations nationwide; the 30-year normal is 13 days/year, with 14 observed in 2023.
Kyushu — Japan's first landfall — sees ultra-fine particle concentrations rise sharply during kosa. JMA explicitly ties the trend to "desertification, deforestation, and soil degradation" upwind.
Asian dust is not just sand. By the time it reaches the coast, it is mixed with industrial pollution — sulphates, mercury, cadmium — and shrunk to particles small enough to slip past the alveoli and into the bloodstream.
Risk increase on dust days; 89-study meta-analysis (PMC).
Circulatory deaths spike; same meta-analysis.
Reported physical or mental distress from dust (2019 survey).
Excess mortality 3.3–12.5%% across causes (Nature Comms 2023).
Children, the elderly, and people with chronic respiratory illness face the highest risk during high-density events (PMC review). PM2.5 particles "translocate directly into the bloodstream," carrying with them whatever the dust collected on its 3,000-km flight.
It sounds like wishful symbolism. It is actually one of the few interventions with measured outcomes. The closest natural experiment — China's Three-North Shelterbelt — has been running for 47 years.
A row of trees breaks the boundary-layer wind, dropping speed by 30–60% downwind for distances up to 20× the canopy height. Slower wind = soil stays put. Soil stays put = no dust.
Mongolia's national response is the One Billion Trees campaign, announced by President Khurelsukh at the 76th UN General Assembly in 2021. Of that billion, 330 million trees are explicitly earmarked to "combat desertification and reduce sources of sandstorms and dust storms." By October 2024, 84 million had already been planted.
Green Shield Mongolia is a small, audited slice of that effort. We work with herder cooperatives in Khovd, Khentii, Arkhangai, and the Gobi soums where the dust starts. Every donation funds saplings, three years of monitoring, and a published survival report.
From $10. Native species, tracked by GPS, audited at year three. Every cohort gets a public field report.
