On April 2, 1979, a technician at Soviet Compound 19 in Sverdlovsk (now Yekaterinburg) removed a clogged filter from an anthrax spore drying machine. He left a note, but the shift supervisor failed to log it. The next operator turned the machine back on, releasing an aerosolized plume of Bacillus anthracis spores into the night air.
The disaster remained secret for years, officially blamed on tainted black-market meat. However, in 1992, an independent team led by Harvard biologist Matthew Meselson conducted a forensic meteorological and epidemiological reconstruction to uncover the truth. By mapping the exact addresses and death dates of 68 victims and livestock downwind, researchers aligned the casualty coordinates with historical wind data recorded at Sverdlovsk airport that night.
The wind had blown steadily from the north-northwest at around 10 to 15 kilometers per hour during the hours of release. The resulting spore dispersion created a remarkably narrow linear plume extending nearly 50 kilometers south-southeast from Compound 19. Epidemiological modeling showed that individuals located directly along the plume axis suffered fatal inhalation anthrax, while those merely a few hundred meters off-axis remained untouched.
The atmospheric stability conditions that night preserved a concentrated aerosol cloud rather than dispersing it rapidly into the upper atmosphere. Spore dispersion mechanics revealed that sub-micron spore clusters behaved as a non-settling gas, allowing deep alveolar penetration in exposed victims. Meselson's spatial-temporal analysis provided irrefutable physical proof of an industrial aerosol release, creating a masterclass in forensic meteorology that dismantled decades of Soviet official denial.