Olivier Martimort, general manager of Paris-based air analysis devices company NanoSense, told TechLand that when they opened for business last week, they sold more geiger counters by 10:30 a.m. than they had sold in the previous six years.

“We are now out of stock,” he said. “It’s not just us, and not just in Paris. Geiger counters are going out of stock worldwide right now.”