Moscow City Hall now offers visitors a unique service few other capitals can rival - a map showing the city's nuclear hot spots.
The map, available on the Internet, details research plants, decaying reactors and nuclear waste scattered around the city.
Most of the material is left over from Soviet times, when public health and the environment came a distant second to the drive to harness the atom.
But environmentalists say the map - and another showing chemically toxic sites - does not go far enough.
They are annoyed that City Hall has neglected to add in three nerve gas dumps as well.
"The radiation is everywhere; making a map is simply not the answer," said Mr Maxim Shingarkin, a spokesman for Greenpeace in Moscow. "They need to do something to get rid of it."
The government appears wrong-footed, but one environmental official, who would not be named, told The Irish Times that the problem is exaggerated.
"We are monitoring the situation. There is no danger in Moscow. A lot of the nuclear waste is anyway taken out of the city." City Hall, and Greenpeace, are unconvinced, and want a full accounting of material being held inside the city limits.
The city's flamboyant mayor, Mr Yury Luzhkov, has also set up a monitoring group, Radon, to begin cataloguing more than 200 sites which hold radioactivity of one sort or another.
Radon has already had some spectacular success: Inspectors armed with Geiger-counters recently staged raids on seven city markets and found and confiscated 150 kg of blackberries emitting 50 times the safe level of radioactivity.
Cynics might point out that Mr Luzhkov is doing himself no damage by these discoveries: the radioactive sites are the responsibility of central government with whom he has frequently clashed.
Meanwhile, Greenpeace is pushing for the army to search around a former base in the pretty wooded Kusmetski Park for nerve gas containers dumped there in the 1950s and now reported to be leaking. Visitors at the park remain stoic, however: "There's only one rule I follow," said Boris, a fisherman, watching his line snaking through the water-lilies of one of the Park's lakes.
"If you see frogs, it means the water's clean. And this place has plenty of frogs." Frogs notwithstanding, Greenpeace is worried.