run of the mill static is a very remote possible ignition source. Unless you frequent high latitude windy dry places where static can build up to dangerous amounts. (During the dust bowl in the US chrges would build up in some farm equipment from the bllowing dust. Enough charge to knock an adult unconscious.) Electrical workers in artic climates have to take special precautions to dissapate static charges before climbing high steel power structures. Lightning is about the most powerful static charge developed on the planet. Then there are still a few cans of powder kicking around that do not have graphite coatings. Lastly, ever sleep under two hudson bay blankets in January in an unheated cabin up north? Just rolling over at night creates sufficient fire works to wake you up. So run of the mill static is not normally a problem. There are ways to increase the risk, but it almost requires intentional action to do it. Very high energy static, like lightning is surrounded by a sleeve of super heated air that can ignite almost anything. A fellow I knew supplied valves and pumps for municipal pumping stations. He showed me huge 12 inch gate valves that were fused into solid metal from lightning strikes. Steam would be created so rapidly from water inside the pipes that the pipes would explode from the pressure. So if you attach a leyden jar topped off with gun powder to a wire and used that wire to fly a kite in a thunder storm with a key on the kite's tail, , you might get the powder to ignite.