Some 40 per cent of the injuries caused by fireworks each year arise from the improper handling of firecrackers and sparklers, according to the National Council on Fireworks Safety (CPSC) so it isn’t only big and/or illegal fireworks that can cause harm. Never allow young children to ignite fireworks, the council says. Light fireworks on the ground and get to a safe distance before they ignite. Never ignite fireworks in metal or glass containers. And douse spent fireworks with water before throwing them in the trash.