First of all,Several definitions should be clear.
1.1 what’s is EX? what does it do?
EX is abbreviation of English words”exlosive”,prior to transportation into and within the USA,all explosive including fireworks must be classed and approved by DOT.Federal Hazardous Material Transportation Law authorizes DOT to issue EX approvals. therefore,all fireworks must have corresponding EX number.
1.2 What’s Department Of Transportation
Serve the United States by ensuring a fast, safe, efficient, accessible and convenient transportation system that meets our vital national interests and enhances the quality of life of the American people, today and into the future.
1.3 What’s Federal Hazardous Material Transportation Law
is the principal federal law in the United States regulating the transportation of hazardous materials. Its purpose is to “protect against the risks to life, property, and the environment that are inherent in the transportation of hazardous material in intrastate, interstate, and foreign commerce” under the authority of the United States Secretary of Transportation.