Dangerous Goods & the Rules of Their Transportation

Bysomebikram
Cargo Operations & Management · Module 3

Dangerous Goods & the Rules of Their Transportation

Nine hazard classes, three packing groups, one unforgiving rulebook — how aviation moves the world’s most hazardous cargo safely, updated for the IATA DGR 67th Edition (2026).

“A bottle of perfume. A power bank. A can of deodorant. A box of matches. To a passenger, these are everyday objects; to a cargo professional, every one of them is a regulated dangerous good. At 35,000 feet there is no fire brigade, no open window, and nowhere to pull over — which is why the rules governing hazardous cargo are among the strictest in all of transport, and why every package that flies must first be classified, packed, marked, labelled, and declared.”

What Are Dangerous Goods?

ICAO defines dangerous goods as “articles or substances which are capable of posing a risk to health, safety, property or the environment and which are shown in the list of dangerous goods in the Technical Instructions or which are classified according to those Instructions.” Many are perfectly ordinary household items — aerosols, perfumes, bleach, lighters, pesticides, batteries, camping stoves — that become hazardous in the pressurised, enclosed environment of an aircraft.

The legal chain of command: Annex 18 to the Chicago Convention sets the principles; ICAO’s Technical Instructions (Doc 9284) provide the binding detail; and the IATA Dangerous Goods Regulations (DGR) — the field manual used by airlines and forwarders worldwide — packages those rules for daily operations. The DGR is reissued annually; the current 67th Edition came into force on 1 January 2026. In India, the DGCA enforces the Aircraft (Carriage of Dangerous Goods) Rules, 2003, aligned with ICAO and IATA. Crew training requirements sit in Annex 6 (Operation of Aircraft).

The Nine Hazard Classes

The Nine Classes of Dangerous Goods CLASS 1 · Explosives Fireworks, ammunition, detonators CLASS 2 · Gases Aerosols, oxygen cylinders, camping gas CLASS 3 · Flammable Liquids Petrol, paints, perfume, alcohol (e.g. Acetal UN1088) CLASS 4 · Flammable Solids 4.1 flammable · 4.2 spontaneous 4.3 dangerous when wet CLASS 5 · Oxidizers & Peroxides 5.1 oxidizers (ammonium nitrate) 5.2 organic peroxides CLASS 6 · Toxic & Infectious 6.1 toxic (pesticides, mercury) 6.2 infectious (pathogens) CLASS 7 · Radioactive Medical isotopes, industrial sources above DGR thresholds CLASS 8 · Corrosives Hydrochloric & sulphuric acid, battery acid CLASS 9 · Miscellaneous Dry ice (−79°C), lithium batteries, magnetized material, asbestos
Original Tourism369 illustration — the nine hazard classes under the IATA DGR / ICAO Technical Instructions.

Class 9 deserves special attention in the exam hall and the warehouse alike: it includes dry ice (solid CO₂ at −79°C, which sublimates into a suffocating gas in enclosed spaces), magnetized material (anything deflecting a compass more than 2 degrees at 2.1 metres), and — most scrutinised of all today — lithium batteries.

Packing Groups, UN Numbers & Quantity Limits

Within most classes, substances are assigned a Packing Group by degree of danger — PG I (great danger), PG II (medium danger), PG III (minor danger) — which determines how robustly they must be packed and how much may ship. Every regulated substance also carries a Proper Shipping Name and a four-digit UN number from the Dangerous Goods List. Example: Acetal, a flammable liquid, is UN 1088, Class 3, Packing Group II.

Quantity limits differ by aircraft type: every Dangerous Goods List entry shows separate allowances for passenger aircraft and cargo aircraft. A package bearing the black-and-orange CARGO AIRCRAFT ONLY (CAO) label may never travel on a passenger flight, while passenger-approved packages may fly on either.

The Packing Group Ladder PG I GREAT danger Strictest packing, smallest quantities PG II MEDIUM danger e.g. Acetal UN 1088 PG III MINOR danger Most lenient limits Higher danger → stronger packaging → smaller permitted net quantity per package
Original Tourism369 illustration — the three packing groups by degree of danger.

Three Packaging Options

1. Specification Packaging
UN performance-tested packaging — drop-tested, pressure-tested, stack-tested — bearing UN specification marks. The default for fully regulated dangerous goods.
2. Limited Quantities
A relaxed regime for small amounts of PG II and PG III materials, listed against each entry in the IATA Dangerous Goods List (the “Y” packing instructions).
3. Excepted Quantities
Very small quantities that may ship without hazard labels under the special provisions of DGR Section 2.7.

Marking, Labelling & the Shipper’s Declaration

The shipper carries the legal responsibility for the whole compliance chain: identifying the goods, classifying them into the right class and packing group, packing them correctly, marking each package with the Proper Shipping Name and UN number (in English, plus any state language), affixing hazard labels, and signing the Shipper’s Declaration for Dangerous Goods (DGD) — retained for a minimum of three months. The Air Waybill itself does not transmit the dangerous goods detail; the DGD does, recording shipper and consignee, aircraft type, origin and destination, shipping name, class, UN number, subsidiary risk, quantity, packing instruction, and certification. Where agreed with the operator, the declaration may be electronic (EDP/EDI).

The Shipper’s Five Duties 1. IdentifyIs it dangerous? 2. ClassifyClass + PG + UN no. 3. PackPer packing instruction 4. Mark & LabelName + UN + hazard label 5. DeclareSign the DGD Liability cannot be delegated — the shipper signs, the shipper answers
Original Tourism369 illustration — the shipper’s compliance sequence under the IATA DGR.

Undeclared Goods, Inspection & the Lithium Battery Era

If an operator discovers mis-declared or undeclared dangerous goods, Indian rules require a report to the Director-General of the DGCA naming the reporter, the shipper, the date and place of detection, and the class, shipping name, and quantity found. The pilot-in-command must receive written notification of dangerous goods on board before departure (NOTOC), and the DGCA may inspect premises, equipment, and records at any reasonable time. Accidents and incidents involving dangerous goods must likewise be reported with full aircraft, operator, and flight details.

The frontier issue of this decade is the lithium battery. Under the DGR 67th Edition (effective 1 January 2026), the long-recommended limit became law: lithium-ion batteries shipped as cargo must be offered at no more than 30% state of charge, with shipments above 30% requiring written approval from both the state of origin and the operator’s state. Passengers may still carry small lithium batteries, toiletries, and alcohol under 70% in the cabin within limits — but spare batteries belong in carry-on, never in the hold.

🎯 UGC NET Key Points — Module 3
◆ ICAO definition: articles/substances posing risk to health, safety, property or environment, listed/classified per Technical Instructions
◆ Legal chain: Annex 18 → ICAO Technical Instructions (Doc 9284) → IATA DGR (67th Edition, in force 1 Jan 2026) · crew training under Annex 6
◆ India: DGCA — Aircraft (Carriage of Dangerous Goods) Rules, 2003
◆ 9 classes: 1 Explosives · 2 Gases · 3 Flammable liquids · 4 Flammable solids (4.1/4.2/4.3) · 5 Oxidizers & organic peroxides (5.1/5.2) · 6 Toxic & infectious (6.1/6.2) · 7 Radioactive · 8 Corrosives · 9 Miscellaneous (dry ice, lithium batteries, magnetized material)
◆ Packing Groups: PG I great · PG II medium · PG III minor danger
◆ UN number = 4-digit ID with Proper Shipping Name (Acetal = UN 1088, Class 3, PG II)
◆ CAO = black-and-orange Cargo Aircraft Only label
◆ Packaging options: specification (UN-tested) · limited quantities · excepted quantities (DGR 2.7)
◆ Shipper’s Declaration (DGD) — shipper’s responsibility, kept minimum 3 months · AWB does not carry DG detail
◆ Magnetized material = compass deflection >2° at 2.1 m
◆ Dry ice = solid CO₂ at −79°C — suffocation/cold-burn hazard
◆ DGR 67th Ed: lithium-ion cargo shipments capped at 30% state of charge (mandatory from 1 Jan 2026)
◆ Mis-declared/undeclared goods → report to Director-General, DGCA

People Also Ask: Dangerous Goods by Air

Answers to the questions most commonly searched on Google about this topic.

What are dangerous goods in aviation?
Articles or substances capable of posing a risk to health, safety, property, or the environment when transported by air — from obvious hazards like explosives and acids to everyday items like aerosols, perfume, matches, and lithium batteries. Their carriage is governed by ICAO’s Technical Instructions and the IATA Dangerous Goods Regulations.
What are the 9 classes of dangerous goods?
Explosives (1), gases (2), flammable liquids (3), flammable solids (4), oxidizing substances and organic peroxides (5), toxic and infectious substances (6), radioactive material (7), corrosives (8), and miscellaneous dangerous goods (9) — the last including dry ice, magnetized material, and lithium batteries.
What is a UN number?
A four-digit identifier assigned to each regulated substance in the Dangerous Goods List, used worldwide with the Proper Shipping Name. For example, Acetal is UN 1088 — a Class 3 flammable liquid in Packing Group II.
Can you ship lithium batteries by air?
Yes, under strict conditions. Since 1 January 2026 (IATA DGR 67th Edition), lithium-ion batteries shipped as cargo must be at no more than 30% state of charge — now a mandatory rule, not a recommendation. Higher charge levels need approval from both the origin state and the operator’s state. Passengers carry spare batteries in the cabin only, never in checked baggage.
What is the Shipper’s Declaration for Dangerous Goods?
The legal document in which the shipper certifies that a consignment is fully and accurately classified, packed, marked, and labelled per the regulations. It travels with the shipment, must be retained for at least three months, and may be electronic where the operator agrees.
What happens if dangerous goods are undeclared?
Undeclared or mis-declared dangerous goods are treated as serious safety violations. In India the operator must report the discovery to the DGCA’s Director-General with details of the shipper and the goods, and investigations and penalties can follow. Globally, such shipments have caused fatal accidents — which is why detection triggers immediate reporting.
What is the IATA DGR?
The IATA Dangerous Goods Regulations — the airline industry’s annually updated field manual for shipping hazardous cargo, built on ICAO’s Technical Instructions. The 67th Edition took effect on 1 January 2026, tightening lithium battery rules among other changes.
Verified sources: Facts cross-checked in June 2026 against IATA (DGR 67th Edition significant changes and addendum, effective 1 January 2026), ICAO Annex 18 / Doc 9284 references, and DGCA’s Aircraft (Carriage of Dangerous Goods) Rules, 2003. The new mandatory 30% state-of-charge rule for lithium battery cargo was added as a current update beyond the source study material. All prose and illustrations are original Tourism369 creations — copyright-free and plagiarism-safe.
Tourism369 · Cargo Operations & Management · Part 8 · Module 3 · UGC NET Paper 2

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