Compliance & Safety
Dangerous Goods Questions and Answers: Test Your Knowledge
This quiz focuses on applying the IATA Dangerous Goods Regulations (aligned to ICAO Doc 9284) to real shipping decisions—classification, packing instructions, labeling, and documentation. Errors can trigger carrier rejections, reportable incidents, and regulator findings under U.S. DOT/PHMSA HMR and FAA oversight, with five- to six-figure civil penalties per violation.
Choose quiz length
1Which IATA publication provides the primary rules for transporting dangerous goods by air?
2Which class covers flammable liquids under the IATA DGR?
3UN numbers in the context of dangerous goods are used to identify what?
4Dangerous goods are classified primarily based on which characteristic?
5What does a Packing Instruction (PI) in the IATA DGR specify?
6Which packing group represents the highest level of danger?
7Which marking helps handlers keep a liquid package upright?
8Which item is commonly required on dangerous goods documentation to support emergency response?
9Acids (Class 8) and bases should generally be kept separate to reduce the risk of dangerous reactions.
True / False
10Class 9 dangerous goods are always the most dangerous class and therefore require the strictest segregation.
True / False
11Which type of lithium battery is assigned UN 3480?
12A shipper prepares a consignment and writes the UN number but forgets the Proper Shipping Name on the declaration. What is the most accurate compliance outcome?
13You are inspecting a fiberboard box containing inner bottles of a Class 3 liquid. Which additional marking is most critical to verify for safe handling?
14A package is prepared for a substance assigned Packing Group I. Which approach best matches the intent of packing group requirements?
15During build-up, a handler proposes loading an oxidizer package next to a flammable liquid package to save space. What is the best general response?
16A dangerous goods shipment can be accepted based solely on correct package labels even if the Shipper’s Declaration is missing when it is required.
True / False
17A product is described as “paint” with UN 1263 and a flammable liquid hazard. Which class label should match this entry in most cases?
18A shipper wants to rely on “Limited Quantity” to simplify a shipment. Which statement best reflects what still must be correct?
19Select all that apply. Which items are part of a practical package check-list for regulated dangerous goods before tendering to an airline?
Select all that apply
20Select all that apply. Which data elements are commonly required on a Shipper’s Declaration for Dangerous Goods?
Select all that apply
21Select all that apply. Which pairings are commonly treated as higher-risk incompatibilities requiring segregation controls?
Select all that apply
22Select all that apply. Which statements about lithium battery entries are generally correct?
Select all that apply
23A shipper selects a packaging that is performance tested, but the net quantity per package exceeds the limit in the applicable Packing Instruction. What is the best interpretation?
24An acceptance checker finds that the package shows UN and Proper Shipping Name, but the declaration lists a different packing group than the one applicable to the substance. What is the most appropriate action?
25A warehouse has one spill response kit available. Two incidents occur: a small acid leak and a small base leak. Which response principle best reduces escalation risk while waiting for trained responders?
26A shipper uses an overpack to consolidate several fully labeled packages. The individual package labels are not visible through the overpack. What is required?
27A customer offers lithium ion batteries packed with equipment, but the package only shows a Class 9 label and no lithium battery mark where one is required. What is the best acceptance outcome?
28Select all that apply. A shipper is preparing a Class 3 flammable liquid in combination packaging. Which controls are typically relevant?
Select all that apply
29A shipper describes an item as “battery-powered equipment” and lists UN 3480 on the paperwork. The equipment contains the batteries. What is the most likely issue?
30A shipper chooses a Packing Instruction based on the correct UN number but uses inner packagings that are not compatible with the liquid, causing softening and seepage. Which compliance concept was missed?
31Select all that apply. A regulated DG consignment is presented with a correct UN number, but acceptance staff suspect it may be misdescribed. Which indicators are strongest red flags?
Select all that apply
High-Frequency IATA DGR Errors That Cause Rejections (and How to Prevent Them)
Most dangerous goods failures aren’t “hard” problems—they’re consistency problems across classification, packing, and paperwork. Use the checks below to reduce shipment holds, operator rejections, and audit findings.
Classification and ID errors
- Using a trade name instead of the Proper Shipping Name (PSN) (e.g., “lab solvent” instead of the PSN tied to a UN number). Fix: always start with the UN number/PSN entry, then confirm primary hazard and any subsidiary risk.
- Confusing “UN number” with “packing instruction” or assuming the same UN number means the same packaging every time. Fix: verify packing group, form (solid/liquid), and any special provisions before selecting the packing instruction.
Packaging and quantity control mistakes
- Packing Group mismatch (PG II packaging used for a PG I assignment). Fix: confirm PG on the Shipper’s Declaration and packaging performance marking.
- Forgetting “overpack” requirements (marks/labels hidden by shrink wrap). Fix: when marks/labels aren’t visible, repeat them on the outside and add the OVERPACK marking as required.
- Orientation arrows missing or wrong for liquids in combination packagings. Fix: treat arrows as a mandatory marking whenever required—don’t rely on “this box usually ships upright.”
Marking/labeling/documentation breakdowns
- Label set doesn’t match hazards (missing subsidiary risk label or using an old label design). Fix: cross-check the UN entry: class/division + subsidiary risk + any handling label (e.g., Cargo Aircraft Only).
- Dry ice and lithium batteries treated as “minor” add-ons. Fix: dry ice (UN 1845) and lithium batteries often trigger separate packing, marking, and operator rules.
- Incomplete Shipper’s Declaration (wrong units, missing packing instruction, inconsistent quantities). Fix: do a line-by-line reconciliation: UN#, PSN, class, PG, packing instruction, net quantity, package count, and any required additional handling information.
IATA Dangerous Goods Quick Reference (Classes, Marks, Docs, and “Must-Check” Steps)
Printable note: You can print this section or save it as a PDF for a desk-side checklist during shipment preparation and pre-acceptance review.
1) Identify and classify (never skip this order)
- Identify the substance/article and find the UN number and Proper Shipping Name (PSN).
- Confirm primary class/division and any subsidiary risk.
- Confirm Packing Group (I = high, II = medium, III = low) when assigned.
- Check for special provisions that change packaging, labeling, or documentation.
2) The 9 hazard classes (memory anchor)
- Class 1: Explosives (Divisions 1.1–1.6; compatibility group matters)
- Class 2: Gases (2.1 flammable, 2.2 non-flammable/non-toxic, 2.3 toxic)
- Class 3: Flammable liquids
- Class 4: 4.1 flammable solids/self-reactive, 4.2 spontaneously combustible, 4.3 dangerous when wet
- Class 5: 5.1 oxidizers, 5.2 organic peroxides
- Class 6: 6.1 toxic, 6.2 infectious substances
- Class 7: Radioactive
- Class 8: Corrosives
- Class 9: Miscellaneous (includes many battery/engine/temperature-controlled hazards)
3) Packaging selection (what to confirm every time)
- Use the correct packing instruction for the entry (different forms/variants can point to different instructions).
- Verify packaging type: single vs combination, inner packaging limits, absorbents/cushioning if required.
- Check quantity limits for passenger vs cargo aircraft and apply Cargo Aircraft Only controls when applicable.
4) Marking and labeling (minimum reconciliation set)
- Marks: UN number + PSN, shipper/consignee, required handling marks (e.g., overpack, orientation arrows where required).
- Labels: primary hazard label + subsidiary risk label(s) + any required handling label.
5) Documentation and acceptance sanity check
- Ensure the Shipper’s Declaration (when required) matches the package: quantities, units, packing instruction, and package count.
- Confirm any emergency contact/telephone requirements that apply for the origin/destination and carrier/operator.
- Re-check segregation/incompatibility before tender (don’t pack oxidizers with fuels; keep water-reactives away from liquids/moisture sources).
Scenario Drills: Real Shipping Decisions Under IATA DGR
Use these short drills like a pre-acceptance exercise. For each scenario, state what you would classify, what you would mark/label, whether a Shipper’s Declaration is needed, and what packing instruction/limits you must verify before tender.
Drill set
- Paint shipment: A customer presents “paint” for air transport in metal cans inside a fiberboard box. What UN/PSN and class do you expect, and what two packaging/marking checks prevent the most common rejection?
- Dry ice coolant: A biomedical sample is not otherwise regulated, but it uses dry ice. What additional dangerous goods entry must be declared/marked, and what ventilation/packaging constraint must you verify?
- Lithium batteries in equipment: A shipment contains devices with lithium-ion batteries installed plus two spare battery packs in the same outer box. What classification questions determine whether this is allowed, and what is your plan to prevent short-circuit risk?
- Overpack trap: Two fully labeled packages are shrink-wrapped to a pallet for convenience. Which markings/labels must still be visible, and what do you do if the outer wrap hides them?
- Mixed hazards: A lab wants to ship a corrosive plus an oxidizer in one consignment. What segregation/incompatibility checks must you run before you even choose packaging?
- Documentation mismatch: The Shipper’s Declaration lists one net quantity, but the package shows a different inner packaging size. What is your stop-work decision, and what must be corrected before acceptance?
Tip: After answering, write the exact fields you would cross-check (UN#, PSN, class/division, subsidiary risk, PG, packing instruction, net quantity, package count, and any special provisions).
Five Non-Negotiables for Passing IATA DGR Knowledge Checks (and Preventing Real-World Incidents)
- Start with the UN number and Proper Shipping Name—trade names and SDS titles are not shipping descriptions and routinely cause misclassification.
- Packaging is not “one-size-fits-all” for a UN entry; packing group, form factor, and special provisions can change the packing instruction and permitted quantities.
- Marks/labels must agree with hazards (primary + subsidiary) and remain visible; if you create an overpack, you inherit overpack marking and visibility obligations.
- Documentation must reconcile to the package—net quantity, units, package count, and packing instruction errors are among the fastest paths to operator rejection.
- Dry ice and lithium batteries deserve “separate-line-item” attention because they introduce distinct packaging, handling, and operator-variation issues even when the main contents seem routine.
Dangerous Goods Air Transport Glossary (With Practical Usage Examples)
- UN number
- A four-digit identifier assigned to a dangerous goods substance or article. Example: “UN 1845” identifies carbon dioxide, solid (dry ice) for transport purposes.
- Proper Shipping Name (PSN)
- The standardized name that must be used on documentation and package markings. Example: Using the PSN tied to the UN number instead of a product name like “coolant spray.”
- Class/Division
- The primary hazard category (and subdivision where applicable). Example: Flammable liquids ship as Class 3; toxic gases ship as Division 2.3.
- Subsidiary risk
- An additional hazard that must be communicated with extra labeling and sometimes different handling. Example: A substance that is primarily corrosive but also toxic may require more than one hazard label.
- Packing Group (PG)
- Indicates relative degree of danger for certain classes (I, II, III). Example: Selecting a PG II-rated package for a PG I substance is a packaging nonconformance.
- Packing Instruction (PI)
- A rule set that specifies allowed packagings, inner/outer configuration, and quantity limits. Example: You verify the PI to confirm whether combination packaging is permitted for your configuration.
- Overpack
- An enclosure used to consolidate one or more packages (e.g., shrink-wrap). Example: If hazard labels are hidden by wrap, you must reproduce them on the outside and apply the OVERPACK marking where required.
Authoritative References for Dangerous Goods by Air (IATA/ICAO + U.S. DOT/FAA)
- ICAO Technical Instructions (Doc 9284) overviewThe baseline international requirements for transporting dangerous goods by air (IATA aligns to these standards, with industry formatting and additional operator detail).
- IATA Dangerous Goods Regulations (DGR)Industry publication used by airlines/forwarders for classification, packing, marking/labeling, and documentation in air cargo.
- FAA: Dangerous Goods Regulations for Air TransportationU.S. aviation-focused orientation to the Hazardous Materials Regulations and how ICAO/IATA fit into international air transport.
- PHMSA: Hazmat Transportation Training RequirementsSummary of required hazmat training elements under U.S. DOT rules (general awareness, function-specific, safety, security awareness, and records).
- UN Model Regulations (UNECE) — Recommendations on the Transport of Dangerous GoodsFoundational classification framework behind UN numbers, hazard classes, and many modal regulations worldwide.
Dangerous Goods by Air (IATA DGR) FAQ for Shippers, Forwarders, and Operations Staff
What’s the relationship between IATA DGR, ICAO Technical Instructions, and U.S. 49 CFR hazmat rules?
ICAO Doc 9284 sets the international regulatory baseline for dangerous goods by air. IATA DGR is an industry publication used operationally by airlines and shippers; it aligns to ICAO while organizing requirements for day-to-day use and reflecting operator needs. In the U.S., the Hazardous Materials Regulations (49 CFR) still apply to shipments in commerce, and enforcement can involve DOT/PHMSA and FAA oversight.
When is a Shipper’s Declaration required for air transport?
It’s typically required when you offer fully regulated dangerous goods, but some items may be excepted or documented differently depending on the entry, packaging, and airline/operator rules. The safest workflow is: confirm the UN entry’s documentation requirements, then confirm any operator variations and origin-country rules before you tender freight.
Why do dry ice (UN 1845) questions show up so often?
Dry ice is widely used as a refrigerant for non-dangerous goods, but it’s still regulated because it releases carbon dioxide gas and can create pressure/asphyxiation hazards. The practical failure modes are: missing the UN 1845 marking/quantity statement, using packaging that can’t vent safely, and forgetting operator-specific handling requirements.
What are the most common lithium battery compliance pitfalls in air cargo?
The repeat offenders are mixing up “contained in equipment” vs “packed with equipment,” failing to prevent short circuits (exposed terminals, loose spares), and applying the wrong acceptance logic for battery size/type. Many shippers also miss that airlines can impose tighter operator rules than the baseline regulation, so you must verify operator variations every time.
Does an SDS (Safety Data Sheet) replace dangerous goods classification or shipping documentation?
No. An SDS supports hazard communication for workplace safety, but it is not the legal transport classification, and it isn’t a substitute for the UN number/PSN, packing instruction selection, package marking/labeling, or the Shipper’s Declaration when required. Treat the SDS as an input, then validate against the transport entry.
How should I train beyond this quiz if I’m involved in shipping or accepting DG?
Use quiz results to target weak areas (classification, packing, marking/labeling, documentation, segregation). Then complete role-appropriate dangerous goods training that covers your job functions and operator procedures, and build a simple acceptance checklist you can execute consistently. If you also manage disruption planning for incidents and shipment holds, the Business Continuity Quiz for Employees can complement your response-readiness work.
