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Categories and types group entries for browsing; they are editorial, not evidence. How smells are grouped.
Also known as Underground · Metro
An urban transit smell identity combining metal, dust, warm machinery, air movement and human activity.
Setting: urban. An editorial word for the kind of place or occasion the smell belongs to, not a smell word.
A metro station smells metallic, dusty and warm, with a slightly industrial, oily note and a stale air that moves in gusts. EDITORIAL
Named in the VERIFIED claims about this smell: not a list of what it is made of, and not its cause.
This entry links to
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Links SmellBook records for this entry: where you meet it, what was written about it, molecules, related smells and comparisons. EDITORIAL links are chosen by SmellBook editors, VERIFIED links come from VERIFIED claims and HISTORICAL links describe what one source wrote at one time. Nothing here is a ranking, and a molecule is not presented as the cause of the smell.
QUESTIONS ABOUT SUBWAY / METRO
A metro station smells metallic, dusty and warm, with a slightly industrial, oily note and a stale air that moves in gusts. Each arriving train pushes a warmer, dry draught along the platform. The smell is mixed and changing, shaped by people, machines and air flow. It is close to the smell of metal and dust, though heavier and more urban.
In SmellBook’s words: metallic, dusty and industrial.
People meet it on underground platforms, in train tunnels and station concourses, and on stairs leading down from the street. Many people link it with commuting, city life and busy mornings.
Typical settings: underground platform, train tunnel, station concourse.
SmellBook links it to 2 place pages: see them in Connections.
One VERIFIED scientific claim from one published source is recorded for this entry: Solvent compounds in bus and metro interiors. This claim says only what its source supports, in the scope shown with it.
The scientific study behind this evidence is chemistry or emission work, not a study of how the smell is perceived.
It also has one historical source, which records what was written at the time, not a scientific finding: see its historical records.
2 molecules are named in this claim; see the evidence for the role the claim gives them. The molecules this claim names were detected or measured in the study. The claim does not say they shape the smell.
Metro systems vary greatly; this is an editorial urban-environment profile rather than a universal transit smell.
SmellBook records one written comparison with other smells: see it in Connections.
Words that are easy to mix up: Is metallic the same as mineral?
One historical source describes it. It describes its own time, not the present: see its date in Connections; the sources are with the evidence below.
VERIFIED evidence links it to London.
Answers marked EDITORIAL are written by SmellBook editors to describe the experience and add no scientific fact. Answers marked VERIFIED point to claims on published sources, checked against each source's own summary where one was available (each claim's page says how); what each claim supports is in its own text and scope.
Scientific evidence · 1 claim
Conditions or places studied
Solvent compounds in bus and metro interiors
Among nine Hong Kong public transport modes, toluene, ethylbenzene and xylene levels were substantially higher in air-conditioned buses and Mass Transit Railway trains than in the others, which the authors take to suggest additional solvent-related sources in those vehicle interiors.
Five winter months of 2001–02; it measures air composition, not odour, and the levels were within Hong Kong's health-protecting limits.
Also covers: chemistry reported (the claim names compounds or kinds of compounds).
How this was found: Emissions or air measured. What a material, product or place releases into the air was measured, usually without assessing odour. Source: primary study; material-emission work.
Wai-Lun Lau & Lo-Yin Chan
Science of The Total Environment
DOI 10.1016/s0048-9697(02)00647-2Historical evidence · 1 claim
No smell of damp on the first Underground
Describing the first journey along the whole of London's not yet finished Metropolitan Railway, made by invited guests in August 1862, James Hain Friswell wrote that Gower Street station had no smell of damp or confined air and that the air stayed dry and pleasant on that hot day.
One writer's impression of a new line on a single summer journey before it opened; it does not describe the line in regular service.
How this was found: Historical text. A published historical text, read on a digitised page; it records what was written when it was published. Source: historical record.
Passage: p. 362. Describes 30 August 1862, as the passage states; not the present.
James Hain Friswell
Each molecule is named by the claim shown after it. These molecules were detected or measured in the study. About molecules in SmellBook
Links chosen by SmellBook editors, not a ranking.
Associations can vary strongly by person, place and culture.
PATHS FROM HERE
Each step is a relationship SmellBook editors recorded in the knowledge graph, named as it is published there. Paths are not ranked or personalised, and they do not mean the smells smell alike.
Each step is a molecule that a VERIFIED claim names for both smells, in whatever role the claims state. Sharing a molecule does not mean two smells smell alike.
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WHERE THIS SMELL APPEARS
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FOR RESEARCHERS AND EDITORS
Identity, revision history, corrections and how to cite Subway / Metro.
CULTURAL: This entry's associations depend on context, language, memory or culture; its description and smell words are editorial. It says nothing about research or historical evidence; evidence for this entry is shown separately: VERIFIED.
How this entry is identified and named, for citing it or matching it with other records.
SmellBook SB-0050 — Subway / Metrosmellbook:smell:subway-metrohttps://smellbook.com/smells/subway-metroSmellBook. (2026). Subway / Metro (revision 5, 2026-10-06). SmellBook Public Atlas. smellbook:smell:subway-metro. https://smellbook.com/smells/subway-metro@misc{smellbook_subway_metro_r5,
author = {{SmellBook}},
title = {Subway / Metro},
year = {2026},
note = {SmellBook Public Atlas, revision 5, 2026-10-06, smellbook:smell:subway-metro},
url = {https://smellbook.com/smells/subway-metro}
}TY - ENCYC ID - smellbook-subway-metro-r5 TI - Subway / Metro AU - SmellBook T2 - SmellBook Public Atlas PY - 2026 DA - 2026/10/06 ET - revision 5 UR - https://smellbook.com/smells/subway-metro N1 - SB-0050; smellbook:smell:subway-metro; resolver https://smellbook.com/id/smell/subway-metro ER -
The citation names revision 5 of 2026-10-06, so a reader can tell exactly which version was cited. Citing records what was read; it does not grant a licence.
Metro systems vary greatly; this is an editorial urban-environment profile rather than a universal transit smell.
Other entries whose editors linked to Subway / Metro:
Editorial description expanded to answer what it smells like and where you meet it; independently reviewed.
Created 2026-09-22 · Updated 2026-10-06Dataset history In the SmellBook dataset since the first of three dataset releases of 2026-09-30; changed in the first of two dataset releases of 2026-10-05 (descriptors).
No correction notices published for this entry. Corrections policyEVIDENCE MATTERS
SmellBook separates cultural association, community perception, verified evidence, prediction and experimental relationships rather than presenting them as the same thing. Read the evidence guide ↗ See the evidence coverage report ↗