Permanent project revision

SIMAT Air Monitoring and the Valley of Mexico Contingency Programme

Revision 2026-08-20-source-dates · effective 2026-07-26

Current revision. This is the snapshot used by the live entity page.

unreviewed

Created the first structured Evidence Passport with 1 claim and 10 source dossiers.

sha256:df26edbf23c8f69eb2dba9f4e8fc5c1ca9a6877ddd566abafefd26eb1301eb15

All revisions → Current entity page →

Change set

add /evidencePassport — Added claim-level evidence mapping and source dossiers.
add /revisionHistory — Established a permanent, hash-addressed baseline revision.

1: of 1 claims mapped
10: source dossiers
8: publication dates recorded
1: archives linked
0: exact locators
0: content captures hashed

Claims, one by one

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-5887d055c8893288 quantitative

Particulate pollution across Mexico City has fallen 60.4% since the 1990 ProAire programme began, which AQLI (University of Chicago) puts at 3.3 years of life expectancy

Published field: impact · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: No support note recorded
Caveat: The impact itself notes this is the long-run policy mix (unleaded fuel, catalytic converters, fuel switching, transit), not the contingency mechanism, whose emergency lever shows no measurable air-quality benefit in peer-reviewed work.

Sources carrying this claim

Mexico City: ProAire (1990) — Air Quality Life Index, EPIC, University of Chicago (independent)

Source dossiers and revision state

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-08-20-source-dates effective 2026-07-26 · created 2026-08-20

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:df26edbf23c8f69eb2dba9f4e8fc5c1ca9a6877ddd566abafefd26eb1301eb15

Revision history → Permanent version link → Machine-readable record → Evidence Constitution →

1: of 1 claims mapped
10: source dossiers
8: publication dates recorded
1: archives linked
0: exact locators
0: content captures hashed

Governance facts carried by the record

Operator: SIMAT / SEDEMA Mexico City (monitoring); CAMe, Comision Ambiental de la Megalopolis (declares contingencies)
Actor types: city-government, regional-government
Funding model: public
Funding description: Not recorded
Cost: Not recorded
Ownership: Not recorded
Decision rights: Not recorded
Exit conditions: Not recorded

10 source dossiers

SIMAT — Direccion de Monitoreo Atmosferico, SEDEMA CDMX (operator) aire.cdmx.gob.mx · background

Open original source ↗

Stable source ID: src-47984d6448b0a1d5
Publisher: Name not classified · aire.cdmx.gob.mx
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Operator site for the network and the hourly index. Returned 503 to automated fetching throughout this review; content verified indirectly. Do not cite a data licence from it — none was readable.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

La situacion actual del sistema de monitoreo ambiental en la ZMVM — Investigaciones Geograficas, UNAM (peer-reviewed) scielo.org.mx · background

Open original source ↗

Stable source ID: src-201abc1db9283292
Publisher: Name not classified · scielo.org.mx
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Network history: 'En 1966 ... se instalo la primera red de monitoreo con 4 estaciones con equipos manuales'; 'En 1986 se inicio la operacion de la Red Automatica de Monitoreo Atmosferico (RAMA) con 25 estaciones y equipos automaticos para medir monoxido de carbono, dioxido de azufre, oxidos de nitrogeno y ozono' (In 1966 the first monitoring network was installed with 4 manual stations; in 1986 RAMA began operating with 25 automatic stations measuring CO, SO2, NOx and ozone).
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Acuerdo — Programa para Prevenir y Responder a Contingencias Ambientales Atmosfericas en la ZMVM, Periodico Oficial del Estado de Mexico, 28 May 2019 (instrument) legislacion.edomex.gob.mx · background

Open original source ↗

Stable source ID: src-0b5472fb6f78d2eb
Publisher: Name not classified · legislacion.edomex.gob.mx
Type / language: pdf · language not classified
Published: 2019-05-28
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
The governing instrument, published the same day in the Gaceta Oficial de la CDMX and the Periodico Oficial del Estado de Mexico. File exists at this URL; direct fetch returned 503 during review, so the thresholds and measures below are sourced from the CAMe communiques that apply it.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Contingencias ambientales en el valle de Mexico: guia basica — Grupo Animal (independent explainer) grupoanimal.mx · background

Open original source ↗

Stable source ID: src-bc3793a4e4b7745a
Publisher: Name not classified · grupoanimal.mx
Type / language: web-page · language not classified
Published: 2026-03-22
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Threshold, verbatim: Phase I activates at 'concentraciones de ozono superiores a 155 ppb (partes por billon)' (ozone concentrations above 155 ppb), against an air-quality standard of 'no rebasar 90 partes por billon, durante una hora'. Also documents that the trigger has been progressively lowered since 1990, never raised.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Se mantiene la Fase I de contingencia ambiental en ZMVM — News Report MX, reproducing the CAMe communique (press) newsreportmx.com · background

Open original source ↗

Stable source ID: src-607e83083d5487b0
Publisher: Name not classified · newsreportmx.com
Type / language: web-page · language not classified
Published: 2026-02-13
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
The mandatory measures, verbatim from the CAMe communique: industry 'reduciran el 40% de sus emisiones de precursores de ozono' (will cut ozone-precursor emissions by 40%); the Miguel Hidalgo refinery at Tula 'no operara a mas del 75% de capacidad del total de proceso'; the Francisco Perez Rios thermoelectric plant 'Reduccion del 30% del consumo de combustoleo'; private vehicles off the road 'de las 5:00 a las 22:00 horas'.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Activan contingencia ambiental por ozono en la ZMVM: restricciones y doble Hoy No Circula — TV Azteca (press) tvazteca.com · background

Open original source ↗

Stable source ID: src-6202143141e6282f
Publisher: Name not classified · tvazteca.com
Type / language: web-page · language not classified
Published: 2026-01-08
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Declaring body and a worked example: the 'Comision Ambiental de la Megalopolis (CAMe)' activated Phase 1 on a 'concentracion maxima de ozono' of 160 ppb at the Cuajimalpa (CUA) station, banning hologram 2 vehicles outright plus hologram 1 and 0/00 by plate digit, 05:00 to 22:00.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Saturday Driving Restrictions Fail to Improve Air Quality in Mexico City — Davis, Scientific Reports (2017) (peer-reviewed) nature.com · background

Open original source ↗

Stable source ID: src-142cf226d14bd860
Publisher: Name not classified · nature.com
Type / language: web-page · language not classified
Published: 2017-02-02
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Finds the Saturday expansion of Hoy No Circula had virtually no discernible effect on pollution across eight major pollutants, against ex-ante predictions of a 15%+ emissions cut. nature.com blocked automated fetching (auth redirect); finding confirmed at title and abstract level.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Driving Restriction and Air Quality in Mexico City — Resources for the Future, on Davis, Journal of Political Economy (2008) (independent) resources.org · background

Open original source ↗

Stable source ID: src-d95c6fcb1d70fd51
Publisher: Name not classified · resources.org
Type / language: web-page · language not classified
Published: 2008-08-18
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Verbatim: 'When hourly air pollution records from monitoring stations were examined, they showed no evidence that the program has improved air quality'; mechanism: 'no one got out of their cars. Instead, the evidence indicates that HNC has led to an increase in the total number of vehicles in circulation', many of them high-emission used imports.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Mexico City: ProAire (1990) — Air Quality Life Index, EPIC, University of Chicago (independent) aqli.epic.uchicago.edu · 1 linked claim

Open original source ↗

Stable source ID: src-4bb2673671ea07ec
Publisher: Name not classified · aqli.epic.uchicago.edu
Type / language: web-page · language not classified
Published: 2023-08-23
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: Open archived copy ↗ · 2026-07-08
Content hash: No captured content hash
Locator: Open the recorded source note
Verbatim: 'particulate pollution has declined by 60.4% since the introduction of the 1990 ProAire policies'; 'In terms of life expectancy, that implies a difference of 3.3 years'. AQLI credits the ProAire policy sequence (catalytic converters, unleaded petrol, fuel switching, transit), not the contingency programme.
Descriptive only — not page/paragraph exact
Claims linked: clm-5887d055c8893288

Spatio-Temporal Representativeness of Air Quality Monitoring Stations in Mexico City — Frontiers in Public Health (2020) (peer-reviewed) frontiersin.org · background

Open original source ↗

Stable source ID: src-51adc4848f86f3cf
Publisher: Name not classified · frontiersin.org
Type / language: web-page · language not classified
Published: 2020-11-09
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Independent test of network coverage over 49 SIMAT stations and nine pollutants, 2009-2018. Verbatim: 'the distribution and the number of the monitoring stations is sufficient to evaluate the majority of pollutants, with the exception of sulfur dioxide (SO2)', where the shortfall is 'constrained to the southern part' of the city.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Known limits of this passport

Publisher names and source languages have not yet been classified; domains are recorded without guessing.
Existing source notes are descriptive locators, not page- or paragraph-exact citations.
A missing archive, publication date or content hash is shown as null rather than inferred.
The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim.