Ann Arbor city ordinances: traffic & air quality data

Technology and Data Michigan 3 Minutes Read ยท published March 01, 2026 Flag of Michigan

Ann Arbor, Michigan publishes traffic and air quality datasets through its official Open Data portal so residents, researchers, and businesses can access city-collected measurements and related metadata. This guide explains where to find traffic counts and monitoring data, how the city and partner agencies enforce relevant rules, how to request additional records, and practical steps to download and cite datasets for analysis.

Where to find the data

Start at the City of Ann Arbor Open Data portal to browse published datasets, API endpoints, and download options for CSV, GeoJSON, and Excel formats. Open Data portal[1]

Penalties & Enforcement

Traffic and air-quality issues in Ann Arbor are enforced by different agencies: parking and moving violations are handled by the Ann Arbor Police Department and Parking Services; local environmental programs and state agencies oversee air quality standards and monitoring. Specific civil or criminal penalties for violations are set by ordinance or state rule and may be stated on the enforcing agency pages cited below.

  • Enforcers: Ann Arbor Police Department for traffic and parking; City Environmental or Sustainability staff for local monitoring programs; Michigan EGLE for statewide air-quality violations. Police contact[3]
  • Controlling instruments: city ordinances and published rules; for data access and published datasets see the City Open Data page. City Open Data information[2]
  • Fines: amounts are not specified on the cited dataset pages; see the enforcing ordinance or state rule for exact figures or check the department enforcement pages. (Not specified on the cited page.)
  • Escalation: first, repeat, and continuing offence procedures are governed by ordinance or statute and are not listed on the dataset landing pages (not specified on the cited page).
  • Non-monetary sanctions: administrative orders, repair or abatement directives, vehicle impound or tow for parking violations, and prosecution in municipal or district court may apply depending on the violation (not specified on the cited page).
Contact the enforcing department early if you receive a notice or wish to dispute a citation.

Applications & Forms

Data access requires no special application to download publicly published datasets from the Open Data portal. If you need non-published records or detailed monitoring reports, submit a public records request to the City Clerk or contact the specific department; fees or form requirements for public records requests are posted on the city site or Clerk's office pages (see Resources).

How datasets are organized

  • Common dataset types include traffic counts, signal timing logs, sensor locations, and time-series air monitoring readings.
  • Traffic datasets often include location, date/time, vehicle class, and direction.
  • Air quality datasets include pollutant concentration, sensor metadata, sampling interval, and QA notes when available.
Use dataset metadata fields to confirm units and sensor time zones before analysis.

Action steps

  • Browse or search the Open Data portal for "traffic" or "air quality" datasets and open the dataset landing page.
  • Use the portal's preview, filter, and download tools to export CSV, GeoJSON, or access the API for programmatic queries.
  • For clarifications on methodology or to request unpublished metadata, contact the publishing department listed on the dataset page.
Document dataset citations and download timestamps for reproducible analysis.

FAQ

How do I download raw traffic count data?
Open the dataset on the City of Ann Arbor Open Data portal and use the "Export" button to download CSV or access the dataset API for programmatic queries.[1]
Can I request historic sensor calibration records?
Yes. Submit a public records request to the City Clerk or contact the department that published the dataset; forms and fee details are on the city websites linked in Resources.

How-To

  1. Go to the City of Ann Arbor Open Data portal and enter "traffic" or "air quality" in the search box.[1]
  2. Open the dataset of interest and read the metadata for fields, units, and last-updated date.
  3. Use the Export menu to download CSV or GeoJSON, or copy the API query URL for automated access.
  4. If you need additional records, follow the dataset contact link or submit a public records request to the City Clerk.

Key Takeaways

  • The Open Data portal is the central source for published traffic and air quality datasets.
  • Enforcement and penalties are set by ordinance or state rule; consult the enforcing department for specifics.

Help and Support / Resources

  1. [1] City of Ann Arbor Open Data portal - data.a2gov.org
  2. [2] City of Ann Arbor - Open Data program page
  3. [3] City of Ann Arbor Police - Contact

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