The MPCA began a special project to monitor air quality in a heavily industrialized area of north Minneapolis in 2013. The project started as part of the MPCA’s process in re-issuing the air quality permit for Northern Metal Recycling, Inc., which operates a metal shredding facility (removed in 2019) south of the Lowry Avenue Bridge on the west bank of the Mississippi River. The project started with one monitor.
The air monitoring sites measure multiple air pollutants including total suspended particulates (TSP), coarse particulates (PM10), and air toxics (metals, VOCs, and carbonyls). The majority of air samples are collected for 24-hours once every six days. PM10 is collected hourly. When the shredder was operating, air monitoring found violations of the state TSP standards, exceedances of the daily PM10 standard, and elevated metals concentrations at the monitors located adjacent to the Northern Metals facility. Since the shredder was removed, those levels have declined.
Under a settlement that Northern Metals and the MPCA agreed to in Ramsey County District Court in March 2017, the company will move its metal shredding operation to a new location in 2019 (more info below).
Map of monitoring sites
- North Minneapolis Air Monitoring Study: 2017 Data summary (aq2-209)
- North Minneapolis Air Monitoring Study: 2016 data summary (aq2-206)
- North Minneapolis Air Monitoring Study: 2015 data summary (aq2-78)
- Fine particle study results: North Minneapolis 2013-2014
Data reports (updated quarterly)
- North Minneapolis Air Pollution Monitoring Results (aq2-75)
- North Minneapolis Air Data Explorer — interactive data viewer
- For additional data requests, complete an Information Request Form (e-admin11-36).
What the MPCA is doing
The MPCA is actively working to address the elevated air pollution levels in the area surrounding these monitors.
Air monitoring is continuing at the Lowry Avenue and Pacific Street sites (sites 909 and 910, respectively) and the MPCA is providing timely public access to results. In 2017, the agency added a third air-monitoring site on the east side of the Mississippi River in the Marshall Terrace neighborhood at 2522 Marshall St. NE.
In addition to addressing Northern Metals, the MPCA has worked with the city of Minneapolis to identify other sources in the area that may be contributing to elevated air pollution levels, and to have these facilities take pollution-reduction measures to improve air quality. These activities include increasing the frequency of site and street spraying and sweeping, moving activities indoors, and changing material-handling practices.
Northern Metal Recycling was ordered by Ramsey County District Court to cease operation of the Metals Recovery Plant effective September 2, 2016. Subsequently, on February 28, 2017, Northern Metals, the MPCA and the City of Minneapolis signed a court-overseen agreement (Consent Decree) requiring the facility to relocate its shredding operation by no later than August 1, 2019. On July 18 2019, the MPCA announced it would not grant Northern Metal Recycling's request to extend the shut-down date for its shredding operations in North Minneapolis to October 1, 2019.
The company disputed the decision and invoked their right to pursue dispute resolution with MPCA, an option available to them under the 2017 consent decree. On July 25, while the dispute resolution was still underway, the company requested court intervention to allow them to continue operation after August 1. On July 30, the Ramsey County District Court issued an order that allowed Northern Metals to continue operating after August 1, while Northern Metals and MPCA engaged in the dispute resolution process.
The MPCA reached a settlement agreement with Northern Metal Recycling regarding its errors in reporting emissions records. Northern Metal Recycling permanently shut down the shredder on Sept. 23, 2019 and paid a civil penalty.