Case Study

Odor pollution control network in Des Moines, Iowa

City of Des Moines
Sector:

Need

The City of Des Moines is Iowa’s capital city and our 17 departments serve more than 214,000 residents and 49 neighborhood associations. Des Moines is a leader in sustainability and provides its residents with vibrant neighborhoods, an alive and active downtown, and abundant leisure opportunities.

People who live and work in downtown Des Moines had long complained about foul odors, and the city also had little success in controlling the problem.

Municipal staff received about 200 odor complaints per year, and most of the odors were described as “putrid, cooking meat and sewage odors”. The methodology used so far to control odor episodes was subjective and unscientific.

In 2022, Des Moines officials hired an air quality consulting firm to conduct a study to analyze odor complaints over the past decade and identify potential sources of the problem. Following the study, it was determined that three industrial meat companies in east Des Moines were the sources of the odors.

The study also recommended solutions to the city such as the purchase of odor monitoring devices and the implementation of an odor threshold that would prompt businesses to make actions if odors reach a certain level.

The City of Des Moines is taking a data-driven approach to reducing ongoing odor problems and establishing thresholds with the help of Kunak’s odor detection and control technology provided by Envirosuite.

The city's new odor control system uses multiple real-time data points to measure levels of chemical compounds in the air.
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Solution

After identifying the top three odor emitters, in October 2023, the Neighborhood Inspections team commissioned Envirosuite, a global leader in environmental consulting services, to install 10 Kunak AIR Pro odor monitors at various locations around the top three odor emitters identified by the study and to install a weather station on the rooftop of the Municipal Service Center 2 (MSC 2) located on Maury Street.

This monitoring device network accurately measures and records data based on odor-producing chemicals (H2S, NH3, and VOCs).

Once calibrated, the odor monitors immediately began providing the city’s Envirosuite panel with real-time data measuring the levels of chemical compounds. Weather data is collected at the center of each monitor and communicated to the weather station. This data is also communicated to the Envirosuite platform and allows modeling of odor plumes.

From the control panel, users can see where the odor is traveling and detect the most likely source of emission.

Results

The odor monitors measure the levels of chemical compounds in the air, such as ammonia, hydrogen sulfide and volatile organic compounds. The information collected by the monitors is sent to a database, where it is combined with the city’s meteorological and odor complaint data, providing more accurate information on where are the odors coming from and where are they going.

This is a more proactive and data-driven method than a scentometer, a device that measures odors based on the number of times the air would have to be diluted to smell as if there were no odor.

The solar panel-powered odor monitoring devices provide real-time data on odors from odor emitters and connect to the Envirosuite platform via a 5G cellular connection.

According to Dalton Jacobus, Des Moines’ neighborhood inspections administrator, the data obtained with the technology over the next six months will be used to guide future odor policies and set thresholds for odor emissions from industrial facilities, as well as achieve voluntary compliance with existing regulations by those companies causing odor episodes.

Project details

Customer: City of Des Moines

User: City of Des Moines

Location: Des Moines, Iowa

Sector:

Year: 2024

Parameters:

  • Hydrogen sulfide
  • Ammonia
  • Volatile organic compounds
  • Wind speed and direction

Solutions

  • AIR ProProfessional air quality monitoring station
    Air quality monitor

    AIR Pro

    The most accurate air quality monitoring station

    SENSOR-BASED | BEST AVAILABLE ACCURACY

    Benefits

    • Multi-pollutant
    • Smart cartridge system
    • Fully autonomous
    • Real-time data
    • Proven accuracy
    See more
  • AIR CloudAir quality software
    Air quality software - Kunak AIR Cloud

    AIR Cloud

    Multipurpose air quality software for professionals

    REAL-TIME DATA | ALWAYS UPDATED

    Benefits

    • Secure and condifential
    • Air quality reporting
    • Advanced data analysis and visualisation
    • Reliable data guaranteed
    • Data sharing and integration
    See more
  • Hydrogen sulfide sensorReliable real-time data on H2S
    Hydrogen-sulfide

    Hydrogen sulfide sensor

    Reliable information about hydrogen sulfide

    GASPLUG TECHNOLOGY | PATENTED DESIGN

    Specs

    • Electrochemical
    • R2 >0.8
    • Range: 0-2,000 ppb (Type A) | 0-20 ppm (Type B)
    • Resolution: 1 ppb (Type A) | 0.01 ppm (Type B)
    • 24 months of operating life
    See more
  • AmmoniaReliable real-time data on NH3
    Ammonia

    Ammonia

    Reliable information about ammonia

    GASPLUG TECHNOLOGY | PATENTED DESIGN

    Specs

    • Electrochemical
    • Typical accuracy (MAE): ±0.3 ppm
    • Range: 0-50 ppm
    • Resolution: 0.01 ppm
    • 24 months of operating life
    See more
  • Volatile organic compoundsReliable real-time data on VOCs
    Volatile_organic_compounds

    Volatile organic compounds

    Reliable information about volatile organic compounds

    GASPLUG TECHNOLOGY | PATENTED DESIGN

    Specs

    • Photoionization detector
    • R2 >0.99
    • Range: 0-3,000 ppb (Type A) | 0-40 ppm (Type B)
    • Resolution: 1 ppb (Type A) | 0.01 ppm (Type B)
    • 10,000 hours of operating life
    See more
Air quality monitor

AIR Pro

The most accurate air quality monitoring station

SENSOR-BASED | BEST AVAILABLE ACCURACY

Benefits

  • Multi-pollutant
  • Smart cartridge system
  • Fully autonomous
  • Real-time data
  • Proven accuracy
See more
Air quality software - Kunak AIR Cloud

AIR Cloud

Multipurpose air quality software for professionals

REAL-TIME DATA | ALWAYS UPDATED

Benefits

  • Secure and condifential
  • Air quality reporting
  • Advanced data analysis and visualisation
  • Reliable data guaranteed
  • Data sharing and integration
See more
Hydrogen-sulfide

Hydrogen sulfide sensor

Reliable information about hydrogen sulfide

GASPLUG TECHNOLOGY | PATENTED DESIGN

Specs

  • Electrochemical
  • R2 >0.8
  • Range: 0-2,000 ppb (Type A) | 0-20 ppm (Type B)
  • Resolution: 1 ppb (Type A) | 0.01 ppm (Type B)
  • 24 months of operating life
See more
Ammonia

Ammonia

Reliable information about ammonia

GASPLUG TECHNOLOGY | PATENTED DESIGN

Specs

  • Electrochemical
  • Typical accuracy (MAE): ±0.3 ppm
  • Range: 0-50 ppm
  • Resolution: 0.01 ppm
  • 24 months of operating life
See more
Volatile_organic_compounds

Volatile organic compounds

Reliable information about volatile organic compounds

GASPLUG TECHNOLOGY | PATENTED DESIGN

Specs

  • Photoionization detector
  • R2 >0.99
  • Range: 0-3,000 ppb (Type A) | 0-40 ppm (Type B)
  • Resolution: 1 ppb (Type A) | 0.01 ppm (Type B)
  • 10,000 hours of operating life
See more