Fugitive dust monitoring requirements in Chicago vary by operation, location, and permit conditions. If you have been asked to monitor, or are wondering whether you should be, this overview explains the rules, the facility types typically required to monitor, and what compliance involves.
What is Fugitive Dust?
Fugitive dust is airborne particulate matter that escapes into the surrounding environment from outdoor industrial activities. Chicago regulations focus on particulate matter with a diameter of ten micrometers or smaller (PM10), because they are fine enough to enter the respiratory system and impact human health. In a city where industrial operations routinely border residential neighborhoods, schools, and hospitals, controlling what leaves your site matters. That said, Chicago’s regulations do not penalize facilities for generating dust. They set defined thresholds for what leaves your property, and crossing those thresholds is what triggers your compliance obligations.
Who’s Watching
Fenceline PM10 monitoring in Chicago is overseen primarily by the Chicago Department of Public Health (CDPH), which enforces local air quality regulations and permit conditions. These requirements are built on federal standards established by the EPA, particularly the National Ambient Air Quality Standards (NAAQS) for PM10. In practice, oversight also comes from the surrounding community, where complaints and visible dust emissions can trigger inspections and enforcement action.
Is Your Facility Affected?
Monitoring obligations are tied to specific types of operations. Facilities and operations involved in high-dust activities, particularly those handling large volumes of material or operating in open environments, are the most likely to require monitoring under CDPH rules.
Large recycling facilities
These are facilities that process high volumes of recyclable material or operate high-capacity equipment such as metal shredders exceeding 25 tons per hour. Recycling activities conducted at permitted waste transfer stations are not included in this category.
Reprocessable construction and demolition material facilities
Often referred to as “rock-crushing” operations, these facilities accept and process construction and demolition debris into reusable materials. Common inputs include concrete, brick, asphalt, wood, and metals. Materials contaminated with hazardous substances like lead or asbestos are excluded.
Aggregate and bulk material storage operations
These operations store large quantities (25 cubic yards or more) of non-packaged solid materials that can become airborne, such as sand, gravel, or ores. Materials are typically stored outdoors or in open conditions, increasing the potential for wind-driven emissions. Certain materials, such as salt, grain, and permitted recyclables, are excluded.
Complex demolitions and demolitions by implosion
This category includes demolition projects involving large, structurally complex, or higher-risk buildings, such as taller structures, those with deep foundations, or those located close to property lines. It also includes demolitions using specialized methods like wrecking balls or explosives, as well as projects designated as complex based on site-specific risks.
It is important to note that CDPH is not limited to these categories. The department has the authority to require any facility or operation to monitor PM10 if it determines that the activity poses a risk to surrounding air quality.
What PM10 Monitoring Looks Like Under CDPH
The Chicago Department of Public Health (CDPH) has established detailed PM10 monitoring requirements under the city’s air quality regulations, including Municipal Code Section 2-112-110. Through strong emphasis on fenceline monitoring and rapid response, these rules are designed to ensure that dust leaving a facility does not impact surrounding communities.
Reportable Action Levels
A central concept in CDPH’s framework is the Reportable Action Level (RAL). The RAL is a threshold that requires facilities to take action to reduce dust emissions when exceeded. Thresholds and response timelines vary by facility type and across permit requirements.
For recycling facilities, construction and demolition material facilities, and demolition sites, the RAL is set at 150 micrograms per cubic meter (150 µg/m³) measured as a 15-minute average. If that threshold is reached, facilities must notify CDPH within 15 minutes and implement a dust mitigation action plan, which may include reducing operations or suspending them entirely.
Aggregate and bulk material storage operations follow a different standard. Rather than a 15-minute average, the RAL is calculated over a 24-hour period, consistent with federal NAAQS standards. The specific threshold varies by facility and is defined in individual permit conditions, but generally falls in the range of 150 µg/m³. Facilities have 24 hours to report once the level is reached.
Fenceline Monitoring
CDPH requires monitoring at the fenceline, meaning data must reflect what is leaving the property. Equipment requirements vary by operation.
Aggregate and bulk material facilities are required to use Federal Equivalent Method (FEM) monitors. Facilities handling manganese-bearing materials must use Federal Reference Method (FRM) sampling, at a location specified in a CDPH-approved metals monitoring plan. Collected filters follow the EPA 3-day monitoring schedule and are sent off-site for gravimetric analysis and manganese quantification using a current EPA-listed analytical method.
Recycling, construction and demolition material facilities, and demolition sites, must use continuous, near-real-time monitors meeting near-reference performance standards. Equipment must include an omnidirectional heated inlet, a sample pump and flow controller, and a data logger capable of time-resolved measurements. Additionally, demolitions by implosion require continuous PM10 monitoring one week before and one week after the event.
Meteorological Monitoring
All facilities must operate a meteorological station to continuously track wind speed and direction, which is critical for determining upwind and downwind conditions. For permanent and fixed operations, the station must be installed at an unobstructed location at a minimum height of 10 meters, centrally positioned relative to site operations. Non-permanent operations, such as complex demolitions and demolitions by implosion, are not subject to the 10-meter height requirement
Data, Reporting, and Compliance
Per CDPH, facilities must collect data consistent with EPA units and quality assurance standards and maintain continuous records with attached data loggers. Reporting timelines vary by monitor type. Continuous monitor data, including PM10 readings for each monitor alongside corresponding meteorological data formatted to CDPH specifications, is due within 14 days of the end of each reporting month. For manganese-bearing bulk material facilities, raw laboratory data from the filters collected from FRM sampling must be submitted within 28 days of the end of each reporting month.
CDPH can also monitor facility data in real time using Envirosuite, a platform that tracks PM10 readings alongside wind speed and wind direction. Envirosuite gives CDPH continuous visibility into whether emissions are reaching surrounding communities.
CDPH also retains authority to require additional monitoring beyond these baseline requirements if continuous data alone is not considered sufficient to assess health impacts.
Enforcement
The Chicago Department of Public Health has broad enforcement. The Commissioner of Public Health can conduct facility inspections, issue subpoenas compelling the production of monitoring data and records, and order cease-and-desists if PM10 levels pose an imminent threat to public health.
CDPH has broad discretion in how it applies monitoring requirements across facility types. The department is not strictly bound to apply a single set of rules to a specific type of facility. They may draw on elements from different regulatory frameworks as they deem appropriate. For example, a facility that would not typically be subject to near-real-time monitoring requirements, for example, could still be required to meet that standard based on its location, operating history, or potential community impact. This flexibility means that permit conditions and direct engagement with CDPH often matter as much as the baseline rules themselves.
PM10 Monitoring Requirements by Facility Type
| Facility type | RAL threshold | Averaging period | Notify CDPH | Report interval | Monitor required | Special conditions |
|---|---|---|---|---|---|---|
| Recycling (large facilities, >25 t/hr) | 150 µg/m³ | 15-min | Within 15 min | 15-min | Continuous near-real-time; near-reference standard | — |
| C&D materials (rock-crushing operations) | 150 µg/m³ | 15-min | Within 15 min | 15-min | Continuous near-real-time; near-reference standard | — |
| Aggregate storage (≥25 cubic yards) | ~150 µg/m³* | 24-hr | Within 24 hrs | Hourly | Federal Equivalent Method (FEM) | Manganese-bearing materials require Federal Reference Method (FRM) sampling, followed by off-site filter analysis for manganese |
| Complex demolitions/Demolitions by implosion | 150 µg/m³ | 15-min | Within 15 min | 15-min | Continuous near-real-time; near-reference standard | May require continuous monitoring 1 week before and after the event |
*RAL thresholds for aggregate storage facilities may vary.
Not Sure Where You Stand?
If any of this raises questions you cannot clearly answer, it warrants a closer look. A permit review and a straightforward assessment of your operations can help identify gaps before they become compliance findings.
CleanAir Engineering helps Chicago facility managers understand their PM10 obligations and put the right monitoring program in place. Reach out to schedule a one-on-one consultation.
Sources:
City of Chicago. (2025). Municipal Code of Chicago, Chapter 2-112: Department of Public Health. American Legal Publishing. https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2602628
Chicago Department of Public Health. (April 2021). Rules for demolitions by implosion and complex demolitions. City of Chicago.
Chicago Department of Public Health. (June 2020). Rules for Large Recycling Facilities. City of Chicago.
Chicago Department of Public Health. (January 2019). Control of emissions from handling and storing bulk materials. City of Chicago.
