Environmental Compliance

EPA Standards for Industrial Dust Emissions

PM10 and PM2.5 Standards (National Ambient Air Quality Standards - NAAQS)

• PM10: Particulate matter 10 microns or smaller
• 24-hour limit: 150 µg/m³
• Annual limit: 50 µg/m³
• Applies to outdoor air quality downwind of facility

PM2.5: Fine particulate matter 2.5 microns or smaller

• 24-hour limit: 35 µg/m³
• Annual limit: 12 µg/m³
• More stringent - requires higher dust collection efficiency

National Emissions Standards for Hazardous Air Pollutants (NESHAP)

• Special standards for hazardous materials (heavy metals, etc.)
• Applies if facility processes or produces hazardous materials
• Requires specific collection equipment and stack testing
• Limits determined case-by-case

Title V Air Quality Permits

When Required:

• Facilities classified as Major Sources (emit 100+ tons any pollutant annually)
• Facilities in nonattainment areas (don't meet NAAQS)
• Facilities with aggregate potential emissions >25 tons
• Any facility subject to NESHAP

Permit Application Contents:

• Detailed description of dust collection equipment
• Emission calculations and test data
• Monitoring and compliance procedures
• Maintenance and recordkeeping plans
• Stack test protocol and frequencies

General Permits (Smaller Facilities)

• Simplifi applicability criteria available
• Requirements vary by state and locality
• May require annual certification of compliance
• Check with state environmental agency

Stack Testing (Source Testing)

EPA Method 5 - Particulate Matter Sampling

• Industry standard for measuring dust collector outlet emissions
• Isokinetic sampling probe collects particulates
• Samples analyzed gravimetrically (by weight)
• Results in mg/dscm (milligrams per dry standard cubic meter)

Testing Frequency

• Initial test: Required during permit application
• Compliance tests: Every 1-3 years typically (permit-specific)
• Special tests: After major equipment changes
• Cost: $2,000-5,000 per test (including report)

Continuous Monitoring Systems

• Optical monitors provide real-time outlet dust concentration
• Required for larger facilities or hazardous materials
• Alarms alert when emissions exceed permitted levels
• Data automatically recorded and reported

Variations by Jurisdiction

Environmental regulations vary significantly by location. Key considerations:

• Attainment Status: Nonattainment areas have stricter requirements
• State-Specific Rules: Many states have standards MORE stringent than federal
• Local Ordinances: Cities/counties may impose additional limits
• Grain Handling Rules: Specific to grain/food processing dust
• Fugitive Dust: Dust leaving the property must be minimized

Compliance Assessment Steps:

1. Contact your state air quality agency
2. Determine if facility requires permit
3. Obtain copy of applicable standards
4. Perform emission calculations or stack testing
5. Design system to comply with limits
6. Submit permit application if required
7. Maintain documentation and test records

System Design for Environmental Standards

Emission Reduction Strategies:

• High-efficiency collection: 99%+ collection efficiency minimizes emissions
• HEPA filtration: 99.97% efficiency for submicron particles
• Proper ductwork: No fugitive dust from leaks
• Enclosed design: Enclosures prevent dust escape
• Air sealing: All connections sealed (no bypass air)

Example: Compliance Scenario

Facility processes 50 tons of abrasive per day.

Required Records for Compliance:

• Air quality permit (if applicable)
• Stack test reports and dates
• Maintenance logs and inspection records
• Filter replacement schedule and dates
• Emission monitoring data (if continuous monitors)
• Equipment specifications and performance ratings
• Correspondence with environmental agencies

Record Retention:

• Permit compliance records: 5+ years (check local requirements)
• Stack test reports: Permanently archived
• Maintenance records: Minimum 3-5 years
• Digital and physical copies recommended