Diesel Equipment Idle and Air Quality Audit

Inspection template for auditing diesel equipment idling, diesel particulate matter controls, and air quality compliance in tunnel construction and other enclosed environments.

Site Scope and Exposure Conditions

• Inspection area identified as tunnel, shaft, basement, or other enclosed work zone
• Number of diesel-powered units operating in the area
• Observed idling duration exceeds site limit
• Work activity and diesel equipment use match the approved air quality plan
• Current ventilation configuration documented
• Photo of the work zone and equipment layout

Diesel Idling Controls

• Engine idle limit posted and visible to operators
• Observed equipment shut down when not actively in use
• Exceptions to no-idle rule are justified and documented
• Operator understands idle-reduction requirements
• Automatic idle shutdown or telematics idle tracking enabled where required
• Idle violations observed during inspection

Diesel Particulate Matter and Emissions Controls

• Engines appear free of excessive visible smoke
• Diesel particulate filters, oxidation catalysts, or other exhaust controls installed as required
• Exhaust control devices show no visible damage, leaks, or bypass conditions
• Engine maintenance records available and current
• Fueling and fluid leaks present
• Visible dust or soot accumulation around exhaust outlets and equipment

Ventilation and Air Monitoring

• Mechanical ventilation operating in the inspection area
• Ventilation airflow is directed to remove diesel exhaust from workers' breathing zone
• Air monitoring results available for diesel particulate matter or other site-specified contaminants
• Measured contaminant levels within site action limits
• Air monitoring frequency meets the site exposure assessment plan
• Ventilation equipment condition

Worker Protection and Housekeeping

• Required respiratory protection is available and used where indicated by the exposure assessment
• Workers in the area are wearing required PPE
• Housekeeping prevents dust buildup that could compound diesel exposure
• Combustible materials and waste are controlled away from exhaust sources
• Worker complaints or symptoms related to exhaust exposure reported

Corrective Actions and Closeout

• All deficiencies documented with responsible person and due date
• Immediate controls implemented for any critical item failure
• Follow-up inspection scheduled
• Inspector signature