Resources: Air Monitoring, Noise, ISO and TRI Reporting Guides

These guides cover the four areas we work in: air monitoring, noise, ISO 14001 and ISO 45001, and Toxics Release Inventory (TRI) reporting. Each guide cites the official source it is based on at the bottom of the page, so you can check it against the current text yourself.

Looking for a quick answer? Start with the questions and answers.

Air monitoring

• ADOSH Consultation vs a Private Industrial Hygiene Consultant ADOSH offers free on-site air and noise monitoring to some Arizona employers. See what the program provides, its limits, and when a private firm fits better.
• Area vs Personal Air Sampling: When to Use Each A personal sample measures one worker's breathing zone exposure. An area sample measures the air at one location. See which one OSHA's standards call for.
• Employee Exposure Records: Retention and Access How long OSHA requires you to keep exposure, medical and noise records, where the 30-year answer is wrong, and who has a right of access to them.
• Exposure Above the PEL: What to Do Next When air monitoring results exceed OSHA's PEL, four obligations start at once. See the 15-day employee notification, the controls, and when to monitor again.
• How Many Air Samples Do You Need for Exposure Monitoring? Sample count depends on the number of similar exposure groups, not headcount. See how exposure groups and sampling strategy set the size of a survey.
• How to Calculate an 8-Hour TWA (Time-Weighted Average) The 8-hour TWA formula with worked examples for an 8-hour and a 12-hour shift, and the calculation errors that make an overexposure look like a pass.
• How to Read an Industrial Hygiene Report The result is not the whole industrial hygiene report. See what a defensible air monitoring report must contain and five questions to ask about yours.
• Is Air Monitoring Still Required If Workers Wear Respirators? Almost certainly yes. Respirators do not replace air monitoring. See what OSHA's respiratory protection standard requires and why you need a measured exposure.
• Objective Data in Place of Exposure Monitoring Several OSHA standards accept objective data in place of air sampling. See which ones allow it, what qualifies, and where cadmium and lead differ.
• OSHA Air Monitoring Survey Cost: What Drives the Price Four factors set the cost of an air monitoring survey. See what moves it up or down, how to read a quote, and when you may not need sampling at all.
• OSHA Citation for No Exposure Monitoring: What to Do Cited for not conducting exposure monitoring? See which standard you were cited under, how to plan around the abatement date, and what records OSHA expects.
• OSHA Exposure Monitoring Frequency by Substance OSHA sets no single air monitoring schedule. See monitoring frequency, stop conditions, notification deadlines and record retention for nine substances.
• OSHA PEL vs ACGIH TLV: What the Gap Means Most OSHA PELs date from 1971. See how they compare with current ACGIH TLVs and NIOSH RELs, and why a sound air monitoring report shows you both.
• Similar Exposure Groups (SEGs) and Air Monitoring Cost Air monitoring cost depends on how many similar exposure groups (SEGs) your workforce divides into. See how SEGs are defined and how many samples each needs.
• Why Most OSHA PELs Are Outdated Most OSHA PELs date from 1971. Learn why they were never updated, which limits are enforceable today, and what that means for your air monitoring results.

We also have a page for each substance we sample for, from silica to welding fume. → See every air monitoring page

Noise

• Hearing Protector Selection: NRR Derating and Beyond The NRR on the package is a laboratory figure. See how OSHA and NIOSH derate it, a worked example, and when octave band analysis of your noise matters.
• Industrial Noise Survey Cost: What Drives the Price What you pay for in an OSHA noise survey, what moves the price up or down, and the recurring hearing conservation program costs that can follow the results.
• Noise Dosimetry: How Many Employees Do You Need to Sample? OSHA's noise standard sets no sample size. See the worked noise dose math, what splits a similar exposure group, and how many dosimeters a survey takes.
• OSHA Hearing Conservation Program Requirements When OSHA's noise standard requires a hearing conservation program, the seven required elements, and the audiometric testing deadlines that get missed.
• Standard Threshold Shift (STS): What It Is, When to Record It How OSHA defines a standard threshold shift, the follow-up duties and deadlines it triggers, and when the case becomes recordable on the OSHA 300 log.
• What a Noise Survey Report Should Contain A 12-item checklist for evaluating a workplace noise survey report, plus five quick questions to test the report you already have.

ISO 14001 and ISO 45001

• Can Your Certification Body Also Provide ISO Consulting? No. Under ISO/IEC 17021-1, the certification body that audits you for ISO 14001 or ISO 45001 cannot build your management system. See what it can offer.
• Environmental Aspects and Impacts Register for ISO 14001 How to build an ISO 14001 environmental aspects and impacts register: where the rows come from, how to set significance criteria, and how to keep it current.
• ISO 14001 and ISO 45001 Certification Cost and Timeline ISO certification carries three separate costs, and one phase of the schedule cannot be compressed. See what drives the cost and the timeline up or down.
• ISO 14001 and ISO 45001 Integrated Management System One integrated management system can cover ISO 14001 and ISO 45001. See which clauses you build once, where the savings come from, and where there are none.
• ISO 14001 Clause Guide: Requirements Clause by Clause A clause-by-clause guide to the main ISO 14001 requirements, what moved in the 2026 edition, and which clause numbers to verify before you cite them.
• ISO 14001:2026 Transition: What Changed and What to Do ISO 14001:2015 was withdrawn in April 2026. See what changed in the 2026 edition, how the transition timeline works, and what to do first.
• ISO 45001 Clause 5.4: Worker Consultation and Participation ISO 45001 Clause 5.4 requires consultation and participation of workers. See what the clause requires and which records demonstrate it.
• ISO 45001 Clause Guide: Requirements Clause by Clause A clause-by-clause guide to the ISO 45001 requirements that matter most, where audits raise findings, and what the coming revision means for you.
• ISO Stage 1 and Stage 2 Certification Audits: What to Expect What the certification body reviews at the Stage 1 and Stage 2 audits for ISO 14001 and ISO 45001, what happens after each stage, and how to prepare.
• Outsourced Internal Audits for ISO 14001 and ISO 45001 Who can perform your ISO 14001 or ISO 45001 internal audits, what the standards actually require, and when you do not need outside help.
• US Compliance Obligations Register for ISO 14001 The US federal, state and local requirements that belong on an ISO 14001 compliance obligations register, what each entry needs, and three mistakes to avoid.

TRI reporting (Form R)

• Arizona Pollution Prevention Plan and Toxic Data Report Arizona facilities that file Form R also owe ADEQ a Toxic Data Report by July 1 and a pollution prevention plan on a later date. See what is due and where.
• Calculating TRI Form R Releases Without Monitoring Data TRI Form R does not require stack testing. See how mass balance, emission factors and engineering calculations work, with worked examples and records to keep.
• Form A vs Form R: Toxics Release Inventory (TRI) Reporting Form A is the short alternative to Form R for TRI reporting. See the two tests, what counts toward the 500-pound limit, and when Form R is required.
• Missed the July 1 Form R (TRI) Deadline? What to Do Now Missed the July 1 Form R deadline? See how the EPCRA penalty accrues per day, how EPA's Audit Policy can reduce or waive it, and what to do first.
• Supplier Notification Under the Toxics Release Inventory (TRI) You may owe customers an annual supplier notification for TRI-listed chemicals in your products, even if you never file a Form R. See who, what and when.
• TRI Form R Applicability and Thresholds: Do You Have to File? Three tests decide whether a facility must file Form R: employee hours, NAICS code, and the reporting threshold for each listed chemical. See the full test.
• TRI Form R for Semiconductor and Electronics Manufacturing How Toxics Release Inventory (TRI) Form R reporting works for fabs and their suppliers, with Arizona's state filings and TSMC's supplier standards.
• TRI Form R Reporting for Electroplating and Metal Finishing How Toxics Release Inventory (TRI) Form R reporting works for a plating shop: listed chemicals, metal compound thresholds, releases and Arizona deadlines.

A note on how these are written

These guides provide general information and are not a determination of what your own facility must do. Regulations change, so check the current official text before you rely on any number for a decision.

Where we could not confirm something from an official source, we say so rather than fill the gap with a guess. You will see that noted in a few places, and it is deliberate.