What this is
What is an air emissions log?
What is an air emissions log?
An air emissions log is the ongoing record of monitoring at a permitted emission point: operating hours, fuel or feed, the parameter read, the result against its limit, and whether abatement equipment was running. It is completed continuously, on the schedule the permit sets, not on a periodic testing cycle.
How does an air emissions log differ from a stack test?
The log is the site's own routine reading, taken as often as the permit requires, often using in-house or continuous monitoring. A stack test is a formal, less frequent measurement campaign carried out by an accredited third-party contractor to a prescribed method, usually annually.
Who keeps the air emissions log?
The environment lead, or whoever the permit names as responsible for monitoring and recordkeeping. Permit conditions usually specify the parameter, the frequency and the method, so the log's structure is set by the permit rather than by the site.
Scope
When is an air emissions log required?
The log is for the source's own ongoing monitoring. Where the permit or a finding requires a calibrated, third-party test, the log records that a test is due but is not itself that test.
Use this template when
- A permitted source is operating and its permit schedule requires a monitoring reading
- An emission point needs its operating hours, fuel or feed and abatement status recorded for the period
- A reading has come in and needs to be checked against its permit limit and logged as within limit, marginal or exceeded
- Abatement equipment status, downtime or bypass needs to be tied to the reading it affected
- A period's readings need to be summarised for the permit compliance review or the register
Do not use it for
- Stack Test Record, the formal, accredited measurement campaign run to the permit's test schedule, not the routine reading.
- Refrigerant Leak Record, which tracks refrigerant loss from cooling and freezing systems, not stack or vent emissions.
- Greenhouse Gas Inventory, which totals emissions across scopes 1, 2 and 3 for reporting, rather than logging one point's compliance.
- Permit Condition Compliance Log, which reviews the permit as a whole rather than one emission point's readings.
- Anything outside KnowEnviro, which belongs in the workspace that owns that process.
Compliance mapping
Which Clean Air Act requirements does this satisfy?
Air emissions logging sits mostly on the permit itself rather than on a generic recordkeeping clause: the permit specifies the parameter, frequency and format, and general environmental management standards specify that the monitoring must actually happen and be evaluated.
| Clause | Requirement | Where it lands |
|---|---|---|
| Clean Air Act Title V (40 CFR Part 70) | Permit-specified monitoring, recordkeeping and reporting conditions for the emission point | Header |
| ISO 14001:2015 cl.9.1.1 | Monitoring and measurement of operations related to significant environmental aspects | Operating record |
| ISO 14001:2015 cl.8.1 | Operational control of the equipment the organisation relies on to control its aspects | Abatement equipment |
| 40 CFR 70.6(a)(3) | Prompt deviation reporting where monitoring shows a permit condition was not met | Summary |
| ISO 14001:2015 cl.9.1.2 | Evaluation of compliance with legal and other requirements, on a planned basis | Summary |
| ISO 14001:2015 cl.10.2 | Corrective action following nonconformity, including a permit breach or exceedance | Summary |
What it does not cover
- Stack Test Record, which is the calibrated, accredited measurement run to the permit's test schedule rather than a routine reading.
- Permit Condition Compliance Log, which evaluates the whole permit's conditions, not one point's readings.
- Greenhouse Gas Inventory, which is a scope 1/2/3 total for reporting, not a point-level operating record.
- The abatement equipment's own maintenance record, which belongs in the asset's PM schedule, not in the emissions log.
- Permit renewal or variation, which is a regulatory application, not a monitoring record.
Global
Air Emissions Log requirements by country
The duty to monitor and log emissions from a permitted source is set by the permit itself almost everywhere, with the surrounding management-system expectation set nationally or by ISO 14001.
Clean Air Act; Title V operating permits (40 CFR Part 70)
Permit conditions specify the parameter, frequency, method and deviation reporting timeline for each emission point.
A source operating outside its permit's monitoring conditions is in breach independent of whether a limit was exceeded.
Provincial environmental permits (e.g. Environmental Compliance Approvals, industrial approvals)
Permit-by-permit conditions set the monitoring schedule and reporting format, issued and enforced provincially rather than federally.
The log's structure should follow the specific provincial permit rather than a generic template, since conditions vary by province and source type.
ISO 14001:2015
Monitoring and measurement of significant aspects, and evaluation of compliance, required as ongoing management-system activities.
Certification audits examine whether monitoring data is actually evaluated against obligations, not only whether it is collected.
How to complete it
How to complete an air emissions log, step by step
Most air emissions logs are completed to the letter of the permit's monitoring schedule. The parts that make the log defensible are the ones the permit does not spell out.
Whether the scrubber or bag filter was running, on schedule and performing needs entering against the same reading it affects, at the time. Reconstructing it afterwards from a maintenance log produces a status that may be true in general but was not necessarily true for that reading.
A reading close to the limit will exceed under slightly different conditions: a colder day, a different feed, a partly loaded abatement system. Logging it as within limit because it technically was, without flagging the margin, loses the early warning it was giving.
The log's continuous readings and the stack test's calibrated campaign answer different questions on different schedules. Referencing the stack test record from the log period it covers keeps the two consistent without collapsing them together.
Where a permit condition was not met, the reporting deadline is usually short. An exceedance logged correctly but not escalated to a regulator notification within its own condition creates a second breach on top of the first.
What auditors find
Most common air emissions log findings
Air emissions log findings are rarely about a missing reading. They concern what surrounds the reading: the abatement status, the escalation, and whether a marginal result was treated as one.
| Finding | Clause | What fixes it |
|---|---|---|
| Reading logged without the abatement equipment's operating status for that reading. | ISO 14001:2015 cl.8.1 | Require abatement status against every reading, not as a separate periodic check. |
| Source operated without abatement running, with no exceedance flagged because the reading was within limit. | Clean Air Act Title V (40 CFR Part 70) | Log operating-without-abatement as a finding in its own right, independent of the reading. |
| Marginal results logged as compliant with no flag or trend review. | ISO 14001:2015 cl.9.1.1 | Set a marginal threshold below the limit that triggers a flag and a trend check. |
| Deviation not reported to the regulator within the permit's own timeline. | 40 CFR 70.6(a)(3) | Tie the notification deadline to the exceedance date, not to log review. |
| Permit condition breach not linked to the permit register or the compliance log. | ISO 14001:2015 cl.9.1.2 | Populate the permit register ID and compliance log ID at the point the breach is recorded. |
| Corrective action raised with no owner, date or verification of effectiveness. | ISO 14001:2015 cl.10.2 | Assign the CAPA when the action is marked required, and verify effectiveness rather than closure. |
Case in point
Case in point: the reading that was within limit and still wrong
A rendering plant's extraction stack was logged monthly against its odour and particulate limits. For four consecutive months the readings sat comfortably within limit. The abatement equipment field was completed as 'operating' each month, taken from the fact that the biofilter was switched on.
An odour complaint investigation found the biofilter's media had been due for replacement for two of those four months, running at a fraction of rated capacity. Readings had still passed because the process ran below its permitted load that period; at full load the same media would not have held the limit. The log recorded that abatement was on, which was true, without recording that it was failing, which was the fact that mattered.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
4 sections
- Reference
- ENV-022
- Archetype
- Log
- Record ID
- AEL-2026-000
- Scoring
- Within permit limits
- Direction
- High is good
- Singleton
- No
- Basis
- Clean Air Act, provincial permits
- Links
- Links Asset, Permit
- Tags
- Environment, Air
- Sections
- 4
- Fields
- 43
- Follow up fields
- 6
- Repeating sections
- 1
- Links out
- 4
Header
11 fieldsLog ID*
Auto sequence. Format AEL-2026-000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Date and Time*
Completed By*
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
Area
The area within the site.
Exact Location
Drop a pin for anything hard to find.
Emission Point Reference*
Source*
Boiler, generator, rendering plant, dryer, extraction stack or process vent.
Permit Condition Applies*
Operating record
Repeats11 fieldsDate*
Operating Hours
Fuel Or Feed Type
Parameter Monitored*
Reading*
Limit
Within Limit*
- Yes3 pts
- Marginal1 pt
- No0 pts
Abatement Operating*
- Yes3 pts
- Partly1 pt
- No0 pts
Visible Emission*
- None3 pts
- Slight1 pt
- Significant0 pts
Exceedance Detail
Action Taken
Abatement equipment
6 fieldsAbatement Type
Scrubber, biofilter, cyclone, bag filter, thermal oxidiser or none.
Abatement On PM Schedule*
- Yes3 pts
- No0 pts
Performance Indicators Monitored*
- Yes3 pts
- Partly1 pt
- No0 pts
Abatement Downtime Hours
Operated Without Abatement*
Running the process while abatement is down is usually an explicit permit breach.
- No3 pts
- Yes0 pts
Regulator Notified If Required
- Yes3 pts
- Not required3 pts
- No0 pts
Summary
15 fieldsReadings Taken*
Readings Due*
Monitoring Compliance Percent*
Exceedances This Period*
Trend Direction*
- Improving3 pts
- Stable2 pts
- Worsening0 pts
Permit Condition Affected*
Discharge consent, emissions permit, waste licence or abstraction licence.
- No3 pts
- Yes0 pts
Permit Register ID
Links to ENV-039 Register ID
Breach Of Permit Condition*
- No3 pts
- Yes0 pts
Compliance Log ID
Links to ENV-040 Log ID
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Environmental Lead*
Signature*
ENV-022 · record IDs look like AEL-2026-000 · Links Asset, Permit
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The log itself is straightforward to complete. What slips is the abatement status nobody cross-checked, the marginal reading nobody flagged, and the deviation that missed its own reporting deadline.
Holds the emissions log against the permit register and the emission point it belongs to, and flags where a reading has gone unrecorded against its scheduled frequency.
Ties abatement equipment status and downtime to its own maintenance schedule, so a reading logged as 'abatement operating' can be checked against whether it actually was.
Connects the monitoring method to the competency of whoever takes the reading, so a continuous monitor or manual read is operated by someone trained on it.
Watches for a marginal result, an operating-without-abatement entry or an unreported deviation, and raises it against the permit's own reporting clock rather than the periodic review.
This template lives in KnowEnviro — environment and energy. Aspects, permits, waste, emissions, spills and sustainability reporting.
Meet KnowEnviro→Glossary
Air Emissions Log definitions and key terms
- Abatement equipment
- Plant fitted to control emissions before release, such as a scrubber, biofilter, cyclone, bag filter or thermal oxidiser.
- Emission point
- The specific stack, vent or discharge point a permit condition applies to, distinct from the process or building it serves.
- Deviation
- An instance where a permit condition, monitoring or operating, was not met, whether or not a numeric limit was exceeded.
- Opacity
- A measure of how much a plume obscures light behind it, used as a proxy for particulates where continuous monitoring is not fitted.
- Permit condition applies
- A flag confirming an entry falls under an enforceable permit condition, as opposed to voluntary or informational monitoring.
FAQ
Frequently asked questions about air emissions log
What is the difference between an air emissions log and a stack test record?+
The log is the site's own routine reading, taken to the frequency the permit sets. A stack test is a formal, accredited campaign by a third-party contractor to a prescribed method, usually annual, and is recorded separately.
Does operating without abatement equipment always breach the permit?+
In most permits, yes, independent of the reading. Many conditions require abatement running whenever the process runs, so a period without it is a deviation even if the emission stayed under limit.
How is a marginal reading different from an exceedance?+
An exceedance has crossed the limit; a marginal reading has not, but sits close enough that a small change would cross it. Flagging it, rather than a simple pass, gives the log an early warning function.
How quickly does an exceedance need to be reported?+
Permit conditions typically set a short window, often days, for reporting a deviation once identified. The clock runs from the exceedance, not from log review, so delay can itself create a second breach.
Who keeps the air emissions log?+
The environment lead, or whoever the permit names as responsible for monitoring, usually working from readings taken by operations or automated equipment.
Does a compliant log mean the permit is being met?+
Only for what the log covers. A permit carries other conditions beyond emission limits, including abatement operation and reporting deadlines, and the permit condition compliance log evaluates the permit as a whole.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Environmental Management
Legal and Other Requirements Register
Lists every law, regulation, permit and commitment that applies to your operation
Compliance Evaluation Record
Records the periodic evaluation of whether you actually comply with each obligation
Waste Stream Register
Lists every waste stream produced on site, with its classification, container and disposal route
Waste Transfer Record
Records waste leaving site, including type, quantity, carrier and destination
Hazardous Waste Record
Records generation, storage and disposal of hazardous waste
Waste Area Inspection
Checks waste storage areas for correct segregation, labelling, containment and housekeeping
More in Emissions
Stack Test Record
Records measured emissions from a stack against permit limits
Refrigerant Leak Record
Records refrigerant loss from cooling and freezing systems
Greenhouse Gas Inventory
Records emissions across scope 1, 2 and where available scope 3
Emissions Permit Compliance Review
Checks that every condition of an air permit is being met
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- Clean Air Act; Title V operating permits, 40 CFR Part 70
- 40 CFR 70.6(a)(3), permit deviation reporting condition
- ISO 14001:2015, clauses 8.1, 9.1.1, 9.1.2 and 10.2
- Provincial environmental permit / approval conditions (Canada)
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.