Air Quality Walkthrough Inspection Checklist

What an air quality walkthrough inspection is

An air quality walkthrough inspection is a structured survey of a building in which you move through each zone and record the environmental conditions you find there. Rather than relying on complaint calls or instrument data alone, you walk the building and work from what you observe: how ventilation units are running, whether outdoor air intakes are clear, whether water is pooling where it should not, whether odours are present, and whether moisture or pests have taken hold. A walkthrough inspection covers the whole vertical envelope of a building. Outdoor air enters at the ground and the roof, so both are inspected. Moisture moves through roofs and attics before it shows up as stains and mould lower down, so those are inspected as well. Indoor air is then assessed in the occupied spaces — diffusers, grilles, odours, temperature, humidity, visible mould and water damage — and in the support areas such as bathrooms, chemical storage and mechanical rooms. The purpose is to identify potential air quality hazards before they affect occupants, and to initiate corrective action where something is found. This checklist supports that work. It organises 54 inspection points into nine sections — Air Quality Walkthrough Inspection, Ground Level, Roof, Attic, General Considerations, Bathrooms and General Plumbing, Maintenance Supplies, Combustion Appliances and Other — and records the person, place, date and findings for each round.

Why air quality walkthroughs matter

Indoor air quality problems rarely announce themselves. Odours, moisture and combustion gases can be intermittent, and occupants may notice fatigue or irritation long before anything visible appears. A walkthrough inspection is a way to find the conditions that produce those problems while they can still be corrected. The reason to inspect systematically rather than reactively is that most air quality issues have causes that are visible before they are measurable: - **Outdoor air entry.** Ground-level intakes blocked by obstructions, bird nests, animal droppings, or dumpsters placed too close to doors and windows reduce or contaminate the air entering the building. - **Water intrusion.** Ponding on a roof, downspouts discharging against a foundation, or sprinklers spraying exterior walls will eventually show up indoors as water damage or mould, particularly in moisture-prone areas. - **Odours and chemical sources.** Cleaning chemicals, solvents, fuel containers and unsanitised trash holding areas introduce contaminants that ventilation during occupied hours may not clear. - **Combustion gases.** Leaking, disconnected or corroded flues and soot accumulation on vent components can allow combustion gases to reach occupied space. The walkthrough also matters because it is the starting point for corrective action. Findings and deficiencies documented during the walkthrough give you a follow-up list, and the dated record lets you confirm that something was corrected before the next round.

What a good walkthrough covers

A thorough walkthrough inspection covers the full path air takes into, through and out of the building. This checklist is organised the same way, so you can work from the outside in and the bottom up: 1. **Ground level.** Ventilation units, outdoor air intakes, bird nests and animal droppings near intakes, waste container placement, external sources of air contaminants, idling vehicles, pesticide application, drainage and irrigation direction, and walk-off entry mats. 2. **Roof.** Roof membrane and structure, ponding, supply airflow direction, exhaust fan operation, intake damper position, nesting near intakes, and the direction of plumbing stack and exhaust outlet discharge. 3. **Attic.** Evidence of roof leaks, plumbing failures, and bird or rodent nesting. 4. **General considerations.** Indoor temperature and relative humidity readings and comfort ranges, diffuser and grille obstructions, odours in occupied spaces, mould and mildew, water damage on ceilings, walls and floors, pest activity and attractant sources, and occupant complaints. 5. **Bathrooms and plumbing.** Exhaust fan operation, plus a weekly trap seal routine for floor drains, infrequently used sinks and infrequently used toilets. 6. **Maintenance supplies.** Use of cleaning chemicals and solvents in well-ventilated areas, ventilation in chemical storage and trash holding areas, sealed fuel containers, and servicing of gasoline-powered equipment. 7. **Combustion appliances.** Flue and exhaust hood sizing, flue and vent connection integrity, soot accumulation, and combustion gas or fuel odours. 8. **Other.** Peeling, flaking or chipping paint on interior and exterior surfaces, and the date of the most recent radon test. Taken together, these checks cover what enters the building, what accumulates inside it, and what is exhausted. A walkthrough that skips the roof, the attic or the unoccupied support areas tends to miss exactly the conditions that cause problems later.

Standards and regulations that apply

Where a regulation or standard applies to your building, name it plainly and check its requirements directly rather than relying on the walkthrough alone. The items in this checklist record observed conditions and dates; they do not certify compliance with any particular requirement. The checklist asks you to record the date of the most recent radon test performed in the building, which supports whatever radon testing obligation applies to your premises. It asks you to inspect painted surfaces for peeling, flaking or chipping paint, noting that this may present a lead hazard in buildings constructed before 1980. Where your work falls under OSHA or a comparable occupational safety and health framework, the observations you record — combustion appliance condition, flue integrity, ventilation of chemical storage areas — feed into the obligations that framework sets. Where indoor environmental quality, HACCP or ISO management systems apply to your site, use the walkthrough as the evidence-gathering step and follow the framework's own requirements for limits, testing frequency and documentation.

How to carry out a walkthrough inspection

Work the route in a fixed order so that each round is comparable with the last. The sections of this checklist follow that order: start at ground level, move to the roof and attic, then walk the occupied interior and the support areas. At each point, record what you actually find rather than what you expect. Where the item asks for a reading or a date, record the value you observe. Where it asks you to verify a condition, confirm it directly — for example, that a supply diffuser is unobstructed, that a damper is open at its minimum position, or that a flue connection shows no corrosion. Where the item asks you to detect odours, document anything unusual, persistent or objectionable in the space where you noticed it. Take the following approach to the more detailed items: - **Airflow direction.** At the roof, confirm supply airflow inward and exhaust airflow outward. Reversed or blocked airflow is easier to spot on the roof than inside. - **Intake clearance.** Check ground-level and roof-level intakes for obstructions, nests and droppings, and confirm that dumpsters, plumbing stacks and exhaust outlets are positioned away from them. - **Water pathways.** Look for ponding, check downspout and irrigation discharge, and follow any sign of water damage back to its source. - **Trap seals.** Keep the weekly routine visible: about 1 quart of water down each floor drain, about 2 cups into infrequently used sinks, and a flush of infrequently used toilets. - **Combustion safety.** Inspect flue and vent connections for leaks, disconnections, corrosion or deterioration, check for soot inside and out, and record any combustion gas or fuel odours. Close the inspection by classifying the overall indoor air quality status of the inspected area, rating the condition of the ventilation and air distribution systems, and documenting any additional observations, deficiencies or recommended corrective actions not already captured. Signature and finish time complete the record.

Recording results and following up

The value of a walkthrough inspection depends on what you do with what you find. Record the inspection date and the real start and end dates, the person who conducted it, the location and the building zone, floor or room numbers in scope, so that a finding can be traced back to the exact area and date it was observed. Classify the overall indoor air quality status of the inspected area and rate the condition of the ventilation and air distribution systems. These two assessments give a summary that the detailed items support. Then document any additional observations, deficiencies or recommended corrective actions that the earlier items did not capture — this is where you record anything that falls between the checklist points. Review the indoor air quality concerns and complaints reported by building occupants as part of the same round. A complaint is a finding, and matching it to a physical condition observed during the walkthrough is often what turns an intermittent problem into a correctable one. Finally, keep the completed record as the baseline for the next inspection. The weekly plumbing trap seal checks and the seasonal conditions on the roof change over time, and comparing a new round against the previous one shows whether corrective action held.

Frequently Asked Questions

You walk the building zone by zone and record what you actually find rather than what you assume. The routes covered here are ground level, roof, attic, and the general occupied interior: at ground level you check ventilation units, outdoor air intakes, waste container placement, possible external contaminant sources such as chimneys, stacks and neighboring exhaust, idling vehicles, pesticide application, surface drainage and sprinkler direction, and walk-off entry mats. On the roof you check the membrane and structure, ponding, supply and exhaust airflow direction, intake dampers, plumbing stack and exhaust outlet discharge, and nesting or droppings near intakes. In the attic you look for roof and plumbing leaks and bird or rodent activity. Indoors you record temperature and relative humidity, check diffusers and grilles for obstructions, document persistent odors, inspect for mold, water damage and pest activity, and review occupant complaints. A walkthrough of this kind is a survey rather than a measurement programme, so where the checklist asks for a reading you record the value you observe and note anything you cannot verify.

This checklist starts at ground level, because most contaminated outdoor air enters a building there. Confirm that ground-level ventilation units run correctly and efficiently, that nothing obstructs outdoor air intakes, and that bird nests and animal droppings are not present near them. Verify that dumpsters and waste containers sit at an adequate distance from doors, windows and intakes. Identify nearby external sources such as chimneys, stacks, industrial plants and exhaust from neighboring buildings, and confirm that vehicles are not idling near intakes. Pesticide application should be minimized and applied according to integrated pest management guidelines. Surface drainage should be directed away from the foundation, including roof downspout discharge points, and irrigation sprinklers should direct water away from exterior walls and outdoor air intakes. Walk-off entry mats should be installed at all exterior entrances and cleaned and replaced on a regular maintenance schedule. Each of these conditions either keeps contaminants out or keeps water out; both matter for air quality.

The roof and attic checks look for water intrusion and for exhaust that finds its way back inside. Verify that the roof membrane and structural components are sound with no visible deterioration, and inspect for water ponding or pooling on roof surfaces. Confirm that roof-mounted ventilation units operate properly with supply airflow directed inward, and that roof exhaust fans expel air outward as designed. Outdoor air intake dampers should remain open and unobstructed even at minimum position. Check for bird nests and animal droppings near roof-level intakes, and confirm that emissions from plumbing stacks and roof exhaust outlets are directed away from those intakes. In the attic, inspect for evidence of roof leaks and plumbing failures and for signs of bird or rodent nesting. Attic conditions often reveal the source of an odor, a stain or a humidity problem that shows up lower in the building, so it is worth inspecting even when the occupied spaces appear normal.

Several items in this checklist address odours and contaminants at their source. Confirm that cleaning chemicals and solvents are used only in well-ventilated areas and preferably during unoccupied periods, and that ventilation in chemical storage and trash holding areas operates properly and effectively. Verify that portable fuel containers are securely sealed with caps tightened and stored in designated locations, and that gasoline-powered equipment such as snowblowers, lawn mowers and leaf blowers has been serviced and maintained to manufacturer specifications. Detect any combustion gas or fuel odours near combustion appliances and mechanical rooms. Odour is often the first sign of a problem that a walkthrough can catch before it affects occupants, so document anything unusual, persistent or objectionable in occupied spaces.

Combustion appliances are a specific focus here because a flue problem can introduce combustion gases into occupied space. Verify that furnaces, boilers and water heaters are equipped with properly sized flues or exhaust hoods. Inspect flue pipe and vent connections for leaks, disconnections, corrosion or structural deterioration, and confirm that no soot accumulation is visible on either the interior or exterior surfaces of flue and vent components. Detect any combustion gas or fuel odours in the vicinity of the appliances and mechanical rooms. Where you suspect a problem you cannot assess during the walkthrough, record it as a deficiency for follow-up rather than treating the walkthrough as the final word — the checklist records observations and findings, not measured combustion results.

Every kitchen, bathroom and laundry contains a drain or fixture that is used rarely enough for its trap to dry out, and a dry trap lets sewer gas into the building. The maintenance items here set a weekly routine: pour approximately 1 quart of water down floor drains weekly to maintain trap seals, run approximately 2 cups of water into infrequently used sinks at least once per week, and flush infrequently used toilets at least once per week to maintain proper trap seal integrity. Verify that bathrooms and restrooms have properly operating exhaust fans that effectively remove moisture and odours. Combine this with the general interior checks: confirm supply air diffusers and return and exhaust grilles are free from obstructions such as furniture, debris or stored materials, and inspect interior surfaces for visible mold and mildew, particularly in moisture-prone areas.

The checklist asks for observed conditions and readings rather than instrument results. Record the current indoor temperature and relative humidity readings, and verify that indoor temperature and relative humidity are maintained within established acceptable comfort ranges. Record the date of the most recent radon test performed in the building. Inspect interior and exterior painted surfaces for peeling, flaking or chipping paint, which may present a lead hazard in buildings constructed before 1980. If your walkthrough is part of work covered by OSHA or another regulatory framework, check what that framework requires separately from this checklist, since the walkthrough records conditions and dates rather than certifying compliance with any particular standard.

You can use this checklist on a scheduled walkthrough or in response to occupant concerns. It suits repeated rounds across a whole building because it walks a consistent route — ground level, roof, attic, general interior, bathrooms and plumbing, maintenance supplies, combustion appliances — which makes it easier to compare one inspection with the next. Record who conducted it, where and when, the building zone, floor or room numbers included, and any IAQ concerns or complaints reported by occupants. Classify the overall indoor air quality status of the inspected area, rate the condition of the ventilation and air distribution systems, and document any additional observations, deficiencies or recommended corrective actions not already captured. Signing and recording the finish time and the real start and end dates gives you a dated record to act on and to revisit.

Written by

Arne Reis

Founder

Process optimizer with 25 years of expertise, focused on operational excellence in quality, maintenance, EHS, and commissioning. Emphasizes innovative solutions and top-quality standards.

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Air Quality Walkthrough Inspection Checklist

Use this template with flowdit

How to Use This Checklist

What an air quality walkthrough inspection is

Why air quality walkthroughs matter

What a good walkthrough covers

Standards and regulations that apply

How to carry out a walkthrough inspection

Recording results and following up

Frequently Asked Questions

Still managing operations with paper and Excel?

Ready to simplify inspections and get your team moving faster?

Air Quality Walkthrough Inspection Checklist

Use this template with flowdit

How to Use This Checklist

What an air quality walkthrough inspection is

Why air quality walkthroughs matter

What a good walkthrough covers

Standards and regulations that apply

How to carry out a walkthrough inspection

Recording results and following up

Frequently Asked Questions

How do you carry out an air quality walkthrough inspection?

What should you check at ground level during an air quality walkthrough?

Why does an air quality walkthrough include the roof and attic?

How does the checklist handle odors and chemical and fuel sources?

What does the inspection cover for combustion appliances and flues?

What is involved in plumbing and moisture checks?

Does the walkthrough measure air quality directly?

Who is this air quality walkthrough checklist for, and when do you use it?

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