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Wendell Rahorst, Inc.

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Indoor Air Quality


Inhalation is considered the primary pathway for airborne agents to enter our bodies. Our lungs are the mechanism by which our bodies transport the oxygen necessary for life into our bodies and for expelling the waste Carbon Dioxide that is part of the respiration process.


Other airborne agents are also transported by this process. Examples of these agents are gases such as Carbon Monoxide, vapors such as water, and particles such as metal dusts, silica, pollen, fungal and bacterial spores, and many other solids and semi-solids.


All of these agents can affect the air quality of both indoor and outdoor environments. Indoor air, due to the smaller dilution factor, can experiences wide changes of concentrations of these agents if the source of the agent is indoors. With the current technologies we have today we quite often generate indoor sources of potentially hazard concentrations of many agents. Industrial environments are particularly susceptible to these issues due to manufacturing process and accidents. But related office and residential locations quite often feel the effects from either current or past industrial pollution.

Wendell Rahorst, Inc. has the resources and abilities to perform exposure assessments for most agents of concern.


Air Quality Information Sites




The U.S. EPA, NOAA, NPS, tribal, state, and local agencies developed the AIRNow Web site to provide the public with easy access to national air quality information. The Web site offers daily AQI forecasts as well as real-time AQI conditions for over 300 cities across the US, and provides links to more detailed State and local air quality Web sites.


National Jewish - Pollen Count


The following Denver Pollen Count is gathered by National Jewish Health® and is updated most weekday afternoons during allergy season.


National Allergy Forecast


Commerical site that provides nationwide allergy forecast.


American Academy of Allergy, Asthma & Immunology (AAAAI) National Allergy Bureau™ (NAB™)


Professional association site with that provides nationwide pollen and mold levels.

Indoor Air Quality Services provided by Wendell Rahorst, Inc.


Documentation of complaints and symptoms

·         Interviews with management and occupants

·         Identification and control of human    pathogens

·         Administer standardized questionnaire in “Complaint” and “Control” areas

·         Analyze questionnaire data and compare to extensive data base


Ventilation system assessment

·         HVAC design analysis

·         Air flow and distribution analysis

·         Code compliance surveys


Source Assessment

·         Multiple chemical sensitivity

·         Chemical inventory

·         Chemical processes and pollution-generating equipment

·         Smoking policies and locations

·         Combustion processes

·         Furnishing, insulation materials

·         Microbial growth - Mold, Fungal Agents, Bacterial Agents

Indoor air contaminant measurement


·         Temperature, and Carbon Dioxide control

·         Characterizations and contro·         Building component off-gassing

·         Volatile organics, formaldehyde, solvents, hydrocarbons, etc.

·         Particulate matter – dust, soot, smoke, asbestos, fiberglass

·         Radon

·         Biological particulates – fungal spores, bacteria, allergens

·         Environmental factors – temperature, relative humidity, noise, lighting

·         Recommendations for corrective actions