Indoor Air Quality Assessments

Lead-based Paint (LBP) Inspections

Lead was historically used in paints and coatings. These lead-containing paints were commercially available to consumers and contractors alike. Structures built prior to 1978 are more likely to contain lead in paints and coatings than more recently built structures. Lead is a concern in housing because it is a poison that is easily ingested in the form of paint chips, soil, and dust, principally by children under the age of 6, though lead in housing is also a hazard for adults at higher levels.

According to the EPA, lead-based paint is defined as any paint, varnish, stain, or other applied coating that has 1 mg/cm2 (or 5,000 ppm (0.5%) by weight) or more of lead. Prior to 1978, lead-base paint was used prevalently in homes and businesses.

Lead is a highly toxic metal that affects every system of the body. While adults can suffer from excessive lead exposures, fetuses, infants and children under age 6 are more at risk.

If the paint is peeling, chipping, chalking, or cracking, or you need a HUD inspection, contact DRH Environmental today for an inspection and sampling to determine if LBP is present.

Federal HUD has mandated abatement of lead hazards in federal housing. Federal EPA regulations require disclosure of lead hazards by all home sellers, leasers, and renters of pre-1978 housing. 


  • Call us today for a LBP inspector to test your home or business.

  • DRH is certified for lead inspections and can assist you with getting information you need for a renovation, demolition, due diligence or a HUD inspection

  • DRH collects paint chip samples and uses an XRF.

  • DRH is certified and conducts HUD inspections according to EPA and HUD regulations.

Call for pricing!

Asbestos Containing Materials (ACM) Inspections

Are you looking to renovate or modify an older house or business and think there may be asbestos containing materials (ACM)? Did you know that homes built after the 1990's also have asbestos containing materials in them. Due to excessive hurricanes destroying many homes in the south, drywall and other building materials were imported from other countries and installed without being checked for asbestos.


The Health Hazards Control Unit (HHCU) of the N.C. Department of Health & Human Services, Division of Public Health, must be notified of plans to demolish a building, including residences demolished for commercial or industrial expansion. Owners or operators must obtain an asbestos removal permit from the HHCU prior to any renovation project that will disturb more than 35 cubic feet, 160 square feet, or 260 linear feet of regulated asbestos-containing material

Asbestos is a naturally occurring, fibrous silicate minerals mined throughout the world for its unique properties, such as; thermal insulation, chemical and thermal stability, and high tensile strength. Asbestos is commonly used as an acoustic insulator, thermal insulation, fire proofing and in other building materials. In addition to being mined, asbestos can be found naturally in the air outdoors and in some drinkable water.

Common areas in the home where asbestos can be found include:

  • Steam pipe wraps, boilers and wraps, furnace ducts

  • Resilient floor tiles, vinyl flooring and mastic (glue)

  • Ceramic tile, and grout

  • Vinyl base cove and glue

  • Carpet glue

  • Cement Sheet, millboard,

  • Door gaskets, caulk

  • Soundproofing or decorative material, and popcorn textured ceilings

  • Wallboard, patching and joint compound

  • Cement roofing, shingles, tar, caulk, and siding

  • Insulation

Asbestos exposure is a health concern when high concentrations of asbestos fibers are inhaled over a long period of time.  If asbestos material is disturbed it may release asbestos fibers, which can be inhaled into the lungs. After inhaled, asbestos fibers can remain and accumulate in the lungs, which over time may cause serious lung diseases including: asbestos, lung cancer, or mesothelioma. Remodeling or demolition activities including cutting, sanding, or disassembling can disturb asbestos fibers and release the fibers into the air. In addition, it may convert to a building material that is crumbly and easily ground up with your hand.

Call Today and DRH will be able to do the following:

  • Assist you with getting the information you need to submit to the HHCU for a renovation or demolition project

  • Conduct a limited assessment as part of a Phase I ESA or due diligence assessment.

  • Visual inspect and collect samples according to EPA, NESHAP, and AHERA regulations.

  • DRH Environmental Services is certified for asbestos inspections.

Call today for pricing!

​​​​Mold Assessments
Common biological dust components such as mold and pollen are not regulated by any State or Federal agency, and as such have no mandated permissible exposure limits (PEL) or threshold limit values by which to unilaterally determine the habitability of any indoor environment. Further, all individuals react differently to exposure to indoor molds, which makes establishing such limits applicable to all individuals virtually impossible. When assessing the indoor air quality of an environment, one must take into consideration the occupants or proposed occupants and their individual sensitivity with respect to indoor environmental contaminants.

The air quality inside your home or office directly contributes to the health and well-being of everyone who lives and works there. Mold is one of many contaminants that, if present, can pose serious risks to allergy and asthma sufferers and otherwise healthy individuals and pets as well. If requested, DRH would collect real time readings for carbon monoxide and carbon dioxide.

However, in the absence of State and Federal exposure limits for mold in indoor environments, several current industry guidelines exist that we believe accurately address the air quality of an indoor environment. During all mold assessments, We follow the guidelines and recommendations provided by the California Department of Health Services (DHS), the Environmental Protection Agency (EPA), and the New York Guidelines for Assessment of Fungi in Indoor Environments.

  • The Inspector will conduct a "top to bottom" inspection for visual mold growth, visual water intrusion areas, and inspect the HVAC system for mold growth or temperature differential. 

  • DRH does a complete mold inspection with samples collected and submitted to a certified laboratory for analysis.

  • DRH is specialty trained to interpret lab reports

  • DRH will provide a complete report including the site visual inspection, discussion of the laboratory results, and recommendations.

Great pricing on Mold Inspections!

Indoor Air Quality Parameters

Temperatureperceptions (too hot, too cold, drafts, etc.) are the number one source of building occupant air quality complaints. Relative humidity (RH) levels are often overlooked but are a significant factor in maintaining employee health, reducing absenteeism and increasing productivity in commercial buildings. Consensus thermal comfort guidelines have been developed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) in conjunction with the American National Standards Institute (ANSI) and are published in the ANSI/ASHRAE Standard 55-1992, “Thermal Environmental Conditions for Human Occupancy.” ANSI/ASHRAE recommends that indoor RH levels not exceed 60% (as prolonged humidity levels above 60% may cause molds, spores and fungi to propagate), and defines the summertime Operative Temperature range as between 73°F and 79°F. ANSI/ASHRAE recommends that the wintertime indoor temperature be maintained between 68°F and 75°F with a minimum RH level of 30% (as humidity levels below this range may cause drying of the nose, eyes and throat and may also cause dry, itchy skin).

Carbon dioxide (CO2)at very high concentrations (e.g. greater than 5000 ppm) can pose a health risk, according to ASHRAE Standard 62.1-2010, "Ventilation for Acceptable Indoor Air Quality". However, in most buildings, concentrations almost never rise to these levels. CO2 at the concentrations commonly found in buildings is not a direct health risk, but CO2 concentrations can be used as an indicator air quality. An indicator of inadequate fresh air or insufficient dilution of air contaminants. carbon dioxide in excessive amounts is an asphyxiant.

Carbon monoxide (CO)usually originates from outside the building from such sources as automotive traffic and loading docks. Internal sources include cigarette smoke, boilers and furnaces. Assuming internal sources are limited, monitoring for carbon monoxide is a useful surrogate for determining if outside air intakes are being impacted by automotive traffic. The EPA National Ambient Air Quality Standard (NAAQS) for carbon monoxide is generally accepted as indoor air quality criteria. Carbon Monoxide displaces oxygen and individuals can  mistake symptoms for the common cold or flu. As exposure continues, individuals will experience, dizziness, nausea, rapid breathing, or faint and mental confusion. Sources may include poorly vented gas fired water heaters, poorly sealed wood burning stoves, insufficient replacement air around gas or wood fireplaces, space heaters, and vehicle exhaust from garage into buildings.

Volatile Organic Compounds (VOCs)include a wide variety of organic compounds, which may exist in the vapor phase at room temperature or bound to airborne particles.  There are various potential origins such as perfumes, cleaning solutions, infiltration from outdoor air, heating ventilation and air conditioning (HVAC) systems, bacterial and fungal activities and product emissions.  Products with the highest amounts of VOC emissions include: paints, fabrics and treatments, foam or stuffed cushions, plastics, adhesives, cleaning solvents, carpets and floorings. Other building material with high levels of VOC emissions are furniture spray polishes, wood stains, plywood, particle board, fiberboard, and hardwoods.

Formaldehyde is a colorless, flammable gas at room temperature and has a strong odor.  Exposure to formaldehyde may cause adverse health effects such as irritation to the eyes, nose and throat, coughing, eczema, sleeping difficulties, anxiety, fatigue, possibly thirstiness, diarrhea, and memory loss. More severe exposure can lead to asthma attacks, nausea, vomiting, headaches, nose bleeds. 

     Formaldehyde is found in resins used in the manufacture of composite wood products (i.e., hardwood plywood, particleboard and medium-density fiberboard); cabinetry and paneling, building materials and insulation; laminates, household products such as glues, permanent press fabrics, paints and coatings, lacquers and finishes,carpets and carpet backings, paper products, plastics, preservatives used in some medicines, cosmetics and other consumer products such as dish washing liquids and fabric softeners; and fertilizers and pesticides.  It is also a byproduct of combustion and certain other natural processes, and found in emissions from unvented, fuel burning appliances, like gas stoves or kerosene space heaters, and cigarette smoke.

Allergens can consist of many small particles of building materials which include fiberglass, fibers from textiles, minerals, wood; plant parts, animal parts dander, skin cells, animal or human hairs, silicates,ash, metal fumes, pharmacuticals, and soil.  Allergens or dust particulates can cause allergy like symptoms, lung irritations or even long ternm health effects (e.g. asbestos dust).

Radon in air is ubiquitous." Radon is found in outdoor air and in the indoor air of buildings of all kinds. EPA recommends homes be fixed if the radon level is 4 pCi/L (picocuries per liter) or more.EPA estimates that about 21,000 lung cancer deaths each year in the U.S. are radon-related. Exposure to radon is the second leading cause of lung cancer after smoking. Radon is an odorless, tasteless and invisible gas produced by the decay of naturally occurring uranium in soil and water. Radon is a form of ionizing radiation and a proven carcinogen. Lung cancer is the only known effect on human health from exposure to radon in air. Do not presume that because the action level is 4 pCi/L, a radon level of less than 4 pCi/L is "safe". This perception is altogether too common in the residential real estate market. In managing any risk, we should be concerned with the greatest risk. The greatest exposure to radon is in our homes; especially in rooms that are below grade (e.g., basements), rooms that are in contact with the ground and those rooms immediately above them" (

Sick Building Syndrome

     The National Institute for Occupational Safety and Health ( prefers the term "Indoor Air Quality." If 20% of the work force has symptoms -- including watering eyes; hoarseness; headaches; dry, itchy skin; dizziness; nausea; heart palpitations; miscarriages; shortness of breath; nosebleeds; chronic fatigue; mental fogginess; tremors; swelling of legs or ankles; and cancer -- the building may be labeled a "sick building." The telling factor is if the symptoms ease when workers are at home or on vacation.
     The causes are many. In the 1970s, there was a movement amongst builders and regulatory authorities to button-up buildings to save on fuels for heating and air conditioning. Many buildings became virtually air-tight. According to the American Society of Heating, Refrigerating and Air-Conditioning Engineers, some polluting factors include indoor combustion (heaters, ranges, smoking) and buildup of carbon monoxide and inhalable particles; volatile organic compounds such as benzene, styrene, and other solvents; and airborne-allergens and pathogens, such as viruses, bacteria, fungi, spores, and protozoans. Added to that are new building materials (plywood, carpet glue) and fabrics (rugs, furniture) that "offgas" toxic fumes.

     The EPA highlights the distinction between sick building syndrome and building related illness. The latter term is used for situations in which signs and symptoms of diagnosable illness are readily identified and can be attributed directly to specific airborne building contaminants. Examples of building related illnesses are Legionnaires' Disease and hypersensitivity pneumonitis. In contrast, the cause(s) of symptoms in cases of sick building syndrome are often hard to pin down and in many cases a range of factors may contribute to the situation. When a sick building is identified an extensive investigation by people such as the employer, building owner or manager, building investigation specialist, and if necessary, local medical authority epidemiologists and other public health officials, is often required.
     Once a sick building has been investigated various measures must be taken to ensure the cause(s) are removed to make it safe for the occupants.Although the problem of sick building syndrome has been recognized for decades, statistics regarding the prevalence of the problem are limited. A World Health Organization (WHO) report from 1984 suggested that up to 30% of new and renovated buildings worldwide may generate excessive complaints related to indoor air quality (1). This high rate may be associated with modern mass produced construction materials that tend to offgas irritating volatile organic chemicals (VOCs). In a US report, of office workers questioned at random, 24% reported air quality problems in their work place, and 20% believed this harmed their ability to do their job effectively. If you believe you want to have an assessment done for sick building syndrome, please contact  DRH Environmental Services LLC @