{"id":696,"date":"2024-02-28T11:20:57","date_gmt":"2024-02-28T17:20:57","guid":{"rendered":"https:\/\/legend-group.com\/?page_id=696"},"modified":"2024-04-03T08:47:00","modified_gmt":"2024-04-03T14:47:00","slug":"environmental-health-2","status":"publish","type":"page","link":"https:\/\/legend-group.com\/index.php\/environmental-health-2\/","title":{"rendered":"Environmental Health"},"content":{"rendered":"\t\t
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\n\t\t\t\n\t\t\t\t\t\t\t\n\t\t\t\tINDOOR ENVIRONMENTAL QUALITY\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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WHAT IS GOOD INDOOR ENVIRONMENTAL QUALITY?<\/strong><\/p>

Air quality inside a building is never exactly like what is encountered in the outdoors.\u00a0 HVAC systems supply comfort temperatures more in line with human needs and nuisance particulate like PM10 and 2.5 are filtered out from the outdoor air.\u00a0 HVAC systems are designed to provide human comfort by moving air around the building and distributing replacement outside air.\u00a0\u00a0 Finishes are chosen and installed to minimize impact to air quality.\u00a0 Relative humidity levels may or may not be optimum for human comfort but are maintained below 50% during the cooling season and at a minimum of 30% during the heating season.\u00a0\u00a0<\/p>

SO WHY DO WE HAVE AIR QUALITY COMPLAINTS?<\/strong><\/p>

Air quality that is acceptable to 95% of the occupants is considered acceptable air quality.\u00a0 What of the other 5% that perceive poor air quality in their workspace?\u00a0 Are these people just too demanding?\u00a0 Too sensitive?<\/p>

Some people have greater sensitivities to different air quality contaminants (for example molds, fine fiberglass particles, or odors).\u00a0 Their location in the building may be causing them to receive a greater burden of air contaminants than others.\u00a0 The building ventilation system may be configured creating higher contaminant loads in some locations or less outside air in other spots or insufficient heating and\/or cooling because of heat generating equipment, windows, etc.\u00a0\u00a0 A process may be going on near them that creates air contaminants.\u00a0 Bottom line is that the 5% \u201ccomplainers\u201d may have valid concerns that need investigation.<\/p>

HOW DO WE INVESTIGATE AIR QUALITY COMPLAINTS?<\/strong><\/p>

Air quality complaints are rarely investigated at outset. In the beginning, there is hope that it is a short-term problem that will resolve on its own.\u00a0 \u00a0Concerns are frequently raised to building facilities personnel for an extended period of time before outside agencies become involved in determining whether there are issues contributing to poor air quality, characterizing the poor air quality through testing, and coming up with a plan to improve air quality.<\/p>

So, what should YOU, as the building responsible party, do to prepare for an investigation?<\/p>

Have a copy of the HVAC plans. <\/u>\u00a0Most issues have their root cause in the HVAC or its operation and an understanding of the system is important in the investigation.<\/p>

Gather building occupant complaints<\/u>. Analysis of the specifics of complaints is important \u2013 particularly if complaints from early on were preserved in written form.\u00a0 An understanding of the timing is particularly relevant if periodic odor is an issue.<\/p>

Changes in building occupancy\/wall configuration, etc. <\/u>\u00a0Sometimes changes are made in the building which have not considered the operation of the HVAC system.\u00a0 Sometimes supplies and returns are separated by walls.\u00a0 Sometimes supplies or returns are eliminated.\u00a0 Sometimes contaminant generating processes are added without considering the location limitations.<\/p>

THE INVESTIGATION<\/strong><\/p>

Investigating indoor air quality is a phased process.\u00a0 The process starts out by first understanding the building systems and the occupant complaints and then developing a plan to test.\u00a0 Testing may need to be done at certain times (for example when an odor is occurring) so that we can best capture \u201cworst case\u201d for the problems.\u00a0 \u00a0Air quality complaints can occasionally be attributed to one contaminant and one process making that contaminant airborne but that is rarely the case. \u00a0More probable is a combination of events triggering air quality problems with no discernable causal contaminant.\u00a0 Many of these contaminants will be at very low levels and need to be at their highest levels to both detect and quantify.<\/p>

Investigations frequently center on identifying a contaminant(s) that is above exposure limits.\u00a0 This is not a good approach for two reasons: 1) exposure limit development has not kept up with newer chemical technology and emerging contaminants so it is difficult to assess exposure and 2) it is seldom a single contaminant or combination of contaminants causing issues with the exception of odor problems.\u00a0 Even with odor problems, many of the most odorous compounds are nitrogen and sulfur containing chemicals, react rapidly, and are difficult to collect and identify.\u00a0 In many cases, identifying a causal agent to an odor and an understanding of the components of various types of odors is a more cost-effective approach to actually identifying the components of the odor.\u00a0\u00a0<\/p>

A \u201cwholistic\u201d approach to indoor air quality investigation is more likely to produce factors that impact air quality that can be addressed without identifying a causative contaminant(s).\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\n\t\t\t\t\t\t\t\n\t\t\t\tLEGEND SERVICES\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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LEGEND has expertise in review of building mechanical systems to identify areas where indoor air quality might not be optimum and tailor the investigation to those areas as well as areas of identified as problematic through complaints.\u00a0 LEGEND has the following expertise:<\/p>