"Wisdom begins in wonder" – Socrates
Month: January 2026
Plume Rise
01/22/26
“How far does air pollution rise after release from a stack?”
People often release waste air from a building stack. This air will rise to a certain height called the Plume Rise before moving in the direction of the wind. The higher the plume rises, the lower the amount of pollution that will fall on the ground. A higher exit temperature and faster exhaust speed lead to a larger sack height.
Acceptable Daily Intake (ADI)
01/21/2026
“How does the WHO measure how much a certain substance in food or drinking water can be consumed daily over a lifetime without an appreciable health risk?”
NOAELs document how much of a substance an organism can handle before a statistically significant health effect occurs. However, these studies may be conducted in controlled environments or on test animals that may not accurately reflect human conditions. To account for all of these variables, organizations such as the World Health Organization (WHO) and the European Food Safety Authority (EFSA) use Acceptable Daily Intake (ADI). Acceptable daily intake measures the amount of a certain substance in food or drinking water that can be consumed daily over a lifetime without an appreciable health risk to people. This is commonly expressed as milligrams of substance per kilogram of body weight and is applied by regulatory and health authorities all over the world to monitor food additives, pesticides, and much more. Acceptable daily intake is applied to food ingredients similar to how reference dose is applied to environmental toxins.
Reference Dose (RfD)
01/20/26
“How does the U.S. EPA produce recommended daily lifetime exposure limits for substances?”
NOAELs are the highest level of a substance a person can take without any statistically significant effects, according to research. However, this could be much higher than what may actually be safe for long-term use. The U.S. EPA has created the Reference Dose (RfD) in response. Reference does are the maximum acceptable oral dose of a toxic substance that has no adverse noncancer health effects from a lifetime of exposure. Reference doses are commonly found by dividing the NOAEL for a substance by uncertainty factors.
NOAEL – No Observed Adverse Effect Level
01/19/26
“How can we measure the highest dose of a substance that does not cause any statistically significant effect?”
People worry about whether a substance they’re exposed to leads to health complications. One way to understand this is to measure the highest dosage of the substance that organisms can handle before a statistically significant effect occurs. Labeled NOAEL – No Observed Adverse Effect Level, these measurements are fundamental for quantifying safe exposure levels for substances.
Wet Scrubbers (Air Pollution)
01/18/26
“How can we use water to remove harmful particles and gases from industrial air pollution?”
Industrial air pollution often contains toxic gases and harmful particulate matter at the same. Air pollution remediation systems typically concentrate on removing only one of these factors. Wet Scrubbers can handle both. Wet scrubbers first spray water or water-based solution droplets over the exhaust air. These droplets catch particulate matter and absorb toxic gases. Wet scrubbers usually use packing beds to maximize contact between the liquid and the exhaust air. The exhaust air will rise, cleansed of pollutants, and go through a mist eliminator to remove any remaining water droplets. People can recycle the dirtied liquid produced by these operations or treat it as wastewater. Wet scrubbers are a highly effective technology for treating industrial air pollution.
Image credit: https://tecamgroup.com/
Air-to-Cloth Ratios for Baghouse Filters
01/17/26
“How can we determine how to design a bag filter using one value?”
Baghouse filters are one of the most widely used industrial air pollution control technologies in the world. Their ability to stick particulate matter emissions onto bagged filters leads to their high efficiency. But how exactly do we design these machines? Well, what if we take the ratio of the volume of air moving through the cloth filters every minute vs the interior surface area of the cloth filters themselves? This value, termed the Air-to-Cloth Ratios for Baghouse Filters, determines how many volumes of air each square meter of the filters must handle. The higher the air-to-cloth ratio, the faster particles will move through the system, which increases the frequency of particulate matter clogging the filters and forcing more filter cleaning to occur.
Image credit: https://cdn-ileaghk.nitrocdn.com/
Trailer-Mounted Generators
01/16/26
“How can we move generators with trailers?”
Large generators are a necessity for portable and emergency large-scale power. However, transporting these behemoths is a difficult task. One way people have accomplished this is through Trailer-Mounted Generators. Trailer-mounted generators are easily attached to a trailer for transport. Trailer-mounted generators are useful for construction sites, emergency response, remote-location infrastructure, and outdoor events.
Mean High Water Mark
01/15/26
“What’s the legal and scientific boundary for a water body?”
Water bodies will expand and contract over land, whether it’s a small river or a massive tidal bay. The point delineating the high tide mark from the land has massive geological and ecological implications, given the difference in water saturation. The Mean High Water Mark is the average high tide mark over a long period of time. The mean high water mark often delineates the legal and scientific boundary for a water body, making it very important to quantify.
Wall Collection Devices (Air Pollution)
01/14/26
“How can we remove particulate matter by sticking it on a wall?”
Particulate matter emissions are harmful to nearby communities. Consequently, people use technology to remove as much particulate matter as possible before emitting. One set of technologies sticks particulate matter on walls to form conglomerations, which can be removed later. TheseWall Collection Devices can work by forcing particles to drop from gravity, hit a wall due to sudden direction changes, or move due to electrostatic attraction. These wall collection devices help the health of countless towns around the world.
Image credit: https://www.graco.com/
Isaac's Science Blog 