Diagram comparing the sizes of common airborne particles including human hair (50–70 microns), pollen (30–50 microns), ragweed (17–23 microns), dust mite (10 microns), and a 1-micron reference marker. The illustration uses scaled circles to visually represent relative particle sizes, relevant to air quality and filtration contexts.
Mr. Wachtel is a member of the SeaTac City Council and chairs their Aviation Advisory Committee. The following letter was e-mailed to key Councilmembers in Des Moines, SeaTac, Normandy Park, Tukwila and Federal Way. Hi Joel, As I mentioned at yesterday’s Highline Forum, HB2315 is moving ahead very fast. There have been two hearings so
$1,000 can raise a class’s test scores by as much as cutting class size by a third. By Matthew Yglesias@mattyglesiasmatt@vox.com An emergency situation that turned out to be mostly a false alarm led a lot of schools in Los Angeles to install air filters, and something strange happened: Test scores went up. By a
2018-02-07
A study of residences near Boston's Logan International Airport found that jet engine exhaust significantly raises ultrafine particle concentrations both outdoors and indoors, with levels roughly 1.7 times higher when winds blow from the airport's direction. Researchers monitored 16 homes located 4–6 km from the airport and confirmed that aviation-related particles penetrate inside residences, posing potential health risks to nearby communities. While focused on Logan Airport, the authors note these findings are likely applicable to other major airports, including those in dense urban areas.
2015-08-01
This Washington State Department of Health guide provides recommendations for schools and buildings on how to maintain healthy indoor air quality during wildfire smoke events. It advises closing windows and air intakes when outdoor air quality is hazardous, upgrading HVAC filters, and using portable HEPA air cleaners to reduce fine particles and gases from smoke. Building managers are also encouraged to monitor carbon dioxide and carbon monoxide levels indoors and take steps to flush out buildings during periods of improved outdoor air quality.
2014-09-03
Department of Civil, Architectural and Environmental Engineering, Illinois Institute of Technology, Chicago, IL, USA Received 31 July 2014, Revised 26 August 2014, Accepted 3 September 2014, Available online 4 September 2014. Abstract This work uses 194 outdoor particle size distributions (PSDs) from the literature to estimate single-pass heating, ventilating, and air-conditioning (HVAC) filter removal efficiencies
2018-02-07
2015-08-01
2014-09-03