Clackamas County temporarily closes public access to most county buildings
Effective Wednesday, March 18, Clackamas County is temporarily closing many of its buildings to the public. The action will be in effect until at least April 30.
Coronavirus (COVID-19) Advisory: Please help us limit exposure. Learn more about COVID-19 and where to go if you have concern
Clackamas County
https://www.clackamas.us/alert
State of Oregon
Employment COVID questions: https://www.oregon.gov/employ/Pages/COVID-19.aspx
CDC stats updated noon everyday:
https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/cases-in-us.html
Coronavirus (COVID-19) Response Resources from ASHRAE and Others
ASHRAE has developed proactive guidance to help address coronavirus disease 2019 (COVID-19) concerns with respect to the operation and maintenance of heating, ventilating and air-conditioning systems. This webpage provides easily accessible resources from ASHRAE to building industry professionals.
Interim Guidance from the CDC:
Interim Guidance for Businesses and Employers to Plan and Respond to Coronavirus Disease 2019 (COVID-19), February 2020
Guidance from WHO (World Health Organization):
Coronavirus disease (COVID-19) outbreak
Most prevention is 50% Relative humidity
In the 1950s, the relationship among particle size, airborne suspension, and transmission implications began to become clear. The different routes require different control strategies, which have evolved over many years of infectious disease practice, and there are now standards of practice for infectious disease and hospital epidemiology. See the Professional Practice documents available from the Association for Professionals in Infection Control and Epidemiology at https://www.apic.org
The potential for airborne transmission of disease is widely recognized, although there remains uncertainty concerning which diseases are spread primarily via which route, whether it be airborne, short range droplets, direct or indirect contact, or multimodal (a combination of mechanisms). Ventilation and airflow are effective for controlling transmission of only certain diseases. Several ventilation and airflow strategies are effective and available for implementation in buildings. Although this PD is primarily applicable to diseases that spread from person to person, the principles also apply to infection from environmental reservoirs such as building water systems with Legionella spp. and organic matter with spores from mold (to the extent that the microorganisms spread by the airborne route).1 The first step in control of such a disease is to eliminate the source before it becomes airborne. Many diseases have been found to have higher transmission rates when susceptible individuals approach within close proximity, about 1 to 2 m (3 to 7 ft).3 Over this short range, the susceptible person has a substantially greater exposure from the infected individual to droplets of varying size, both inspirable large droplets and airborne particles (e.g., see Figure 1). Nicas and Jones (2009) have argued that close contact permits droplet spray exposure and maximizes inhalation exposure to small particles and inspirable droplets. Thus, particles/droplets of varying sizes may contribute to transmission at close proximity Ventilation represents a primary infectious disease control strategy through dilution of room air around a source and removal of infectious agents (CDC 2005). Directed supply and/or exhaust ventilation, such as nonaspirating diffusers for unidirectional low-velocity airflow, is important in several settings, including operating rooms . However, it remains unclear by how much infectious particle loads must be reduced to achieve a measurable reduction in disease transmissions and whether the efficiencies warrant the cost of using these controls. Table 1 Airborne Infectious Disease Engineering Control Strategies: Occupancy Interventions and Their Priority for Application and Research Strategy Occupancy Categories Applicable for Consideration* Application Priority Research Priority Dilution ventilation All High Medium Temperature and humidity All except 7 and 11 Medium High Personalized ventilation 1, 4, 6, 9, 10, 14 Medium High Local exhaust 1, 2, 8, 14 Medium Medium Central system filtration All High High Local air filtration 1, 4, 6, 7, 8 10 Medium High Upper-room UVGI 1, 2, 3, 5, 6, 8, 9, 14 High Highest Duct and air-handler UVGI 1, 2, 3, 4, 5, 6, 8, 9, 14 Medium Highest In-room flow regimes 1, 6, 8, 9, 10, 14 High High Differential pressurization 1, 2, 7, 8 11, 14 High High
Products:https://www.microdaq.com/extech-hygro-thermometer-humidity-detector-remote-probe.php?gclid=CjwKCAjwsMzzBRACEiwAx4lLG3QaV1p_JOrCOSupd3QcOlXomQ1ykEpGuUqq6kLPsFwf_cyZz0UyihoCs_YQAvD_BwE
Attachments area
indoor air RH prevent illness