The EPA announced the designation of five new equivalent methods for measuring pollutant concentrations in the ambient air: One for measuring concentrations of PM10-2.5, one for measuring concentrations of PM10, two for measuring concentrations of PM2.5 and one for measuring concentrations of NO2.
What is the latest AERMOD model? What measurements need to be made for use with this model? How long do you need to measure this data?
Thank you for you inquiry. The EPA released the latest version of AERMOD in December 2012 and is labeled as Version 12345.
The primary meteorological variables required for dispersion modeling include wind direction, wind speed, temperature, change in the vertical profile of temperature (delta-T), humidity, pressure, and radiation. The standard exposure height of wind instruments in open terrain is 10 meters. Depending on your project, your regulating authority may require more variables be collected and measurements be made at the height of the stacks (up to 100 meters). The EPA requires one year of onsite data be collected for dispersion modeling purposes. Again, depending on your project, some state regulators may require more than one year of meteorological data be collected on site.
Please feel free to call me any time, I would be happy to discuss your project and answer any of your questions.
For ease of use, and most importantly manufacturer support, I recommend Teledyne-API NOx analyzers. Thermo-Fisher are great too. For PM2.5 – Met One BAM.
Power requirements vary slightly from unit to unit, but they are very low – around 2.5 amps at 100Vac. Please feel free to call me any time to discuss your specific requirements, there are a myraid of options to condider and I’m quite happy to explore them all with you!
What analyzer do you recommend for NOX and PM2.5 monitoring? What type of power needs do these analyzers have? How often do they need to be serviced? How big are they – what type of space is required? What other equipment is typically needed (computers or radios..)?