AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Variability of Size-segregated PM Mass and Submicrometer Particle Numbers during Perambulations in a Small City
JAN HOVORKA, Martina Pisova, Cecilia Leoni, Nikola Kuzelova, Charles University in Prague
Abstract Number: 468 Working Group: Aerosol Exposure
Abstract Urban air quality and appropriate personal exposure to PM are usually determined using a network of fixed-site monitors. Nevertheless, true personal exposure to PM may differ from the exposure derived from the fixed-site measurements due to variability of urban microenvironment.
Therefore, an intensive campaign of mobile measurements for PM10, PM2.5, PM1 and submicrometer particle number concentration - PNC was conducted in February 2015 in urbanised area of small city Celakovice, 30 km northeast of Prague, Czech Republic. A person carried two monitors with vertical omnidirectional inlets protruding about 20cm from the backpack. The PM data a GPS position were recorded every 10 second during the perambulation of length 3.2 km conducted at an average speed 5km/h. Totally, 38 perambulations were conducted. Large spatial and temporal variability of the PM was recorded. The highest values of PNC, up-to 40000cm-3, were recorded while crossing and walking alongside of busy streets or passing by cigarette smoker. Also, PNC exhibited large diurnal variation reflecting traffic density. Concentrations of PM1 and PM2.5, up-to 100 micrograms m-3, varied similarly to the PNC though they did not mark traffic such clearly. The highest concentration of PM10, up-to 250 micrograms m-3, reflected pavement surface and proximity to transportation while concentrations of coarse particles, up-to 40 micrograms m-3, was the best tracer of fugitive PM sources at the streets.