The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Spatially resolved measurements of trace gas abundances by satellite have revolutionised the field of large-scale tropospheric chemistry observation and modelling during recent years. Now a similar revolution is imminent on local and regional scales. A key role in these advances is played by spatially resolving spectroscopic techniques like active and passive – DOAS tomographic measurements of two-dimensional...
More than three decades have passed since the launch of the first satellite instrument used for atmospheric aerosol detection. Since then, various powerful satellite remote sensing technologies have been developed for monitoring atmospheric aerosols. The application of these new technologies to different satellite data have led to the generation of multiple aerosol products, such as aerosol spatial...
United States Environmental Protection Agency (USEPA) developed opacity standards for sources of visible emissions to protect the visual quality of ambient air. Method 9 is USEPA’s standard method to quantify plume opacity by visual observations from qualified human observers during daytime. These observers are required to be certified twice a year at a “smoke school”. “Smoke school” is more formally...
The use of passive Fourier Transformation Infrared Spectrometry (FT/IR) is a way for the fast recognition and identification of airborne pollutants. In studies done by the Department of Safety Engineering/Environmental Protection at the University of Wuppertal a passive FT/IR was used to show the possibilities of such a system. The fast identification of accidentally released substances is a very...
Atmospheric trace gases can be measured by remote sensing of scattered sunlight from space, using its unique absorption features in the ultraviolet region. The satellite remote sensing approach associated with the spectral fit technique has been successfully employed for measurements of tropospheric trace gases on global and regional scales. Here we present the retrievals of tropospheric traces gases...
A new test method for measuring fugitive dust emissions has been developed. This method includes one open path laser transmissometer (OPLT) extended to a path of several undred meters to measure ground-level extinction coefficients across an entire plume combined with one tower with at least two vertically distributed and time-resolved dust monitors (DM) (in the middle of the OP-LT path) to measure...
This chapter presents information on test aerosols, generation methods, and analysis techniques that are used in the Aerosol Sciences Laboratories, US Army Edgewood Chemical Biological Center (ECBC) to quantitatively characterize the performance of aerosol samplers. The Sampling Efficiency results of three aerosol samplers characterized at ECBC are also presented in this chapter solely for the purpose...
Photochemical smog still remains an issue in urban areas. Various smog chambers have been used to examine atmospheric processes of the formation of ozone and secondary organic aerosols. Prior to conduct smog chamber experiments, spectrum and intensity of light sources and chamber wall effects need to be characterized. Experimental techniques such as light intensity control, temperature control, comparison...
Aerosol samples (PM10) were collected using an aethalometer from 15 July 2001 to 18 April 2004 at the PICO-NARE site in Pico island, Azores, Portugal. The aethalometer is at an altitude of 2225 m AMSL, and sampled for 24 h in most cases, and for a few periods continuously. Samples were assessed through instrumental neutron activation analysis (k0-variant), and concentrations of up to 15...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.