Substances released in the atmosphere may travel long distances up to reach receptors, such as materials or living beings, where their impact is observed. Air trajectories are a useful tool to investigate the origin of harmful substances, such as chemicals or radioactives, which can react or decay during their travel or even may be reinforced by the injections of sources located in their path. The scope of these analyses is not restrained to polluted environments; clean sites may also be potential targets to study the influence of long-range transport, and, on the contrary, clean flows affecting to the polluted sites may be identified. Moreover, some features of airflow, such as recirculation processes, or the influence of orographic elements may be revealed with this analysis. Since trajectories cover a wide range of scales from planetary circulations up to coastal breezes, procedures used to calculate and to analyze them have the greatest interest from a practical point of view.

We invite authors to submit original papers and review articles to improve the knowledge on air trajectories. We are particularly interested in articles describing applications where transport of chemicals or the influence of airflow was proven with observations.

Potential topics include, but are not limited to:

• Identification of point and extended sources
• Recirculation processes
• Long-range transport
• Data analysis procedures
• Transport observation
• Influence of meteorology on biosphere
• Comparison of trajectory calculations
• Estimation of moisture sources
• Effects of air trajectories on human health

Before submission authors should carefully read over the journal’s Author Guidelines, which are located at http://www.hindawi.com/journals/amete/guidelines/. Prospective authors should submit an electronic copy of their complete manuscript through the journal Manuscript Tracking System at http://mts.hindawi.com/submit/journals/amete/traj/ according to the following timetable: