In addition the most representative sampling locations are often at a distance from the shore or bank increasing the logistic complexity.

Improvements in measurement techniques and technology, as well as more sampling locations have reduced the global mean uncertainty since the mid 1990s.

Sometimes the source of a pollutant can be identified by changes in pollution concentration between different sampling locations.

The procedure may be applied in-situ, remotely, or ex-situ with respect to the sampling location.

The network has grown to include over 20 sampling locations and an additional 20 other trace gases of atmospheric interest.

The use of passive samplers greatly reduces the cost and the need of infrastructure on the sampling location.

His team is still identifying new sampling locations and analyzing data so that its key findings can be submitted for peer review.

For each designated point a specific sampling location was identified based on the results of the homogeneity exercise.

The combined data is calculated by first interpolating missing data at a sampling location for each measurement program.

Sampling should be done on a minimum of 8 different sampling locations.