English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The acidity of precipitation in the northeastern United States has increased, probably as a result of anthropogenic emissions. Increases in New England and New York occurred primarily before the mid-1950's. Since the mid-1960's there has been no significant change in the acidity of precipitation in this region; however, nitrate concentrations may have increased and sulfate concentrations have decreased. Acidity of precipitation in the western United States is primarily the result of emissions from localized sources. Because these sources are established metropolitan areas, no time periods can be assigned to this acidification. Acidification of surface water generally has occurred in time frames compatible with the hypothesis that acidification of precipitation is the cause of the surface-water acidification; however, there are few examples of complementary data. Trends in surface-water acidification in Pennsylvania, New Jersey, North Carolina, the extreme northwestern United States, and the central Rocky Mountains support the hypothesis that precipitation recently has been acidified in these regions. 72 references, 4 figures, 2 tables.

An evaluation of trends in the acidity of precipitation and the related acidification of surface water in North America