Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Concentrations of selected urban-related volatile organic compounds (VOCs) (in ppbV). The sampling date was May 30, 2016, for Białowieża and Warsaw, and June 1, 2016, for Bóbrka. Significant differences between sites were tested by a Kruskal–Wallis H test (∗p ≤ 0.05, ∗∗p ≤ 0.01, ∗∗∗p ≤ 0.001, n = 3).
