. . .in particular, the country has extreme levels of nitrogen dioxide due to heavily congested roads in urban areas, ."there may be subtle differences (between animals and humans) that we don't know about," klein said. . . .anr is a not for profit organisation that relies on sponsors and donations. . http://lm360.us/Wilkenson-father-of-Kmiotek-from-Ondrejov?Comiskygr=180 .