Obesity has become a primary health concern across the country: sixty percent of Americans are overweight. (sohoparenting.com)
Urban air quality continues to be a primary health concern as most of the world's population currently lives in urban areas (54 % in 2014), and percentage is projected to rise to 66 % by 2050; this is coupled with the fact that one of the main global sources of air pollution in cities is traffic emissions. (sciencedaily.com)
One of the primary health concerns about eating tuna is the fish's mercury level, although some types of tuna are low in mercury, reports U.S. Food and Drug Administration. (healthyeating.sfgate.com)