They used air pollution data from monitors in each city to calculate daily maximum concentrations of ozone, a normal component of the earth's upper atmosphere that becomes a danger when concentrated at ground level.
There's nothing that bonds people like shared enjoyment of a food; the perceived danger of concentrated capsaicin, the chemical that conveys the feeling of spiciness, only heightens that connection.
But a handful of hits to players' heads within a few hours last Sunday, one day after a Rutgers player was paralyzed by a helmet-first collision, concentrated attention on the danger that the N.F.L. wants to eliminate.
The dangers posed by concentrated ownership go beyond news and censorship issues, to the heart of popular culture itself.
There are also health dangers associated with concentrated forms of natural uranium, and since little is secure in Iraq, officials wanted to remove it.
Having never sunburned in my life, I didn't give a thought to the dangers of the concentrated UV rays penetrating my young skin.
Combined with faltering economies and the threat of Islamic extremism, this concentrated leaders' minds on the danger of letting old wounds fester.
"Who would have thought five years ago, after we witnessed firsthand the dangers of an overly concentrated financial system, that the 'too big to fail' problem would only have gotten worse?" Warren urged the passage of a new Glass-Steagall Act that would separate commercial and investment banking.
As such, Russia is in imminent danger of moving from a "concentrated epidemic" of HIV, with the virus confined to one subset of the population, into a "generalised epidemic", with the virus proliferating throughout wider society.
Citizens United explicitly rejected Marshall's warning regarding the dangers posed by the impact of concentrated wealth on the political process.
Risk is more concentrated than ever.
