Dr. Graham said that even though few people are complaining of insect bites this summer, the virus is showing up in greater concentrations of mosquitoes.
Metros with higher incomes, higher levels of education and greater concentrations of the creative class were healthier than those where less well-educated, working-class occupations predominated.
But at greater concentrations, above 70percentt, hydrogen peroxide can be used as a rocket propellent — or as an ingredient for explosives.
(They are considerably less expensive than precious metals because despite the names, they are found in much higher quantities and much greater concentrations than precious metal).
Lauren Brown, a botanist, said she finds greater concentrations and abundance of rare wildflowers on the Metacomet Ridge than anywhere else in Connecticut.
At 240,000 households, the region's share of those affected is 38% bigger than even its greater concentrations of low pay and unemployment would warrant.
At the margins of the desert are soils containing greater concentrations of organic matter.
If hair dye does play some role in lymphoma, Dr. Calle said, it would make sense that the darker colors, which have greater concentrations of ingredients, would have the strongest effect.
The earth below Kentucky's bluegrass is rich in limestone, which means greater concentrations of calcium and phosphorous, which means that horses grazing in its pastures receive ample supplies of vitamins and minerals to aid bone growth.
The combination of strong sunlight and the recirculation of air between southern England and the near continent for several days makes it likely it will form in greater concentrations over London.
But in greater concentrations it can harm the kidneys.
