As expected, higher concentrations were measured at the street site, with the average ratio of background-to-street concentration being 0.26 for nitrogen oxides (NOx) and 0.35, 0.42, 0.60, and 0.64 for CO, total PN, surface, and volume, respectively.
By mapping all of 311's graffiti complaints by neighborhood, Gothamist has created a handy guide that most likely best reflects which areas of New York City are most heavily tagged, but in so doing they passed along a link to a far more useful resource: GrafRank, a side that generates maps of cites' street art concentrations based on geo-located Flickr photos of graffiti.
Concentrations were highest in areas with third-quartile street density.
PM2.5 concentrations were inversely related to the distance to the nearest major road and, unexpectedly, to street density.
According to Mr. Tierney, north of 167th Street the concentration of simple walk-up buildings becomes stronger.
The basic problem is, in the argot of Wall Street, excessive concentration of risk -- or, in layman's terms, the placing of too many eggs in too few baskets.
In a column for the Israel National News website, he compared the liberal Jewish US lobby group J Street to concentration camp prisoner-guards and described its supporters as "smug advocates of Israel's destruction delivered from the comfort of their secure American sofas – it's hard to imagine anyone worse".
Additionally, pedestrians prefer streets with concentrations of similar types and high-density retails, affirming the agglomeration economies theory.
The system's design also considered the findings of the Pujo Committee's investigation of the possibility of a money trust in which Wall Street's concentration of influence over national financial matters was questioned and in which investment bankers were suspected of unusually deep involvement in the directorates of manufacturing corporations.
Street-side concentrations of all pollutants were higher on average than reference site concentrations while average benzene and BTEX levels at distributed sites showed higher concentrations and wider ranges than those reported at regulatory monitoring sites during the same period (Table 3).
