Table 2: The number of observations, nickel, and vanadium mean concentrations (±standard error), their ratio, and the increase of winter Ni above summer Ni in NYC and vicinity at each location discussed in this work.

From: Residual oil combustion: a major source of airborne nickel in New York City

Site nameNo. of Obs.SeasonMean valueΔNi (winter-summer) (ng/m3)
   Ni±SE (ng/m3)V±SE (ng/m3)Ni/V 
West of NYC (NJ, Sterling Forest)
 Camden, NJ183Winter4.5±0.06.8±0.10.671.31
 352Summer3.2±0.05.5±0.10.58 
 Trenton, NJ317Winter3.5±0.03.1±0.01.150.92
 589Summer2.6±0.02.4±0.01.10 
 Chester, NJ200Winter2.2±0.01.8±0.01.21−0.06
 364Summer2.3±0.11.9±0.01.20 
 Elizabeth, NJ201Winter5.9±0.07.0±0.10.840.81
 370Summer5.1±0.17.4±0.10.69 
 Brigantine NWR271Winter1.4±0.03.0±0.00.460.26
 460Summer1.1±0.03.4±0.00.34 
 Sterling forest364Winter8.0±0.14.0±0.01.990.32
 196Summer7.6±0.14.5±0.01.72 
       
New York City
 Canal street201Winter17.9±0.28.0±0.12.2410.56
 333Summer7.3±0.17.3±0.10.99 
 IS52, Bronx261Winter18.7±0.17.1±0.02.6411.35
 435Summer7.4±0.15.7±0.01.30 
 IS52, Bronx111Winter22.5±0.17.5±0.03.0012.86
 184Summer9.6±0.15.5±0.01.76 
 Bronx bot. gardens223Winter29.4±0.18.2±0.03.6018.27
 384Summer11.1±0.04.8±0.02.30 
 Hunter college400Winter35.6±0.110.6±0.03.3619.28
 603Summer16.3±0.08.9±0.01.83 
 NYU Central monitor77Winter50.1±0.312.4±0.14.0533.24
 91Summer16.8±0.15.9±0.02.86 
 NYU home study89Winter42.5±0.314.0±0.13.0327.20
 92Summer15.3±0.18.9±0.11.72 
 Queens CC242Winter18.6±0.17.2±0.02.5612.02
 445Summer6.6±0.05.7±0.01.15 
       
East of NYC (CT)
 New Haven (STN)101Winter5.8±0.08.7±0.10.66−0.55
 205Summer6.3±0.114.3±0.20.44 
 New Haven (IMP)31Winter5.7±0.24.7±0.11.202.25
 43Summer3.4±0.25.1±0.20.66 
 Mohawk Mtn.246Winter1.2±0.01.6±0.00.77−0.13
 400Summer1.3±0.01.8±0.00.74 
 Westport39Winter2.4±0.32.7±0.30.89−0.07
 72Summer2.5±0.33.1±0.30.80 
  1. Bot., botanical; Ni, nickel; Obs., observation; NYC, New York City; NYU, The New York University; STN, Speciation Trends Network; V, vanadium.