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Air Pollution in Cities:
       
 
City Specific Area PM10, microg/m3, ave PM10, microg/m3, max O3, ppb, max NO2, ppb, ave SO2, ppb, ave CO, ppm, max
London Unknown8 13 46 74 29 3 -
Stockholm Unknown8 18 90 74 - - -
Gothenburg Unknown8 21 63 74 - - -
Copenhagen Unknown8 21 74 71 15 1 -
Budapest Unknown8 22 72 82 - - -
Dublin Unknown8 24 92 62 - - -
Washington District of Columbia2 24 56 110 20 8 4.5
Boston Suffolk County2 25 65 100 20 6 2.6
Bordeaux Unknown8 25 130 86 - - -
Lyon Unknown8 26 84 115 37 3 -
Paris Unknown8 27 95 94 - - -
New York New York County2 27 80 100 30 10 3.3
Singapore Unknown7 30 - - 18 9 -
Vienna Unknown8 30 87 81 19 3 -
City Specific Area PM10, microg/m3, ave PM10, microg/m3, max O3, ppb, max NO2, ppb, ave SO2, ppb, ave CO, ppm, max
Marseille Unknown8 31 69 109 - - -
Philadelphia Philadephia County2 31 86 100 20 6 3.9
Lisbon Unknown8 32 87 163 15 1 -
Madrid Unknown8 33 78 68 25 13 -
Chicago Cook County2 33 120 90 30 6 3.5
Prague Unknown8 34 123 90 19 5 -
Brussels Unknown8 37 194 94 24 5 -
Pittsburgh Allegheny County2 37 152 120 20 10 3.5
Tokyo Unknown7 38 - - 34 5 -
Barcelona Unknown8 40 97 43 - - -
Cracow Unknown8 42 206 72 24 8 -
Rotterdam Unknown8 43 105 116 - - -
Los Angeles Los Angeles County2 44 119 150 30 3 7.3
Saint Louis Saint Louis (city) County2 44 292 110 20 5 3.1
Seville Unknown8 46 70 69 - - -
City Specific Area PM10, microg/m3, ave PM10, microg/m3, max O3, ppb, max NO2, ppb, ave SO2, ppb, ave CO, ppm, max
Taipei City10 51 - - - 5 -
Hong Kong Unknown6 51 - - 36 11 -
San Diego San Diego County2 52 139 100 20 5 10.6
Bangkok Unknown3 55 - - 27 5 -
Daegu Shi-area9 56 - - 25 7 -
Detroit Wayne County2 56 219 100 20 6 3.5
Busan Unknown7 60 - - 31 9 -
Rome Unknown8 61 172 111 42 1 -
Phoenix Maricopa County2 62 240 100 30 3 6.2
Athens Unknown8 68 169 102 - 9 -
Seoul 25-gu1 69 245 69 38 5 3.4
City Specific Area PM10, microg/m3, ave PM10, microg/m3, max O3, ppb, max NO2, ppb, ave SO2, ppb, ave CO, ppm, max
Shanghai Unknown4 96 - - 36 19 -
Beijing Unknown5 140 - - 83 28 -
Death Valley Inyo County2 140 16,619
New Delhi Unknown7 160 - - 23 5 -
a The visibility varies inversely proportional with the level of PM2.5 (particulate matter of 2.5 microns or less) due to the visibility being mostly affected by light scattering of the smaller particules, and not light absorption by the larger ones. When the relative humidity is less than 70%, the visibility in km can be estimated as 1120/PM2.5 with PM2.5 in micrograms per cubic meter. As the relative humidity of the air increases beyong 70%, the water-soluble components of the fine particules can become bigger, with the radius increasing by up to 7 times for a relative humidity of 95% or more. This would increase the scattering and can result in a visibility range 2-3 times less than in dry conditions for the same level of PM2.5. The level of PM2.5 is generally 30% less than the one of PM10.
1 Sources: The yearly averages are found from the Korea Ministry of Environment, Environment White Paper, 2004 reproduced in a United Nations report on Atmosphere/Air Pollution in South Korea. The maximum daily values are obtained from "Infant Susceptibility of Mortality to Air Pollution in Seoul, South Korea", Eun-Hee Ha et al, Pediatrics Vol. 111 No. 2 February 2003, pp. 284-290. The concentrations correspond to the following: CO in ppm (maximum daily from 1995-1999), NO2 in ppb (yearly average in 2003), SO2 in ppb (yearly average in 2003), PM10 in micro-g per cubic meter (yearly average in 2003), O3 in ppb (maximum daily from 1995-1999).
2 Source: scorecard.org. The concentrations correspond to the following: CO in ppm (maximum 8-hour average in 2003), NO2 in ppb (2003 yearly average), SO2 in ppb (2003 yearly average), PM10 in micro-g per cubic meter (2003 yearly average), O3 in ppb (maximum 8 hour average in 2003).
3 Source: Pollution Control Department, Thailand, 2004; Data for year 2003.
4 Source: Shanghai Environmental Monitoring Center, 2004. Data for year 2003.
5 Source: Beijing Environmental Monitoring Center, 2004. Data for year 2003.
6 Source: Environmental Pollution Department, Hong Kong, SAR, 2004; Data for year 2004.
7 Source: cleanairnet.org for year 2000-2004.
8 Source: APHEIS 29 city report (data for years 2001 and 2002). The data for NO2 and SO2 is obtained from AIRBASE for the year 2000 (includes urban background stations, and excludes traffic stations).
9 Source: Daegu Regional Environmental Office. Date for year 2005. PM10 concentration per month: 60 (jan), 50 (feb), 69 (mar), 76 (apr), 60 (may), 63 (jun), 59 (jul), 43 (aug), 35 (sep), 45 (oct), 58 (nov), 53 (dec) micro-g per cubic meter.
10 Source: Taipei Yearbook. Date for year 2004.
 
 
 
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