Skip to main content

Table 2 Ammonia (NH 3 ) concentrations measured and modelled at air quality stations and summary of modelled NH 3 concentrations at the residences

From: Perceived annoyance from environmental odors and association with atmospheric ammonia levels in non-urban residential communities: a cross-sectional study

Region NH3 concentration at the air quality station (μg/m3) Number of respondents (and %) exposed to different modelled NH3 concentration categories at their residences (μg/m3)
  Measured[a] Modeled[b] 0-0.5 0.5-1 1-1.5 1.5-2 2-2.5 2.5-3 3-3.5 >3.5
I 0.16 ± 0.00a 0.15 ± 0.01a 11 (100) 0 0 0 0 0 0 0
II 0.62 ± 0.03b 0.85 ± 0.15bc 0 7 (22) 14 (44) 8 (25) 3 (9) 0 0 0
III 0.53 ± 0.05b 0.90 ± 0.12c 0 13 (43) 10 (33) 4 (13) 1 (3) 1 (3) 0 1 (3)
IV 1.02 ± 0.02c 1.27 ± 0.16cd 0 0 8 (25) 8 (25) 10 (31) 3 (9) 3 (9) 0
V 1.34 ± 0.10d 1.54 ± 0.01d 0 0 0 1 (3) 18 (58) 6 (19) 1 (3) 5 (16)
VI N/A N/A 0 0 0 0 12 (27) 9 (20) 14 (32) 9 (20)
  1. [a] Annual averaged NH3 concentration measured at air quality stations in 2008 and 2009, average ± standard deviation.
  2. [b] NH3 concentration from emission-dispersion models at the location of the air quality station in 2008 and 2009, average ± standard deviation.
  3. Same letters within columns indicate no significant differences (P > 0.05).