A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Trends and Variability of Ground-Level O3 in Connecticut over the Period 1981–1997
The temporal and spatial characteristics of ground-level (tropospheric) O3 measured at 10 monitoring stations in Connecticut were studied from 1981 to 1997. To detect the O3 trend caused by changes in precursor emissions, moving average filters and a linear least-squared regression model were used to eliminate the short-term variation and effects of temperature from raw time-series O3 data. The results showed a significant decrease in the number of days exceeding the National Ambient Air Quality Standards (NAAQS) and a small change in total O3 concentration. The analysis indicated that the variation of daily maximum O3, caused by changes in emissions, explained more than 10% of the total O3 variation in Bridgeport and East Hartford during the past 17 years. Meanwhile, a strong weekly cycle was also found in O3 time-series data, resulting in lower O3 concentration in urban areas than in nonur-ban areas, implying that land use and land cover have impacts on the spatial distribution of ground-level O3 in Connecticut.
Trends and Variability of Ground-Level O3 in Connecticut over the Period 1981–1997
The temporal and spatial characteristics of ground-level (tropospheric) O3 measured at 10 monitoring stations in Connecticut were studied from 1981 to 1997. To detect the O3 trend caused by changes in precursor emissions, moving average filters and a linear least-squared regression model were used to eliminate the short-term variation and effects of temperature from raw time-series O3 data. The results showed a significant decrease in the number of days exceeding the National Ambient Air Quality Standards (NAAQS) and a small change in total O3 concentration. The analysis indicated that the variation of daily maximum O3, caused by changes in emissions, explained more than 10% of the total O3 variation in Bridgeport and East Hartford during the past 17 years. Meanwhile, a strong weekly cycle was also found in O3 time-series data, resulting in lower O3 concentration in urban areas than in nonur-ban areas, implying that land use and land cover have impacts on the spatial distribution of ground-level O3 in Connecticut.
Trends and Variability of Ground-Level O3 in Connecticut over the Period 1981–1997
Yang, Jiansheng (author) / Miller, David R. (author)
Journal of the Air & Waste Management Association ; 52 ; 1354-1361
2002-12-01
8 pages
Article (Journal)
Electronic Resource
Unknown
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