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- Title
Long Memory and Time Trends in Particulate Matter Pollution (PM2.5 and PM10) in the 50 U.S. States.
- Authors
GIL-ALANA, LUIS A.; YAYA, OLAOLUWA S.; AWOLAJA, OLADAPO G.; CRISTOFARO, LORENZO
- Abstract
This paper focuses on the analysis of the time series behavior of the air quality in the 50 U.S. states by looking at the statistical properties of particulate matter (PM10 and PM2.5) datasets. We use long daily time series of outdoor air quality indices to examine issues such as the degree of persistence as well as the existence of time trends in data. For this purpose, we use a long-memory fractionally integrated framework. The results show significant negative time trend coefficients in a number of states and evidence of long memory in the majority of the cases. In general, we observe heterogeneous results across counties though we notice higher degrees of persistence in the states on the west with respect to those on the east, where there is a general decreasing trend. It is hoped that the findings in the paper will continue to assist in quantitative evidence-based air quality regulation and policies.
- Subjects
PARTICULATE matter; TIME series analysis; AIR quality standards; AIR quality indexes; AIR quality; POLLUTION; PROPERTIES of matter
- Publication
Journal of Applied Meteorology & Climatology, 2020, Vol 59, Issue 8, p1351
- ISSN
1558-8424
- Publication type
Article
- DOI
10.1175/JAMC-D-20-0040.1