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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Modeling normalcy-dominant ordinal time series: An application to air quality level
正态主导 有序时间序列 建模 空气质量水平
2023/5/10
Inspired by the study of air quality level data, we propose a new model for the normalcy-dominant ordinal time series. The proposed model is based on a new zero-one-inflated bounded Poisson distributi...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars： Modeling normalcy-dominant ordinal time series: An application to air quality level
正态主导 有序时间序列 建模 空气质量水平
2023/5/10
Inspired by the study of air quality level data, we propose a new model for the normalcy-dominant ordinal time series. The proposed model is based on a new zero-one-inflated bounded Poisson distributi...
Pandemic air quality due to weather, not just lockdowns ,study finds
meteorological pandemic air PM 2.5
2021/8/4
New research from Martin's lab, in collaboration with the Goddard Space Flight Center, California Institute of Technology and Dalhousie University in Nova Scotia, mapped PM2.5 levels across China, Eur...
Unexpected wildfire emissions impact air quality worldwide（图）
Unexpected wildfire emissionst air quality worldwide
2020/10/30
In lab studies of wildfire, nitrous acid seems to be a minor actor, often underrepresented in atmospheric models. But in the real-world atmosphere during wildfires, the chemical plays a leading role.I...
California's air quality regulations help farmers prosper（图）
California air quality regulations farmers prosper
2020/3/27
Farmers in California's Central Valley have seen a boost in the productivity of their high-value crops -- and greater earnings -- as a result of the Golden State's air pollution controls.Perennial cro...
Genetic modification of poplar trees saves air quality（图）
Genetic modification poplar trees air quality
2020/1/19
Poplar trees are widely used in commercial products, but, like several other tree species, they emit gases to the atmosphere that worsen air pollution and alter climate. Now field trials in Oregon and...
Spatiotemporal characteristics of urban air quality in China and geographic detection of their determinants
Air Quality Index (AQI) spatiotemporal characteristics geographic detector China
2018/4/9
Ambient air pollution brought by the rapid economic development and industrial production in China has exerted a significant influence on socio-economic activities and public health, especially in the...
More natural dust in the air improves air quality in eastern China
More natural dust air quality eastern China
2017/7/20
Man-made pollution in eastern China's cities worsens when less dust blows in from the Gobi Desert, according to a new study published May 11 in Nature Communications.Yes, you read that correctly: When...
A GIS-BASED APPROACH TO SPATIO-TEMPORAL ANALYSIS OF URBAN AIR QUALITY IN CHENGDU PLAIN
Geographical information science Statistical analysis Computer Vision Spatial-temporal analysis Air quality
2016/1/3
Environmental pollution of urban areas is one of key factors that state authorities and local agencies have to consider in the decisionmaking process. Understanding temporal and spatial distribution o...
Spatial Prediction of Transport Related Urban Air Quality
Quality Statistics Pollution Environment GIS
2015/12/3
The aim of this study is to explore the relationship between, transport, land-use and air quality and mapping of air pollutants by means of spatial information sciences, which would provide useful inf...
Air Quality and Ozone Pollution Models for Forested Areas May Be Too Simple
Air Quality Ozone Pollution Models Forested Areas Too Simple
2015/10/13
A new study assessing the influence of species diversity of canopy trees on the amount of ozone precursors a forest emits suggests that atmospheric chemistry models in use now may underestimate the im...
The promise of Beijing: Evaluating the impact of the 2008 Olympic Games on air quality
Air pollution Air quality
2015/9/21
To prepare for the 2008 Olympic Games, China adopted a number of radical measures
to improve air quality. Using the officially reported air pollution index (API) from 2000 to
2009, we show that thes...
This paper proposes a method of valuing air quality based on differences in
wages among cities. Using an urban location model it is shown that the supply of
labor to any city increases with the real...
Improving Air Quality in Metropolitan Mexico City: An Economic Valuation
Economic Valuation Metropolitan Mexico
2015/9/18
Mexico City has for years experienced high levels ofozone and particulate air pollution. In 1995-99 the entire population of the Mexico City metropolitan area was exposed to annual average concentrati...
Evolution of perturbations in 3D air quality models
perturbation growth automatic differentiation three-dimensional numerical models -sensitivity analysis air quality models
2015/9/16
The deterministic approach of sensitivity analysis is applied on the solution vector of an Air Quality Model. In
particular, the photochemical CAMx code is augmented with derivatives utilising the au...