Limits...
Tempo-Spatial Variations of Ambient Ozone-Mortality Associations in the USA: Results from the NMMAPS Data

View Article: PubMed Central - PubMed

ABSTRACT

Although the health effects of ambient ozone have been widely assessed, their tempo-spatial variations remain unclear. We selected 20 communities (ten each from southern and northern USA) based on the US National Morbidity, Mortality, and Air Pollution Study (NMMAPS) dataset. A generalized linear model (GLM) was used to estimate the season-specific association between each 10 ppb (lag0-2 day average) increment in daily 8 h maximum ozone concentration and mortality in every community. The results showed that in the southern communities, a 10 ppb increment in ozone was linked to an increment of mortality of −0.07%, −0.17%, 0.40% and 0.27% in spring, summer, autumn and winter, respectively. For the northern communities, the excess risks (ERs) were 0.74%, 1.21%, 0.52% and −0.65% in the spring, summer, autumn and winter seasons, respectively. City-specific ozone-related mortality effects were positively related with latitude, but negatively related with seasonal average temperature in the spring, summer and autumn seasons. However, a reverse relationship was found in the winter. We concluded that there were different seasonal patterns of ozone effects on mortality between southern and northern US communities. Latitude and seasonal average temperature were identified as modifiers of the ambient ozone-related mortality risks.

No MeSH data available.


Meta-regression analysis on the associations of seasonal relative risk of ozone on mortality with city-specific absolute latitude, average temperature and RH.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5036684&req=5

ijerph-13-00851-f003: Meta-regression analysis on the associations of seasonal relative risk of ozone on mortality with city-specific absolute latitude, average temperature and RH.

Mentions: The meta-regression analyses show that city-specific latitude, TM and RH may be important modifiers of ozone effects on mortality. For example, in the spring season, the ozone effect was positively related to latitude increase (β = 0.09, 95% CI: 0.04 ~ 0.14), and negatively related to TM (β = −0.09, 95% CI: −0.15 ~ −0.03) as well as RH (β = −0.11, 95% CI: −0.20 ~ −0.05) in all communities. Similar results were also found in the summer and autumn seasons. However, in the winter season, reverse results were found. The ozone effect was negatively related to latitude increase (β = −0.04, 95% CI: −0.15 ~ 0.07), and was positively related to TM increase (β = 0.02, 95% CI: −0.07 ~ −0.12) in all communities, but these relationships were not statistically significant (Figure 3 and Table S2).


Tempo-Spatial Variations of Ambient Ozone-Mortality Associations in the USA: Results from the NMMAPS Data
Meta-regression analysis on the associations of seasonal relative risk of ozone on mortality with city-specific absolute latitude, average temperature and RH.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036684&req=5

ijerph-13-00851-f003: Meta-regression analysis on the associations of seasonal relative risk of ozone on mortality with city-specific absolute latitude, average temperature and RH.
Mentions: The meta-regression analyses show that city-specific latitude, TM and RH may be important modifiers of ozone effects on mortality. For example, in the spring season, the ozone effect was positively related to latitude increase (β = 0.09, 95% CI: 0.04 ~ 0.14), and negatively related to TM (β = −0.09, 95% CI: −0.15 ~ −0.03) as well as RH (β = −0.11, 95% CI: −0.20 ~ −0.05) in all communities. Similar results were also found in the summer and autumn seasons. However, in the winter season, reverse results were found. The ozone effect was negatively related to latitude increase (β = −0.04, 95% CI: −0.15 ~ 0.07), and was positively related to TM increase (β = 0.02, 95% CI: −0.07 ~ −0.12) in all communities, but these relationships were not statistically significant (Figure 3 and Table S2).

View Article: PubMed Central - PubMed

ABSTRACT

Although the health effects of ambient ozone have been widely assessed, their tempo-spatial variations remain unclear. We selected 20 communities (ten each from southern and northern USA) based on the US National Morbidity, Mortality, and Air Pollution Study (NMMAPS) dataset. A generalized linear model (GLM) was used to estimate the season-specific association between each 10 ppb (lag0-2 day average) increment in daily 8 h maximum ozone concentration and mortality in every community. The results showed that in the southern communities, a 10 ppb increment in ozone was linked to an increment of mortality of −0.07%, −0.17%, 0.40% and 0.27% in spring, summer, autumn and winter, respectively. For the northern communities, the excess risks (ERs) were 0.74%, 1.21%, 0.52% and −0.65% in the spring, summer, autumn and winter seasons, respectively. City-specific ozone-related mortality effects were positively related with latitude, but negatively related with seasonal average temperature in the spring, summer and autumn seasons. However, a reverse relationship was found in the winter. We concluded that there were different seasonal patterns of ozone effects on mortality between southern and northern US communities. Latitude and seasonal average temperature were identified as modifiers of the ambient ozone-related mortality risks.

No MeSH data available.