From: Low level air pollution and exacerbation of existing copd: a case crossover analysis
SO2 a | NO2 a | PM2.5 a | Temperatureb | |
---|---|---|---|---|
NO2 a | Spring: 0.14 | -- | -- | -- |
Summer: −0.03 | ||||
Fall: 0.52** | ||||
Winter: 0.80** | ||||
PM2.5 a | Spring: 0.30** | Spring: 0.41** | -- | -- |
Summer: 0.20* | Summer: 0.45** | |||
Fall: 0.39** | Fall: 0.73** | |||
Winter: 0.79** | Winter: 0.83** | |||
Temperatureb | Spring: 0.34** | Spring: 0.02 | Spring: 0.52** | -- |
Summer: 0.24** | Summer: 0.15* | Summer: 0.62** | ||
Fall: 0.02 | Fall: −0.04 | Fall: −0.15* | ||
Winter: −0.13 | Winter: 0.09 | Winter: 0.11 | ||
Relative Humidityb | Spring: 0.09 | Spring: 0.07 | Spring: −0.01 | Spring: −0.25** |
Summer: −0.13 | Summer: 0.02 | Summer: −0.07 | Summer: 0.22** | |
Fall: −0.14* | Fall: −0.24** | Fall: −0.28** | Fall: 0.38** | |
Winter: −0.02 | Winter: 0.03 | Winter: 0.08 | Winter: 0.22** |