| ICD10 | International Classification of Disease, tenth revision |
| PM | particulate matter |
| PM10 | particulate matter less than 10 μm in aerodynamic diameter |
| PM2.5 | particulate matter less than 2.5 μm in aerodynamic diameter |
| SO2 | sulfur dioxide |
| NO2 | nitrogen dioxide |
| OR | odds ratio |
| CI | confidence interval |
| SD | standard deviation |
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