| Lag 0 | same day as A&E presentation |
| Lag 1 | day before A&E presentation |
| Lag 2 | two days before A&E presentation |
| Lag 0–2 | mean of PM10 levels from lag 0 to lag 2 |
| PM | atmospheric particulate matter |
| CVE | cardiovascular event |
| A&E | accident and emergency |
| CI | confidence interval |
| OR | odds ratio |
| ARPA | Lombardy Environmental Protection Agency |
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