I've been made redundant buy tretinoin cream baikal-pharmacy.com An increase of just 1 part per million of carbon monoxide, a clear odorless gas, raised the risk by 3.5 percent; an increase of 10 micrograms per cubic meter of particulate matter raised the risk 2 percent. The biggest risk was on the day the patient actually breathed in the polluted air. The only pollutant that didnâ?t affect this risk was ozone, they reported in the Lancet.