Various embodiments for an exhaust gas treatment device are provided. In one example, the exhaust gas treatment device includes a first substrate coated with a low temperature catalyst configured to operate under a first, low temperature range. The exhaust gas treatment device further includes a second substrate coated with a high temperature catalyst positioned downstream of the first substrate, the high temperature catalyst configured to operate under a second, high temperature range. Further, in the first and second temperature ranges, particulate matter is oxidized at the second substrate.