A fresh air ventilation device for air pollution prevention includes a main body, a blower, a filtering and cleaning assembly, and a gas detection module. The blower is disposed in the main body to guide air convection and form a flow-guiding path. The filtering and cleaning assembly is disposed in the flow-guiding path to filter and clean an air pollution source in the air convection guided by the blower. The gas detection module is disposed in the flow-guiding path of the main body to detect the air pollution source and transmit a gas detection data.

According to an embodiment of the present application, there may be provided an air purification apparatus for purifying polluted air and discharging the purified air, which comprises a main pipe including a first flow path, a second flow path, a first filter, a first main area, and a second main area. The air purification apparatus can operate in a filtering mode in which at least some contaminants contained in the air flowing into the main pipe are collected by the first filter, or a cleaning mode in which at least some of the contaminants collected by the first filter in the filtering mode are removed, wherein an operation section in the cleaning mode of the air purification apparatus includes a firs section and a second section, the first section and the second section are divided on the basis of a first division time point, and the rate of change of temperature in the first main area is varied before and after the first division time point.

Methods and Systems are provided for detecting and quantifying regeneration events for diesel particulate filters in diesel engines. Parameters such as exhaust temperature, DPF differential pressure, and mass flow rates received from an engine management system are checked to determine if a regeneration is detected. If a regeneration event is detected, DPF differential pressures are logged and identified as pre-event differential pressures or post-event differential pressures. A soot burn quality value is determined using the pre-event and post-event differential pressures. The soot burn quality is used to score the soot burn and to generate alerts.