Bosch announced a new gas sensor BME688
"The gas sensor can detect Volatile Organic Compounds (VOCs), volatile sulfur compounds (VSCs) and other gases such as carbon monoxide and hydrogen in the part per billion (ppb) range. "
While VOCs are supported by Sensirion SEN55 as well (at least as a index value), it could be handy to detect other gases. This will make it possible to assign high PM levels to its origin (woodburning or barbecue or traffic)
Would be great to implement this sensor in the sensor.community firmware 