PurpleAir has the instruments around Palo Alto all dipping below 200 now--generally in the 170s and 180s. Best it's looked for a couple of days. Let's hope the trend continues.
PurpleAir has the instruments around Palo Alto all dipping below 200 now--generally in the 170s and 180s. Best it's looked for a couple of days. Let's hope the trend continues.