AIR QUALITY INDEX WEATHER NORTHWEST WEATHER OPERATIONS CENTER 200 PM PDT LOCATION: PORTLAND - SE LAFAYETTE TIME AQI CATEGORY POLLUTANT ==== === ======== ========= 2PM Tue 28 Good Ozone 1PM Tue 26 Good Ozone 12PM Tue 23 Good Ozone 11AM Tue 21 Good Ozone 10AM Tue 15 Good 24-Hour PM2.5 9AM Tue 18 Good Ozone 8AM Tue 18 Good Ozone 6AM Tue 20 Good Ozone 5AM Tue 21 Good Ozone 4AM Tue 24 Good Ozone 3AM Tue 26 Good Ozone 2AM Tue 29 Good Ozone 1AM Tue 31 Good Ozone 12AM Tue 33 Good Ozone 11PM Mon 35 Good Ozone 10PM Mon 35 Good Ozone 9PM Mon 36 Good Ozone 8PM Mon 36 Good Ozone 7PM Mon 36 Good Ozone 6PM Mon 36 Good Ozone 5PM Mon 34 Good Ozone 4PM Mon 32 Good Ozone 3PM Mon 30 Good Ozone 2PM Mon 29 Good Ozone 1PM Mon 27 Good Ozone 12PM Mon 25 Good Ozone 11AM Mon 23 Good Ozone 10AM Mon 23 Good Ozone 9AM Mon 23 Good Ozone 8AM Mon 25 Good Ozone 6AM Mon 28 Good Ozone 5AM Mon 30 Good Ozone 4AM Mon 32 Good Ozone 3AM Mon 32 Good Ozone 2AM Mon 33 Good Ozone 1AM Mon 33 Good Ozone 12AM Mon 33 Good Ozone 11PM Sun 33 Good Ozone 10PM Sun 33 Good Ozone 9PM Sun 33 Good Ozone 8PM Sun 33 Good Ozone 7PM Sun 34 Good Ozone 6PM Sun 35 Good Ozone 5PM Sun 36 Good Ozone 4PM Sun 37 Good Ozone 3PM Sun 37 Good Ozone 2PM Sun 37 Good Ozone 1PM Sun 36 Good Ozone 8AM Sat 53 Moderate 24-Hour PM2.5 $$