ID: 874

AQSQID: 510590030

Site Name: Franconia

Added: April 21, 2020, 6:24 p.m.

Updated: May 12, 2021, 2:45 a.m.

Location: Alexandria (Groveton Heights), VA

Reporting: True, Located: True

Current AQI: 42.0

Alexandria (Groveton Heights) VA, US: 38.771702, -77.108902

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 12, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A N/A 42.0
 
May 12, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A N/A 41.0
 
May 11, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A N/A 42.0
 
May 11, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A N/A 44.0
 
May 11, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A N/A 45.0
 
May 11, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A N/A 45.0
 
May 11, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A N/A 46.0
 
May 11, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A N/A 46.0
 
May 11, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A N/A 47.0
 
May 11, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A N/A 46.0
 
May 11, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A N/A 43.0
 
May 11, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A N/A 40.0
 
May 11, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.4 μg/m3 (15) 36.0
 
May 11, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 4.3 μg/m3 (18) 27.0
 
May 11, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 4.9 μg/m3 (21) 21.0
 
May 11, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 4.9 μg/m3 (21) 21.0
 
May 11, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 5.0 μg/m3 (21) 23.0
 
May 11, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 4.8 μg/m3 (20) 26.0
 
May 11, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 4.8 μg/m3 (20) 30.0
 
May 11, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.5 μg/m3 (19) 29.0
 
May 11, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 4.8 μg/m3 (20) 26.0
 
May 11, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 4.9 μg/m3 (21) 27.0
 
May 11, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 5.1 μg/m3 (22) 29.0
 
May 11, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 5.2 μg/m3 (22) 33.0
 
May 11, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 4.8 μg/m3 (20) 35.0
 
May 11, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 4.7 μg/m3 (20) 36.0
 
May 10, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 4.4 μg/m3 (19) 41.0
 
May 10, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A 3.7 μg/m3 (16) 42.0
 
May 10, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A 2.4 μg/m3 (10) 43.0
 
May 10, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 1.9 μg/m3 (8) 44.0
 
May 10, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A 1.7 μg/m3 (8) 43.0
 
May 10, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 1.9 μg/m3 (8) 41.0
 
May 10, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 1.5 μg/m3 (7) 38.0
 
May 10, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 1.3 μg/m3 (6) 34.0
 
May 10, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 1.7 μg/m3 (8) 28.0
 
May 10, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 3.5 μg/m3 (15) 25.0
 
May 10, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 3.1 μg/m3 (13) 24.0
 
May 10, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 0.8 μg/m3 (4) 25.0
 
May 10, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 0.7 μg/m3 (3) 28.0
 
May 10, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 1.4 μg/m3 (6) 27.0
 
May 10, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 2.3 μg/m3 (10) 10.0
 
May 10, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (28) N/A N/A 3.4 μg/m3 (15) 28.0
 
May 10, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
May 10, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A 7.0 μg/m3 (30) 42.0
 
May 10, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 8.3 μg/m3 (35) 41.0
 
May 10, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 7.8 μg/m3 (33) 36.0
 
May 10, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 6.2 μg/m3 (26) 29.0
 
May 10, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 5.2 μg/m3 (22) 32.0
 
May 10, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 5.4 μg/m3 (23) 38.0
 
May 10, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 5.0 μg/m3 (21) 38.0
 
May 9, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 5.1 μg/m3 (22) 39.0
 
May 9, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 6.3 μg/m3 (27) 38.0
 
May 9, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 5.2 μg/m3 (22) 40.0
 
May 9, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 4.4 μg/m3 (19) 39.0
 
May 9, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 3.9 μg/m3 (17) 39.0
 
May 9, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 3.5 μg/m3 (15) 38.0
 
May 9, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 3.1 μg/m3 (13) 37.0
 
May 9, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.1 μg/m3 (13) 36.0
 
May 9, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 3.7 μg/m3 (16) 33.0
 
May 9, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 4.2 μg/m3 (18) 26.0
 
May 9, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 4.5 μg/m3 (19) 19.0
 
May 9, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 4.8 μg/m3 (20) 20.0
 
May 9, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 13.0 ppb (13) N/A N/A 5.2 μg/m3 (22) 22.0
 
May 9, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 14.0 ppb (13) N/A N/A 5.5 μg/m3 (23) 23.0
 
May 9, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 5.3 μg/m3 (23) 23.0
 
May 9, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 5.4 μg/m3 (23) 23.0
 
May 9, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 5.4 μg/m3 (23) 23.0
 
May 9, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 7.1 μg/m3 (30) 30.0
 
May 9, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 15.0 ppb (14) N/A N/A 6.8 μg/m3 (29) 29.0
 
May 9, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 5.1 μg/m3 (22) 22.0
 
May 9, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 5.3 μg/m3 (23) 25.0
 
May 9, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 6.2 μg/m3 (26) 26.0
 
May 9, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 4.6 μg/m3 (20) 26.0
 
May 9, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 3.5 μg/m3 (15) 34.0
 
May 8, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 2.3 μg/m3 (10) 38.0
 
May 8, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 2.5 μg/m3 (11) 38.0
 
May 8, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 2.7 μg/m3 (12) 38.0
 
May 8, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 2.9 μg/m3 (13) 38.0
 
May 8, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 3.2 μg/m3 (14) 39.0
 
May 8, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 3.6 μg/m3 (16) 38.0
 
May 8, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 3.5 μg/m3 (15) 39.0
 
May 8, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 3.6 μg/m3 (16) 40.0
 
May 8, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 3.8 μg/m3 (16) 38.0
 
May 8, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 3.9 μg/m3 (17) 33.0
 
May 8, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 4.1 μg/m3 (18) 25.0
 
May 8, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 5.3 μg/m3 (23) 23.0
 
May 8, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 9.0 ppb (9) N/A N/A 4.8 μg/m3 (20) 20.0
 
May 8, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 4.4 μg/m3 (19) 19.0
 
May 8, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 9.0 ppb (9) N/A N/A 4.6 μg/m3 (20) 20.0
 
May 8, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 11.0 ppb (11) N/A N/A 4.4 μg/m3 (19) 19.0
 
May 8, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 13.0 ppb (13) N/A N/A 4.4 μg/m3 (19) 19.0
 
May 8, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 4.8 μg/m3 (20) 20.0
 
May 8, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 13.0 ppb (13) N/A N/A 5.1 μg/m3 (22) 22.0
 
May 8, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 4.2 μg/m3 (18) 18.0
 
May 8, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 3.6 μg/m3 (16) 24.0
 
May 8, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 3.6 μg/m3 (16) 25.0
 
May 8, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
May 8, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 5.1 μg/m3 (22) 24.0
 
May 7, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 4.9 μg/m3 (21) 23.0
 
May 7, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.3 μg/m3 (18) 29.0
 
May 7, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 4.2 μg/m3 (18) 31.0
 
May 7, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.7 μg/m3 (16) 36.0
 
May 7, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 3.7 μg/m3 (16) 37.0
 
May 7, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 4.1 μg/m3 (18) 38.0
 
May 7, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 4.0 μg/m3 (17) 38.0
 
May 7, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 4.0 μg/m3 (17) 37.0
 
May 7, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 4.3 μg/m3 (18) 33.0
 
May 7, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.3 μg/m3 (18) 29.0
 
May 7, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 5.9 μg/m3 (25) 25.0
 
May 7, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 4.0 ppb (4) N/A N/A 7.2 μg/m3 (31) 31.0
 
May 7, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 8.0 ppb (8) N/A N/A 5.8 μg/m3 (25) 25.0
 
May 7, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 7.0 ppb (7) N/A N/A 5.8 μg/m3 (25) 25.0
 
May 7, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 5.6 μg/m3 (24) 24.0
 
May 7, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (10) N/A N/A 5.4 μg/m3 (23) 23.0
 
May 7, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 7.0 ppb (7) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 7, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 10.0 ppb (10) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 7, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 4.7 μg/m3 (20) 20.0
 
May 7, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 5.5 μg/m3 (23) 23.0
 
May 7, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 5.1 μg/m3 (22) 25.0
 
May 7, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 4.2 μg/m3 (18) 31.0
 
May 7, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 3.5 μg/m3 (15) 35.0
 
May 7, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.6 μg/m3 (16) 36.0
 
May 6, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.6 μg/m3 (16) 36.0
 
May 6, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 3.4 μg/m3 (15) 38.0
 
May 6, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 3.4 μg/m3 (15) 39.0
 
May 6, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 3.4 μg/m3 (15) 38.0
 
May 6, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 3.5 μg/m3 (15) 38.0
 
May 6, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 3.4 μg/m3 (15) 38.0
 
May 6, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.0 μg/m3 (13) 36.0
 
May 6, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 2.5 μg/m3 (11) 34.0
 
May 6, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 2.3 μg/m3 (10) 33.0
 
May 6, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 2.1 μg/m3 (9) 31.0
 
May 6, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 2.0 μg/m3 (9) 29.0
 
May 6, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 2.1 μg/m3 (9) 27.0
 
May 6, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 2.4 μg/m3 (10) 25.0
 
May 6, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 2.2 μg/m3 (10) 25.0
 
May 6, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 2.7 μg/m3 (12) 25.0
 
May 6, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 2.6 μg/m3 (11) 27.0
 
May 6, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 2.5 μg/m3 (11) 30.0
 
May 6, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 3.3 μg/m3 (14) 32.0
 
May 6, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 4.1 μg/m3 (18) 31.0
 
May 6, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 4.2 μg/m3 (18) 30.0
 
May 6, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.5 μg/m3 (19) 29.0
 
May 6, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.5 μg/m3 (19) 29.0
 
May 6, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.4 μg/m3 (19) 29.0
 
May 6, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 4.5 μg/m3 (19) 31.0
 
May 5, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 3.9 μg/m3 (17) 34.0
 
May 5, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.8 μg/m3 (16) 36.0
 
May 5, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 2.5 μg/m3 (11) 36.0
 
May 5, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 3.0 μg/m3 (13) 37.0
 
May 5, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 2.7 μg/m3 (12) 39.0
 
May 5, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 3.9 μg/m3 (17) 38.0
 
May 5, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 4.1 μg/m3 (18) 38.0
 
May 5, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 4.7 μg/m3 (20) 34.0
 
May 5, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 6.9 μg/m3 (29) 29.0
 
May 5, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 8.0 ppb (8) N/A N/A 7.4 μg/m3 (31) 31.0
 
May 5, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 4.0 ppb (4) N/A N/A 7.5 μg/m3 (32) 32.0
 
May 5, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 4.0 ppb (4) N/A N/A 7.9 μg/m3 (33) 33.0
 
May 5, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 6.0 ppb (6) N/A N/A 7.7 μg/m3 (33) 33.0
 
May 5, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 7.0 ppb (7) N/A N/A 6.8 μg/m3 (29) 29.0
 
May 5, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 9.0 ppb (9) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 5, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 5.0 ppb (5) N/A N/A 4.4 μg/m3 (19) 19.0
 
May 5, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 10.0 ppb (10) N/A N/A 4.1 μg/m3 (18) 18.0
 
May 5, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 9.0 ppb (9) N/A N/A 5.3 μg/m3 (23) 23.0
 
May 5, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 15.0 ppb (14) N/A N/A 6.2 μg/m3 (26) 26.0
 
May 5, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 5.7 μg/m3 (24) 24.0
 
May 5, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 15.0 ppb (14) N/A N/A 5.2 μg/m3 (22) 22.0
 
May 5, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 4.9 μg/m3 (21) 21.0