ID: 874

AQSQID: 510590030

Site Name: Franconia

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

Updated: June 18, 2021, 5:52 a.m.

Location: Alexandria (Groveton Heights), VA

Reporting: True, Located: True

Current AQI: 23.0

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
June 18, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 5.4 μg/m3 (23) 23.0
 
June 18, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 4.6 μg/m3 (20) 34.0
 
June 18, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A 4.3 μg/m3 (18) 43.0
 
June 18, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A 5.9 μg/m3 (25) 46.0
 
June 18, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 50.0 ppb (47) N/A N/A 4.3 μg/m3 (18) 47.0
 
June 17, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 52.0 ppb (49) N/A N/A 3.2 μg/m3 (14) 49.0
 
June 17, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 54.0 ppb (50) N/A N/A 3.3 μg/m3 (14) 50.0
 
June 17, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 54.0 ppb (50) N/A N/A 3.4 μg/m3 (15) 50.0
 
June 17, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 53.0 ppb (50) N/A N/A 3.7 μg/m3 (16) 50.0
 
June 17, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 52.0 ppb (49) N/A N/A 3.8 μg/m3 (16) 49.0
 
June 17, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 52.0 ppb (49) N/A N/A 3.9 μg/m3 (17) 49.0
 
June 17, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 52.0 ppb (49) N/A N/A 3.8 μg/m3 (16) 49.0
 
June 17, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (48) N/A N/A 3.8 μg/m3 (16) 48.0
 
June 17, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 3.8 μg/m3 (16) 45.0
 
June 17, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 4.2 μg/m3 (18) 41.0
 
June 17, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 3.8 μg/m3 (16) 38.0
 
June 17, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 3.7 μg/m3 (16) 34.0
 
June 17, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 3.9 μg/m3 (17) 30.0
 
June 17, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 4.1 μg/m3 (18) 26.0
 
June 17, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.1 μg/m3 (18) 29.0
 
June 17, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 4.3 μg/m3 (18) 30.0
 
June 17, 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 4.3 μg/m3 (18) 34.0
 
June 17, 2021, 6 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 37.0 ppb (35) N/A N/A 4.3 μg/m3 (18) 35.0
 
June 17, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 4.4 μg/m3 (19) 34.0
 
June 17, 2021, 4 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 40.0 ppb (38) N/A N/A 4.4 μg/m3 (19) 38.0
 
June 17, 2021, 3 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 43.0 ppb (40) N/A N/A 4.6 μg/m3 (20) 40.0
 
June 17, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 4.9 μg/m3 (21) 40.0
 
June 17, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A 6.8 μg/m3 (29) 43.0
 
June 17, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A 5.3 μg/m3 (23) 43.0
 
June 16, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 50.0 ppb (47) N/A N/A 3.9 μg/m3 (17) 47.0
 
June 16, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 50.0 ppb (47) N/A N/A 3.9 μg/m3 (17) 47.0
 
June 16, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 50.0 ppb (47) N/A N/A 3.8 μg/m3 (16) 47.0
 
June 16, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A 3.7 μg/m3 (16) 46.0
 
June 16, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 3.7 μg/m3 (16) 44.0
 
June 16, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 3.6 μg/m3 (16) 45.0
 
June 16, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A 3.5 μg/m3 (15) 46.0
 
June 16, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (48) N/A N/A 4.0 μg/m3 (17) 48.0
 
June 16, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 50.0 ppb (47) N/A N/A 4.1 μg/m3 (18) 47.0
 
June 16, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A 4.1 μg/m3 (18) 43.0
 
June 16, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 4.4 μg/m3 (19) 37.0
 
June 16, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 4.6 μg/m3 (20) 31.0
 
June 16, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 5.3 μg/m3 (23) 26.0
 
June 16, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 6.0 μg/m3 (25) 25.0
 
June 16, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
June 16, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 6.5 μg/m3 (28) 28.0
 
June 16, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 6.8 μg/m3 (29) 29.0
 
June 16, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 7.0 μg/m3 (30) 30.0
 
June 16, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 7.1 μg/m3 (30) 30.0
 
June 16, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 8.0 μg/m3 (34) 34.0
 
June 16, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 8.6 μg/m3 (36) 36.0
 
June 16, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 8.4 μg/m3 (36) 36.0
 
June 16, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 8.8 μg/m3 (37) 37.0
 
June 16, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 9.7 μg/m3 (41) 41.0
 
June 15, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 9.7 μg/m3 (41) 41.0
 
June 15, 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 9.6 μg/m3 (40) 40.0
 
June 15, 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 8.6 μg/m3 (36) 39.0
 
June 15, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 8.6 μg/m3 (36) 41.0
 
June 15, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 7.9 μg/m3 (33) 40.0
 
June 15, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 6.5 μg/m3 (28) 36.0
 
June 15, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A N/A 6.3 μg/m3 (27) 41.0
 
June 15, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 5.5 μg/m3 (23) 44.0
 
June 15, 2021, 3 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
 
June 15, 2021, 2 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
 
June 15, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 6.1 μg/m3 (26) 39.0
 
June 15, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 7.1 μg/m3 (30) 30.0
 
June 15, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 8.1 μg/m3 (34) 34.0
 
June 15, 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 8.4 μg/m3 (36) 36.0
 
June 15, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 9.2 μg/m3 (39) 39.0
 
June 15, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (24) N/A N/A 8.5 μg/m3 (36) 36.0
 
June 15, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 8.4 μg/m3 (36) 36.0
 
June 15, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 7.0 μg/m3 (30) 30.0
 
June 15, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 5.5 μg/m3 (23) 30.0
 
June 15, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 5.1 μg/m3 (22) 33.0
 
June 15, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 4.5 μg/m3 (19) 41.0
 
June 15, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 7.7 μg/m3 (33) 41.0
 
June 15, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 10.3 μg/m3 (43) 43.0
 
June 15, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 10.2 μg/m3 (43) 43.0
 
June 14, 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 9.6 μg/m3 (40) 42.0
 
June 14, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 9.2 μg/m3 (39) 45.0
 
June 14, 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 9.7 μg/m3 (41) 45.0
 
June 14, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A 10.2 μg/m3 (43) 46.0
 
June 14, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (48) N/A N/A 10.1 μg/m3 (43) 48.0
 
June 14, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 54.0 ppb (50) N/A N/A 10.3 μg/m3 (43) 50.0
 
June 14, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (48) N/A N/A 10.0 μg/m3 (42) 48.0
 
June 14, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 7.7 μg/m3 (33) 44.0
 
June 14, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 8.1 μg/m3 (34) 38.0
 
June 14, 2021, 2 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 29.0 ppb (27) N/A N/A 8.0 μg/m3 (34) 34.0
 
June 14, 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 6.4 μg/m3 (27) 27.0
 
June 14, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 5.2 μg/m3 (22) 25.0
 
June 14, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 5.0 μg/m3 (21) 21.0
 
June 14, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 5.1 μg/m3 (22) 22.0
 
June 14, 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 4.9 μg/m3 (21) 21.0
 
June 14, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 4.8 μg/m3 (20) 25.0
 
June 14, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 4.6 μg/m3 (20) 27.0
 
June 14, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 4.7 μg/m3 (20) 27.0
 
June 14, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 4.9 μg/m3 (21) 28.0
 
June 14, 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 5.6 μg/m3 (24) 27.0
 
June 14, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 6.0 μg/m3 (25) 27.0
 
June 14, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 6.1 μg/m3 (26) 28.0
 
June 14, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 6.9 μg/m3 (29) 29.0
 
June 14, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 7.3 μg/m3 (31) 31.0
 
June 13, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 7.1 μg/m3 (30) 30.0
 
June 13, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 7.1 μg/m3 (30) 30.0
 
June 13, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 7.2 μg/m3 (31) 31.0
 
June 13, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 7.0 μg/m3 (30) 30.0
 
June 13, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 6.9 μg/m3 (29) 29.0
 
June 13, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 7.6 μg/m3 (32) 33.0
 
June 13, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 6.4 μg/m3 (27) 29.0
 
June 13, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 6.2 μg/m3 (26) 28.0
 
June 13, 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 6.3 μg/m3 (27) 28.0
 
June 13, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 6.6 μg/m3 (28) 28.0
 
June 13, 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 6.0 μg/m3 (25) 25.0
 
June 13, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 5.6 μg/m3 (24) 24.0
 
June 13, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 6.2 μg/m3 (26) 26.0
 
June 13, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 10.0 ppb (10) N/A N/A 6.5 μg/m3 (28) 28.0
 
June 13, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 6.5 μg/m3 (28) 28.0
 
June 13, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 6.8 μg/m3 (29) 29.0
 
June 13, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 7.0 μg/m3 (30) 30.0
 
June 13, 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 7.0 μg/m3 (30) 30.0
 
June 13, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 7.7 μg/m3 (33) 33.0
 
June 13, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 7.5 μg/m3 (32) 32.0
 
June 13, 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 7.5 μg/m3 (32) 32.0
 
June 13, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 7.7 μg/m3 (33) 33.0
 
June 13, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 6.6 μg/m3 (28) 32.0
 
June 13, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 7.5 μg/m3 (32) 36.0
 
June 12, 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 7.2 μg/m3 (31) 41.0
 
June 12, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 7.3 μg/m3 (31) 45.0
 
June 12, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (46) N/A N/A 7.4 μg/m3 (31) 46.0
 
June 12, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (48) N/A N/A 7.4 μg/m3 (31) 48.0
 
June 12, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 53.0 ppb (50) N/A N/A 8.0 μg/m3 (34) 50.0
 
June 12, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 7.6 μg/m3 (32) 45.0
 
June 12, 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 7.8 μg/m3 (33) 38.0
 
June 12, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 7.9 μg/m3 (33) 33.0
 
June 12, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 8.7 μg/m3 (37) 37.0
 
June 12, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 8.4 μg/m3 (36) 36.0
 
June 12, 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 8.1 μg/m3 (34) 34.0
 
June 12, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 8.2 μg/m3 (35) 35.0
 
June 12, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 10.5 μg/m3 (44) 44.0
 
June 12, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 11.1 μg/m3 (47) 47.0
 
June 12, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
June 12, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A N/A 8.3 μg/m3 (35) 35.0
 
June 12, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 7.2 μg/m3 (31) 31.0
 
June 12, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 8.2 μg/m3 (35) 35.0
 
June 12, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 6.3 μg/m3 (27) 27.0
 
June 12, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 6.8 μg/m3 (29) 29.0
 
June 12, 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 5.8 μg/m3 (25) 25.0
 
June 12, 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 5.5 μg/m3 (23) 25.0
 
June 12, 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 6.7 μg/m3 (28) 28.0
 
June 12, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 6.5 μg/m3 (28) 28.0
 
June 11, 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 6.2 μg/m3 (26) 26.0
 
June 11, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 5.3 μg/m3 (23) 23.0
 
June 11, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 5.3 μg/m3 (23) 23.0
 
June 11, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 4.7 μg/m3 (20) 23.0
 
June 11, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 4.7 μg/m3 (20) 22.0
 
June 11, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 4.3 μg/m3 (18) 23.0
 
June 11, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 2.0 μg/m3 (9) 21.0
 
June 11, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 2.3 μg/m3 (10) 22.0
 
June 11, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 1.8 μg/m3 (8) 22.0
 
June 11, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 1.8 μg/m3 (8) 20.0
 
June 11, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 2.3 μg/m3 (10) 20.0
 
June 11, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 3.5 μg/m3 (15) 23.0
 
June 11, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 4.5 μg/m3 (19) 25.0
 
June 11, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 5.4 μg/m3 (23) 24.0
 
June 11, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 6.6 μg/m3 (28) 28.0
 
June 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 6.9 μg/m3 (29) 29.0
 
June 11, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 6.8 μg/m3 (29) 29.0
 
June 11, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 7.7 μg/m3 (33) 33.0
 
June 11, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 9.5 μg/m3 (40) 40.0