ID: 874

AQSQID: 510590030

Site Name: Franconia

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

Updated: Sept. 22, 2021, 10:06 a.m.

Location: Alexandria (Groveton Heights), VA

Reporting: True, Located: True

Current AQI: 24.0

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
Sept. 15, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 15, 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 19.5 μg/m3 (67) 67.0
 
Sept. 15, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 19.6 μg/m3 (67) 67.0
 
Sept. 15, 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 19.3 μg/m3 (67) 67.0
 
Sept. 15, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 15, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 19.3 μg/m3 (67) 67.0
 
Sept. 15, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 19.1 μg/m3 (66) 66.0
 
Sept. 15, 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 18.1 μg/m3 (64) 64.0
 
Sept. 15, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 17.1 μg/m3 (62) 62.0
 
Sept. 14, 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 16.3 μg/m3 (60) 60.0
 
Sept. 14, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 15.5 μg/m3 (59) 59.0
 
Sept. 14, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A 15.5 μg/m3 (59) 59.0
 
Sept. 14, 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 15.5 μg/m3 (59) 59.0
 
Sept. 14, 2021, 7 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 51.0 ppb (48) N/A N/A 15.7 μg/m3 (59) 59.0
 
Sept. 14, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 15.8 μg/m3 (59) 59.0
 
Sept. 14, 2021, 4 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
 
Sept. 14, 2021, 3 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 42.0 ppb (39) N/A N/A 18.1 μg/m3 (64) 64.0
 
Sept. 14, 2021, 2 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 26.0 ppb (25) N/A N/A 19.1 μg/m3 (66) 66.0
 
Sept. 14, 2021, 1 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 7.0 ppb (7) N/A N/A 19.3 μg/m3 (67) 67.0
 
Sept. 14, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 2.0 ppb (2) N/A N/A 18.6 μg/m3 (65) 65.0
 
Sept. 14, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 1.0 ppb (1) N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 14, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 1.0 ppb (1) N/A N/A 19.1 μg/m3 (66) 66.0
 
Sept. 14, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 2.0 ppb (2) N/A N/A 18.7 μg/m3 (65) 65.0
 
Sept. 14, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 4.0 ppb (4) N/A N/A 18.3 μg/m3 (65) 65.0
 
Sept. 14, 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 16.3 μg/m3 (60) 60.0
 
Sept. 14, 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 16.5 μg/m3 (61) 61.0
 
Sept. 14, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 17.8 μg/m3 (63) 63.0
 
Sept. 14, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 17.3 μg/m3 (62) 62.0
 
Sept. 14, 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 17.6 μg/m3 (63) 63.0
 
Sept. 14, 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 16.4 μg/m3 (61) 61.0
 
Sept. 14, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 17.1 μg/m3 (62) 62.0
 
Sept. 14, 2021, midnight N/A N/A N/A N/A N/A 1.0 ppb (2) 40.0 ppb (38) N/A N/A 17.2 μg/m3 (62) 62.0
 
Sept. 13, 2021, 11 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 46.0 ppb (43) N/A N/A 16.9 μg/m3 (62) 62.0
 
Sept. 13, 2021, 10 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 49.0 ppb (46) N/A N/A 17.1 μg/m3 (62) 62.0
 
Sept. 13, 2021, 9 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 50.0 ppb (47) N/A N/A 16.3 μg/m3 (60) 60.0
 
Sept. 13, 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 16.2 μg/m3 (60) 60.0
 
Sept. 13, 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 15.3 μg/m3 (58) 58.0
 
Sept. 13, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (50) N/A N/A N/A 50.0
 
Sept. 13, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (49) N/A N/A 13.4 μg/m3 (54) 54.0
 
Sept. 13, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 12.2 μg/m3 (52) 52.0
 
Sept. 13, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 13, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 10.9 μg/m3 (46) 46.0
 
Sept. 13, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 14.0 ppb (13) N/A N/A 10.9 μg/m3 (46) 46.0
 
Sept. 13, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 10.9 μg/m3 (46) 46.0
 
Sept. 13, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 11.3 μg/m3 (48) 48.0
 
Sept. 13, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 11.3 μg/m3 (48) 48.0
 
Sept. 13, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 13, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 10.9 μg/m3 (46) 46.0
 
Sept. 13, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 10.3 μg/m3 (43) 43.0
 
Sept. 13, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 10.4 μg/m3 (44) 44.0
 
Sept. 13, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 10.1 μg/m3 (43) 43.0
 
Sept. 13, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 10.2 μg/m3 (43) 43.0
 
Sept. 13, 2021, 3 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
 
Sept. 13, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 9.9 μg/m3 (42) 42.0
 
Sept. 13, 2021, 1 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
 
Sept. 13, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 10.1 μg/m3 (43) 43.0
 
Sept. 12, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 9.5 μg/m3 (40) 40.0
 
Sept. 12, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 8.8 μg/m3 (37) 37.0
 
Sept. 12, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 8.7 μg/m3 (37) 37.0
 
Sept. 12, 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 8.6 μg/m3 (36) 39.0
 
Sept. 12, 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 8.3 μg/m3 (35) 38.0
 
Sept. 12, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 8.2 μg/m3 (35) 39.0
 
Sept. 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
 
Sept. 12, 2021, 4 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
 
Sept. 12, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 7.6 μg/m3 (32) 32.0
 
Sept. 12, 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 7.6 μg/m3 (32) 32.0
 
Sept. 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 7.7 μg/m3 (33) 33.0
 
Sept. 12, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 7.5 μg/m3 (32) 32.0
 
Sept. 12, 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 7.7 μg/m3 (33) 33.0
 
Sept. 12, 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 7.7 μg/m3 (33) 33.0
 
Sept. 12, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 7.4 μg/m3 (31) 31.0
 
Sept. 12, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 7.4 μg/m3 (31) 31.0
 
Sept. 12, 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 7.2 μg/m3 (31) 31.0
 
Sept. 12, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 7.1 μg/m3 (30) 30.0
 
Sept. 12, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 7.4 μg/m3 (31) 31.0
 
Sept. 12, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 7.1 μg/m3 (30) 30.0
 
Sept. 12, 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 7.4 μg/m3 (31) 31.0
 
Sept. 12, 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 7.3 μg/m3 (31) 31.0
 
Sept. 12, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 7.3 μg/m3 (31) 31.0
 
Sept. 12, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 7.4 μg/m3 (31) 31.0
 
Sept. 11, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 6.2 μg/m3 (26) 27.0
 
Sept. 11, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
Sept. 11, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 5.6 μg/m3 (24) 35.0
 
Sept. 11, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 5.7 μg/m3 (24) 38.0
 
Sept. 11, 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 5.9 μg/m3 (25) 39.0
 
Sept. 11, 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 6.0 μg/m3 (25) 41.0
 
Sept. 11, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 5.1 μg/m3 (22) 40.0
 
Sept. 11, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 5.2 μg/m3 (22) 39.0
 
Sept. 11, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 5.9 μg/m3 (25) 34.0
 
Sept. 11, 2021, 2 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 22.0 ppb (21) N/A N/A 6.9 μg/m3 (29) 29.0
 
Sept. 11, 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 6.5 μg/m3 (28) 28.0
 
Sept. 11, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 14.0 ppb (13) N/A N/A 6.8 μg/m3 (29) 29.0
 
Sept. 11, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 5.0 ppb (5) N/A N/A 7.3 μg/m3 (31) 31.0
 
Sept. 11, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 11.0 ppb (11) N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 11, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 8.0 ppb (8) N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 11, 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 7.1 μg/m3 (30) 30.0
 
Sept. 11, 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 8.3 μg/m3 (35) 35.0
 
Sept. 11, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 13.0 ppb (13) N/A N/A 8.1 μg/m3 (34) 34.0
 
Sept. 11, 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 7.7 μg/m3 (33) 33.0
 
Sept. 11, 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 6.9 μg/m3 (29) 29.0
 
Sept. 11, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 7.4 μg/m3 (31) 31.0
 
Sept. 11, 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 7.7 μg/m3 (33) 33.0
 
Sept. 11, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 5.9 μg/m3 (25) 25.0
 
Sept. 11, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 5.4 μg/m3 (23) 25.0
 
Sept. 10, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 5.3 μg/m3 (23) 29.0
 
Sept. 10, 2021, 10 p.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
 
Sept. 10, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 4.9 μg/m3 (21) 37.0
 
Sept. 10, 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 4.8 μg/m3 (20) 36.0
 
Sept. 10, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 4.7 μg/m3 (20) 35.0
 
Sept. 10, 2021, 6 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
 
Sept. 10, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 4.9 μg/m3 (21) 33.0
 
Sept. 10, 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 5.4 μg/m3 (23) 32.0
 
Sept. 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 5.1 μg/m3 (22) 28.0
 
Sept. 10, 2021, 2 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 28.0 ppb (26) N/A N/A 4.9 μg/m3 (21) 26.0
 
Sept. 10, 2021, 1 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 24.0 ppb (23) N/A N/A 4.6 μg/m3 (20) 23.0
 
Sept. 10, 2021, noon N/A N/A N/A N/A N/A 1.0 ppb (2) 23.0 ppb (22) N/A N/A 4.3 μg/m3 (18) 22.0
 
Sept. 10, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 4.1 μg/m3 (18) 22.0
 
Sept. 10, 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 3.8 μg/m3 (16) 25.0
 
Sept. 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 4.1 μg/m3 (18) 18.0
 
Sept. 10, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (27) N/A N/A 4.5 μg/m3 (19) 27.0
 
Sept. 10, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 4.6 μg/m3 (20) 29.0
 
Sept. 10, 2021, 6 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 31.0 ppb (29) N/A N/A 4.8 μg/m3 (20) 29.0
 
Sept. 10, 2021, 5 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 32.0 ppb (30) N/A N/A 5.1 μg/m3 (22) 30.0
 
Sept. 10, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 5.3 μg/m3 (23) 28.0
 
Sept. 10, 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 5.8 μg/m3 (25) 27.0
 
Sept. 10, 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 6.3 μg/m3 (27) 28.0
 
Sept. 10, 2021, 1 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 34.0 ppb (32) N/A N/A 5.8 μg/m3 (25) 32.0
 
Sept. 10, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 6.6 μg/m3 (28) 29.0
 
Sept. 9, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 7.7 μg/m3 (33) 33.0
 
Sept. 9, 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 7.1 μg/m3 (30) 38.0
 
Sept. 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 7.4 μg/m3 (31) 40.0
 
Sept. 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 7.5 μg/m3 (32) 39.0
 
Sept. 9, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 7.1 μg/m3 (30) 38.0
 
Sept. 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 7.7 μg/m3 (33) 38.0
 
Sept. 9, 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 7.8 μg/m3 (33) 36.0
 
Sept. 9, 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 7.8 μg/m3 (33) 34.0
 
Sept. 9, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 8.1 μg/m3 (34) 34.0
 
Sept. 9, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 8.7 μg/m3 (37) 37.0
 
Sept. 9, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 9.3 μg/m3 (39) 39.0
 
Sept. 9, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 15.0 ppb (14) N/A N/A 9.9 μg/m3 (42) 42.0
 
Sept. 9, 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 9.2 μg/m3 (39) 39.0
 
Sept. 9, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 9.1 μg/m3 (38) 38.0
 
Sept. 9, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 8.6 μg/m3 (36) 36.0
 
Sept. 9, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 9, 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 7.5 μg/m3 (32) 34.0
 
Sept. 9, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 6.4 μg/m3 (27) 38.0
 
Sept. 9, 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 6.8 μg/m3 (29) 41.0
 
Sept. 9, 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 10.6 μg/m3 (45) 45.0
 
Sept. 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 10.6 μg/m3 (45) 45.0
 
Sept. 9, 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 10.4 μg/m3 (44) 44.0
 
Sept. 9, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 9.5 μg/m3 (40) 40.0
 
Sept. 9, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 9.4 μg/m3 (40) 40.0
 
Sept. 8, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 10.1 μg/m3 (43) 43.0
 
Sept. 8, 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 9.5 μg/m3 (40) 40.0
 
Sept. 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 10.1 μg/m3 (43) 43.0
 
Sept. 8, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 11.3 μg/m3 (48) 48.0
 
Sept. 8, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A 11.5 μg/m3 (48) 48.0
 
Sept. 8, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 12.6 μg/m3 (53) 53.0
 
Sept. 8, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 13.4 μg/m3 (54) 54.0
 
Sept. 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 13.7 μg/m3 (55) 55.0
 
Sept. 8, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 13.7 μg/m3 (55) 55.0
 
Sept. 8, 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 13.0 μg/m3 (53) 53.0
 
Sept. 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 12.4 μg/m3 (52) 52.0
 
Sept. 8, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 11.2 μg/m3 (47) 47.0
 
Sept. 8, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 10.3 μg/m3 (43) 43.0
 
Sept. 8, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 8, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 8, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 9.7 μg/m3 (41) 41.0