ID: 874

AQSQID: 510590030

Site Name: Franconia

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

Updated: Aug. 1, 2021, 3:54 a.m.

Location: Alexandria (Groveton Heights), VA

Reporting: True, Located: True

Current AQI: 39.0

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
Aug. 1, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 9.2 μg/m3 (39) 39.0
 
Aug. 1, 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 9.0 μg/m3 (38) 38.0
 
Aug. 1, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 8.9 μg/m3 (38) 38.0
 
July 31, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 8.6 μg/m3 (36) 36.0
 
July 31, 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 8.2 μg/m3 (35) 36.0
 
July 31, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 8.9 μg/m3 (38) 38.0
 
July 31, 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
 
July 31, 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 8.1 μg/m3 (34) 39.0
 
July 31, 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 6.6 μg/m3 (28) 38.0
 
July 31, 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 5.6 μg/m3 (24) 38.0
 
July 31, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 4.9 μg/m3 (21) 35.0
 
July 31, 2021, 3 p.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
 
July 31, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 4.8 μg/m3 (20) 27.0
 
July 31, 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 5.7 μg/m3 (24) 24.0
 
July 31, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 6.6 μg/m3 (28) 28.0
 
July 31, 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 8.2 μg/m3 (35) 35.0
 
July 31, 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 8.3 μg/m3 (35) 35.0
 
July 31, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 8.6 μg/m3 (36) 36.0
 
July 31, 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 9.4 μg/m3 (40) 40.0
 
July 31, 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 10.2 μg/m3 (43) 43.0
 
July 31, 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 11.9 μg/m3 (50) 50.0
 
July 31, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 13.9 μg/m3 (55) 55.0
 
July 31, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 15.2 μg/m3 (58) 58.0
 
July 31, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 16.2 μg/m3 (60) 60.0
 
July 31, 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 16.6 μg/m3 (61) 61.0
 
July 31, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 15.9 μg/m3 (59) 59.0
 
July 31, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 13.6 μg/m3 (55) 55.0
 
July 30, 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 12.3 μg/m3 (52) 52.0
 
July 30, 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 11.7 μg/m3 (49) 50.0
 
July 30, 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 12.1 μg/m3 (51) 51.0
 
July 30, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 54.0 ppb (50) N/A N/A 17.5 μg/m3 (63) 63.0
 
July 30, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 56.0 ppb (55) N/A N/A 23.0 μg/m3 (74) 74.0
 
July 30, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 56.0 ppb (55) N/A N/A 24.8 μg/m3 (78) 78.0
 
July 30, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (51) N/A N/A 23.5 μg/m3 (75) 75.0
 
July 30, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 57.0 ppb (58) N/A N/A 22.4 μg/m3 (73) 73.0
 
July 30, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 54.0 ppb (50) N/A N/A 20.8 μg/m3 (70) 70.0
 
July 30, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 53.0 ppb (50) N/A N/A 19.4 μg/m3 (67) 67.0
 
July 30, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 50.0 ppb (47) N/A N/A 17.5 μg/m3 (63) 63.0
 
July 30, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 15.7 μg/m3 (59) 59.0
 
July 30, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 15.3 μg/m3 (58) 58.0
 
July 30, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 16.4 μg/m3 (61) 61.0
 
July 30, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 17.7 μg/m3 (63) 63.0
 
July 30, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (24) N/A N/A 18.1 μg/m3 (64) 64.0
 
July 30, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 14.0 ppb (13) N/A N/A 17.7 μg/m3 (63) 63.0
 
July 30, 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 17.3 μg/m3 (62) 62.0
 
July 30, 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 15.9 μg/m3 (59) 59.0
 
July 30, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 16.7 μg/m3 (61) 61.0
 
July 30, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 17.3 μg/m3 (62) 62.0
 
July 30, 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 18.3 μg/m3 (65) 65.0
 
July 30, 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 19.2 μg/m3 (66) 66.0
 
July 30, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 19.9 μg/m3 (68) 68.0
 
July 29, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 23.2 μg/m3 (75) 75.0
 
July 29, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (41) N/A N/A 22.8 μg/m3 (74) 74.0
 
July 29, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 18.3 μg/m3 (65) 65.0
 
July 29, 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 18.4 μg/m3 (65) 65.0
 
July 29, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 19.3 μg/m3 (67) 67.0
 
July 29, 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 17.9 μg/m3 (64) 64.0
 
July 29, 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 17.3 μg/m3 (62) 62.0
 
July 29, 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 17.3 μg/m3 (62) 62.0
 
July 29, 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 17.4 μg/m3 (63) 63.0
 
July 29, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 16.9 μg/m3 (62) 62.0
 
July 29, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 17.7 μg/m3 (63) 63.0
 
July 29, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 18.3 μg/m3 (65) 65.0
 
July 29, 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 18.8 μg/m3 (66) 66.0
 
July 29, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 19.0 μg/m3 (66) 66.0
 
July 29, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 19.0 μg/m3 (66) 66.0
 
July 29, 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 18.1 μg/m3 (64) 64.0
 
July 29, 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 16.5 μg/m3 (61) 61.0
 
July 29, 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 13.1 μg/m3 (54) 54.0
 
July 29, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 9.9 μg/m3 (42) 42.0
 
July 29, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 10.7 μg/m3 (45) 45.0
 
July 29, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 66.0 ppb (87) N/A N/A 14.2 μg/m3 (56) 87.0
 
July 29, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 60.0 ppb (68) N/A N/A 18.9 μg/m3 (66) 68.0
 
July 29, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 66.0 ppb (87) N/A N/A 17.0 μg/m3 (62) 87.0
 
July 29, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 68.0 ppb (94) N/A N/A 16.9 μg/m3 (62) 94.0
 
July 28, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 77.0 ppb (105) N/A N/A 17.3 μg/m3 (62) 105.0
 
July 28, 2021, 10 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 80.0 ppb (106) N/A N/A 17.2 μg/m3 (62) 106.0
 
July 28, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 73.0 ppb (103) N/A N/A 16.9 μg/m3 (62) 103.0
 
July 28, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 70.0 ppb (100) N/A N/A 16.6 μg/m3 (61) 100.0
 
July 28, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 71.0 ppb (101) N/A N/A 18.0 μg/m3 (64) 101.0
 
July 28, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 71.0 ppb (101) N/A N/A 18.2 μg/m3 (64) 101.0
 
July 28, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 71.0 ppb (101) N/A N/A 17.7 μg/m3 (63) 101.0
 
July 28, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 72.0 ppb (102) N/A N/A 18.0 μg/m3 (64) 102.0
 
July 28, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 69.0 ppb (97) N/A N/A 17.0 μg/m3 (62) 97.0
 
July 28, 2021, 2 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 61.0 ppb (71) N/A N/A 17.3 μg/m3 (62) 71.0
 
July 28, 2021, 1 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 49.0 ppb (46) N/A N/A 16.8 μg/m3 (61) 61.0
 
July 28, 2021, noon N/A N/A N/A N/A N/A 1.0 ppb (2) 41.0 ppb (38) N/A N/A 16.2 μg/m3 (60) 60.0
 
July 28, 2021, 11 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 38.0 ppb (36) N/A N/A 15.9 μg/m3 (59) 59.0
 
July 28, 2021, 10 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 34.0 ppb (32) N/A N/A 15.6 μg/m3 (59) 59.0
 
July 28, 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 15.1 μg/m3 (58) 58.0
 
July 28, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 15.0 μg/m3 (58) 58.0
 
July 28, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 17.4 μg/m3 (63) 63.0
 
July 28, 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 19.4 μg/m3 (67) 67.0
 
July 28, 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 19.1 μg/m3 (66) 66.0
 
July 28, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 18.4 μg/m3 (65) 65.0
 
July 28, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 19.1 μg/m3 (66) 66.0
 
July 28, 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 16.0 μg/m3 (60) 60.0
 
July 28, 2021, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 53.0 ppb (50) N/A N/A 14.1 μg/m3 (56) 56.0
 
July 28, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 53.0 ppb (50) N/A N/A 14.4 μg/m3 (56) 56.0
 
July 27, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 59.0 ppb (65) N/A N/A 15.6 μg/m3 (59) 65.0
 
July 27, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 75.0 ppb (104) N/A N/A 19.4 μg/m3 (67) 104.0
 
July 27, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 78.0 ppb (105) N/A N/A 20.2 μg/m3 (69) 105.0
 
July 27, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 75.0 ppb (104) N/A N/A 20.6 μg/m3 (69) 104.0
 
July 27, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 74.0 ppb (103) N/A N/A 20.6 μg/m3 (69) 103.0
 
July 27, 2021, 6 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 71.0 ppb (101) N/A N/A 19.9 μg/m3 (68) 101.0
 
July 27, 2021, 5 p.m. N/A N/A N/A N/A N/A 1.0 ppb (2) 78.0 ppb (105) N/A N/A 19.0 μg/m3 (66) 105.0
 
July 27, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 81.0 ppb (107) N/A N/A 18.6 μg/m3 (65) 107.0
 
July 27, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 66.0 ppb (87) N/A N/A 16.7 μg/m3 (61) 87.0
 
July 27, 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 13.7 μg/m3 (55) 55.0
 
July 27, 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 11.2 μg/m3 (47) 47.0
 
July 27, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 11.0 ppb (11) N/A N/A 10.7 μg/m3 (45) 45.0
 
July 27, 2021, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 9.6 μg/m3 (40) 40.0
 
July 27, 2021, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 4.0 ppb (4) N/A N/A 10.8 μg/m3 (46) 46.0
 
July 27, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 11.9 μg/m3 (50) 50.0
 
July 27, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (14) N/A N/A 10.2 μg/m3 (43) 43.0
 
July 27, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 8.0 ppb (8) N/A N/A 9.8 μg/m3 (41) 41.0
 
July 27, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 8.0 ppb (8) N/A N/A 9.8 μg/m3 (41) 41.0
 
July 27, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 9.6 μg/m3 (40) 40.0
 
July 27, 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 9.1 μg/m3 (38) 38.0
 
July 27, 2021, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 8.8 μg/m3 (37) 37.0
 
July 27, 2021, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (39) N/A N/A 9.2 μg/m3 (39) 39.0
 
July 27, 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 6.8 μg/m3 (29) 36.0
 
July 27, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 55.0 ppb (51) N/A N/A 6.2 μg/m3 (26) 51.0
 
July 26, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 58.0 ppb (61) N/A N/A 14.3 μg/m3 (56) 61.0
 
July 26, 2021, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 61.0 ppb (71) N/A N/A 15.5 μg/m3 (59) 71.0
 
July 26, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 69.0 ppb (97) N/A N/A 14.8 μg/m3 (57) 97.0
 
July 26, 2021, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 71.0 ppb (101) N/A N/A 15.2 μg/m3 (58) 101.0
 
July 26, 2021, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 71.0 ppb (101) N/A N/A 15.6 μg/m3 (59) 101.0
 
July 26, 2021, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 71.0 ppb (101) N/A N/A 14.8 μg/m3 (57) 101.0
 
July 26, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 63.0 ppb (78) N/A N/A 13.9 μg/m3 (55) 78.0
 
July 26, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 62.0 ppb (74) N/A N/A 14.8 μg/m3 (57) 74.0
 
July 26, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 58.0 ppb (61) N/A N/A 16.0 μg/m3 (60) 61.0
 
July 26, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (48) N/A N/A 15.7 μg/m3 (59) 59.0
 
July 26, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A 15.5 μg/m3 (59) 59.0
 
July 26, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 13.8 μg/m3 (55) 55.0
 
July 26, 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 13.7 μg/m3 (55) 55.0
 
July 26, 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 13.8 μg/m3 (55) 55.0
 
July 26, 2021, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 13.6 μg/m3 (55) 55.0
 
July 26, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 14.1 μg/m3 (56) 56.0
 
July 26, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 14.7 μg/m3 (57) 57.0
 
July 26, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 15.4 μg/m3 (58) 58.0
 
July 26, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 15.7 μg/m3 (59) 59.0
 
July 26, 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 16.4 μg/m3 (61) 61.0
 
July 26, 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 16.7 μg/m3 (61) 61.0
 
July 26, 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 18.0 μg/m3 (64) 64.0
 
July 26, 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 19.0 μg/m3 (66) 66.0
 
July 26, 2021, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 18.9 μg/m3 (66) 66.0
 
July 25, 2021, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 18.7 μg/m3 (65) 65.0
 
July 25, 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 19.9 μg/m3 (68) 68.0
 
July 25, 2021, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 20.3 μg/m3 (69) 69.0
 
July 25, 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 20.2 μg/m3 (69) 69.0
 
July 25, 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 19.5 μg/m3 (67) 67.0
 
July 25, 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 18.9 μg/m3 (66) 66.0
 
July 25, 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 18.8 μg/m3 (66) 66.0
 
July 25, 2021, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 18.0 μg/m3 (64) 64.0
 
July 25, 2021, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 17.6 μg/m3 (63) 63.0
 
July 25, 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 17.4 μg/m3 (63) 63.0
 
July 25, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 16.4 μg/m3 (61) 61.0
 
July 25, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 15.6 μg/m3 (59) 59.0
 
July 25, 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 13.9 μg/m3 (55) 55.0
 
July 25, 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 12.8 μg/m3 (53) 53.0
 
July 25, 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 12.7 μg/m3 (53) 53.0
 
July 25, 2021, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 12.3 μg/m3 (52) 52.0
 
July 25, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 12.5 μg/m3 (52) 52.0
 
July 25, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 12.3 μg/m3 (52) 52.0
 
July 25, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 12.2 μg/m3 (52) 52.0
 
July 25, 2021, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 12.0 μg/m3 (50) 50.0
 
July 25, 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 11.5 μg/m3 (48) 48.0