AQSQID: 245100040

Site Name: Oldtown

Location: Baltimore (Old Town), MD

Reporting: True, Located: True

Current AQI: 68.0

Baltimore (Old Town) MD, US: 39.2981, -76.604698

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 24, 2020, 1 a.m. 71.2 ppb (68) 28.6 ppb (26) N/A 43.0 ppb (40) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 68.0
 
Jan. 24, 2020, midnight 70.4 ppb (67) 27.5 ppb (25) N/A 43.0 ppb (40) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 67.0
 
Jan. 23, 2020, 11 p.m. 48.5 ppb (45) 9.7 ppb (9) N/A 39.0 ppb (36) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 59.0
 
Jan. 23, 2020, 10 p.m. 49.5 ppb (46) 10.4 ppb (10) N/A 39.0 ppb (36) N/A N/A N/A N/A N/A 19.0 μg/m3 (65) 65.0
 
Jan. 23, 2020, 9 p.m. 61.2 ppb (58) 19.0 ppb (18) N/A 42.0 ppb (39) N/A N/A N/A N/A N/A 41.0 μg/m3 (114) 114.0
 
Jan. 23, 2020, 8 p.m. 47.9 ppb (44) 16.4 ppb (15) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 56.0
 
Jan. 23, 2020, 7 p.m. 63.0 ppb (60) 27.9 ppb (26) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 61.0
 
Jan. 23, 2020, 6 p.m. 78.1 ppb (76) 38.5 ppb (36) N/A 40.0 ppb (37) N/A N/A N/A N/A N/A 25.0 μg/m3 (78) 78.0
 
Jan. 23, 2020, 5 p.m. 93.8 ppb (92) 52.0 ppb (48) N/A 42.0 ppb (39) N/A N/A N/A N/A N/A 25.0 μg/m3 (78) 92.0
 
Jan. 23, 2020, 4 p.m. 126.8 ppb (105) 81.2 ppb (79) N/A 46.0 ppb (43) N/A N/A N/A N/A N/A 25.0 μg/m3 (78) 105.0
 
Jan. 23, 2020, 3 p.m. 187.3 ppb (117) 133.0 ppb (106) N/A 54.0 ppb (50) N/A N/A N/A N/A N/A 30.0 μg/m3 (88) 117.0
 
Jan. 23, 2020, 2 p.m. 182.4 ppb (116) 134.4 ppb (106) N/A 48.0 ppb (44) N/A N/A N/A N/A N/A 24.0 μg/m3 (76) 116.0
 
Jan. 23, 2020, 1 p.m. 215.4 ppb (122) 168.8 ppb (113) N/A 47.0 ppb (44) N/A N/A N/A N/A N/A N/A 122.0
 
Jan. 23, 2020, noon 161.8 ppb (112) 121.6 ppb (104) N/A 40.0 ppb (37) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 112.0
 
Jan. 23, 2020, 11 a.m. 183.8 ppb (116) 144.3 ppb (108) N/A 39.0 ppb (36) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 116.0
 
Jan. 23, 2020, 10 a.m. 143.2 ppb (108) 106.4 ppb (101) N/A 37.0 ppb (34) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 108.0
 
Jan. 23, 2020, 9 a.m. 141.8 ppb (108) 102.4 ppb (100) N/A 39.0 ppb (36) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 108.0
 
Jan. 23, 2020, 8 a.m. 126.3 ppb (105) 85.0 ppb (83) N/A 41.0 ppb (38) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 105.0
 
Jan. 23, 2020, 7 a.m. 129.3 ppb (105) 88.4 ppb (87) N/A 41.0 ppb (38) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 105.0
 
Jan. 23, 2020, 6 a.m. 139.4 ppb (107) 96.2 ppb (95) N/A 43.0 ppb (40) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 107.0
 
Jan. 23, 2020, 5 a.m. 122.3 ppb (104) 78.2 ppb (76) N/A 44.0 ppb (41) N/A N/A N/A N/A N/A 19.0 μg/m3 (65) 104.0
 
Jan. 23, 2020, 4 a.m. 122.7 ppb (104) 79.0 ppb (77) N/A 44.0 ppb (41) N/A N/A N/A N/A N/A 21.0 μg/m3 (69) 104.0
 
Jan. 23, 2020, 3 a.m. 82.7 ppb (81) 38.2 ppb (35) N/A 45.0 ppb (42) N/A N/A N/A N/A N/A 18.0 μg/m3 (63) 81.0
 
Jan. 23, 2020, 2 a.m. 70.6 ppb (68) 25.8 ppb (24) N/A 45.0 ppb (42) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 68.0
 
Jan. 23, 2020, 1 a.m. 52.1 ppb (48) 10.9 ppb (10) N/A 41.0 ppb (38) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 48.0
 
Jan. 23, 2020, midnight 40.1 ppb (37) 5.3 ppb (5) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Jan. 22, 2020, 11 p.m. 52.6 ppb (49) 11.1 ppb (10) N/A 41.0 ppb (38) N/A N/A N/A N/A N/A 14.0 μg/m3 (54) 54.0
 
Jan. 22, 2020, 10 p.m. 46.1 ppb (43) 8.3 ppb (8) N/A 38.0 ppb (35) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
Jan. 22, 2020, 9 p.m. 38.6 ppb (36) 9.9 ppb (9) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 36.0
 
Jan. 22, 2020, 8 p.m. 18.5 ppb (17) 5.7 ppb (5) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 22, 2020, 7 p.m. 17.1 ppb (16) 5.4 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 22, 2020, 6 p.m. 25.4 ppb (24) 9.7 ppb (9) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 24.0
 
Jan. 22, 2020, 5 p.m. 26.5 ppb (25) 10.3 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 4 p.m. 26.1 ppb (24) 10.0 ppb (9) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 3 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2020, 2 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 22, 2020, 1 p.m. 51.4 ppb (48) 19.5 ppb (18) N/A 32.0 ppb (30) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 48.0
 
Jan. 22, 2020, noon 46.8 ppb (43) 11.5 ppb (11) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 43.0
 
Jan. 22, 2020, 11 a.m. 36.8 ppb (34) 7.6 ppb (7) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 34.0
 
Jan. 22, 2020, 10 a.m. 22.8 ppb (21) 3.1 ppb (3) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 22, 2020, 9 a.m. 17.5 ppb (16) 1.4 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 22, 2020, 8 a.m. 21.0 ppb (19) 1.4 ppb (1) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 7 a.m. 18.9 ppb (18) 1.1 ppb (1) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 6 a.m. 14.3 ppb (13) 1.1 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2020, 5 a.m. 21.2 ppb (20) 1.5 ppb (1) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 4 a.m. 14.3 ppb (13) 0.7 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 3 a.m. 22.8 ppb (21) 1.7 ppb (2) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 21.0
 
Jan. 22, 2020, 2 a.m. 24.1 ppb (22) 2.0 ppb (2) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 22.0
 
Jan. 22, 2020, 1 a.m. 15.4 ppb (14) 1.4 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 22, 2020, midnight 15.9 ppb (15) 1.5 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 21, 2020, 11 p.m. 19.7 ppb (18) 3.2 ppb (3) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 18.0
 
Jan. 21, 2020, 10 p.m. 19.0 ppb (18) 4.7 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 18.0
 
Jan. 21, 2020, 9 p.m. 12.8 ppb (12) 3.5 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 21, 2020, 8 p.m. 11.6 ppb (11) 4.1 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 11.0
 
Jan. 21, 2020, 7 p.m. 9.6 ppb (9) 3.4 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 9.0
 
Jan. 21, 2020, 6 p.m. 9.6 ppb (9) 3.4 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2020, 5 p.m. 10.3 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 10.0
 
Jan. 21, 2020, 4 p.m. 10.3 ppb (10) 4.1 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 10.0
 
Jan. 21, 2020, 3 p.m. 11.7 ppb (11) 4.4 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 21, 2020, 2 p.m. 17.0 ppb (16) 6.6 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2020, 1 p.m. 30.2 ppb (28) 9.5 ppb (9) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 28.0
 
Jan. 21, 2020, noon 25.5 ppb (24) 4.7 ppb (4) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 24.0
 
Jan. 21, 2020, 11 a.m. 16.1 ppb (15) 1.8 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 15.0
 
Jan. 21, 2020, 10 a.m. 16.0 ppb (15) 2.4 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 15.0
 
Jan. 21, 2020, 9 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 12.0
 
Jan. 21, 2020, 8 a.m. 16.9 ppb (16) 1.3 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 16.0
 
Jan. 21, 2020, 7 a.m. 15.2 ppb (14) 0.5 ppb (0) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 21, 2020, 6 a.m. 27.4 ppb (25) 2.0 ppb (2) N/A 25.0 ppb (23) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2020, 5 a.m. 23.9 ppb (22) 1.3 ppb (1) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 21, 2020, 4 a.m. 27.7 ppb (26) 1.7 ppb (2) N/A 26.0 ppb (24) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 26.0
 
Jan. 21, 2020, 3 a.m. 17.5 ppb (16) 1.1 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 16.0
 
Jan. 21, 2020, 2 a.m. 26.9 ppb (25) 2.0 ppb (2) N/A 25.0 ppb (23) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 25.0
 
Jan. 21, 2020, 1 a.m. 21.0 ppb (19) 1.6 ppb (1) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 19.0
 
Jan. 21, 2020, midnight 13.4 ppb (12) 1.1 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 11 p.m. 13.4 ppb (12) 1.9 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2020, 10 p.m. 11.7 ppb (11) 1.8 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 11.0
 
Jan. 20, 2020, 9 p.m. 9.5 ppb (9) 2.7 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 9.0
 
Jan. 20, 2020, 8 p.m. 7.9 ppb (7) 2.4 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 7.0
 
Jan. 20, 2020, 7 p.m. 8.1 ppb (8) 2.8 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 20, 2020, 6 p.m. 7.9 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 20, 2020, 5 p.m. 8.1 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 8.0
 
Jan. 20, 2020, 4 p.m. 9.4 ppb (9) 3.7 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 9.0
 
Jan. 20, 2020, 3 p.m. 10.3 ppb (10) 4.2 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 10.0
 
Jan. 20, 2020, 2 p.m. 10.0 ppb (9) 3.8 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 1 p.m. 13.1 ppb (12) 4.3 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2020, noon 12.0 ppb (11) 1.8 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2020, 11 a.m. 13.1 ppb (12) 1.7 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 20, 2020, 10 a.m. 8.7 ppb (8) 0.7 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2020, 9 a.m. 7.9 ppb (7) 0.7 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 20, 2020, 8 a.m. 6.0 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2020, 7 a.m. 6.1 ppb (6) 0.4 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2020, 6 a.m. 7.0 ppb (6) 0.4 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 20, 2020, 5 a.m. 7.4 ppb (7) 0.5 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2020, 4 a.m. 7.2 ppb (7) 0.5 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 3 a.m. 7.1 ppb (7) 0.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 2 a.m. 6.3 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 1 a.m. 6.8 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, midnight 7.0 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 11 p.m. 6.6 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 10 p.m. 6.0 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 19, 2020, 9 p.m. 5.5 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 19, 2020, 8 p.m. 4.1 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 7 p.m. 5.4 ppb (5) 1.8 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 19, 2020, 6 p.m. 5.1 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 5.0
 
Jan. 19, 2020, 5 p.m. 5.0 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 5.0
 
Jan. 19, 2020, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
Jan. 19, 2020, 3 p.m. 3.8 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 19, 2020, 2 p.m. 3.8 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 19, 2020, 1 p.m. 4.2 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 4.0
 
Jan. 19, 2020, noon 7.1 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 7.0
 
Jan. 19, 2020, 11 a.m. 13.8 ppb (13) 1.4 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 13.0
 
Jan. 19, 2020, 10 a.m. 20.9 ppb (19) 3.1 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 19.0
 
Jan. 19, 2020, 9 a.m. 16.3 ppb (15) 1.2 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 15.0
 
Jan. 19, 2020, 8 a.m. 13.5 ppb (12) 0.9 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2020, 7 a.m. 11.8 ppb (11) 0.8 ppb (1) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 6 a.m. 9.0 ppb (8) 0.8 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 5 a.m. 10.5 ppb (10) 1.4 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2020, 4 a.m. 12.4 ppb (11) 1.8 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 3 a.m. 13.4 ppb (12) 1.7 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 2 a.m. 14.6 ppb (14) 2.5 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 1 a.m. 14.9 ppb (14) 2.9 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2020, midnight 13.4 ppb (12) 2.1 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2020, 11 p.m. 10.9 ppb (10) 1.2 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 10 p.m. 13.8 ppb (13) 2.8 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 13.0
 
Jan. 18, 2020, 9 p.m. 20.3 ppb (19) 3.2 ppb (3) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2020, 8 p.m. 19.2 ppb (18) 3.6 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 18.0
 
Jan. 18, 2020, 7 p.m. 15.1 ppb (14) 4.3 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2020, 6 p.m. 11.2 ppb (10) 2.7 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2020, 5 p.m. 12.6 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 12.0
 
Jan. 18, 2020, 4 p.m. 9.3 ppb (9) 2.9 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 18, 2020, 3 p.m. 10.0 ppb (9) 3.2 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2020, 2 p.m. 14.6 ppb (14) 3.5 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 14.0
 
Jan. 18, 2020, 1 p.m. 11.8 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 18, 2020, noon 14.7 ppb (14) 2.3 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 11 a.m. 23.8 ppb (22) 3.4 ppb (3) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 10 a.m. 15.0 ppb (14) 1.9 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2020, 9 a.m. 13.7 ppb (13) 1.4 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 13.0
 
Jan. 18, 2020, 8 a.m. 11.3 ppb (10) 0.9 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 10.0
 
Jan. 18, 2020, 7 a.m. 12.7 ppb (12) 1.9 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 12.0
 
Jan. 18, 2020, 6 a.m. 12.4 ppb (11) 2.2 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2020, 5 a.m. 15.5 ppb (14) 2.8 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 4 a.m. 26.6 ppb (25) 4.6 ppb (4) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 3 a.m. 29.3 ppb (27) 5.9 ppb (5) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 27.0
 
Jan. 18, 2020, 2 a.m. 36.6 ppb (34) 8.8 ppb (8) N/A 28.0 ppb (26) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 34.0
 
Jan. 18, 2020, 1 a.m. 22.1 ppb (20) 3.6 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 20.0
 
Jan. 18, 2020, midnight 21.8 ppb (20) 4.1 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2020, 11 p.m. 18.6 ppb (17) 4.1 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, 10 p.m. 17.2 ppb (16) 4.8 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 16.0
 
Jan. 17, 2020, 9 p.m. 13.6 ppb (13) 4.9 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 13.0
 
Jan. 17, 2020, 8 p.m. 12.0 ppb (11) 4.7 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 11.0
 
Jan. 17, 2020, 7 p.m. 11.9 ppb (11) 5.3 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 11.0
 
Jan. 17, 2020, 6 p.m. 8.9 ppb (8) 4.1 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, 5 p.m. 7.3 ppb (7) 3.2 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 17, 2020, 4 p.m. 9.5 ppb (9) 4.5 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, 3 p.m. 8.4 ppb (8) 3.6 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 17, 2020, 2 p.m. 10.7 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 10.0
 
Jan. 17, 2020, 1 p.m. 11.1 ppb (10) 3.7 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 10.0
 
Jan. 17, 2020, noon 11.0 ppb (10) 3.1 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 10.0
 
Jan. 17, 2020, 11 a.m. 8.8 ppb (8) 1.8 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 8.0
 
Jan. 17, 2020, 10 a.m. 6.3 ppb (6) 1.4 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 6.0
 
Jan. 17, 2020, 9 a.m. 4.1 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 4.0
 
Jan. 17, 2020, 7 a.m. 3.0 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 3.0
 
Jan. 17, 2020, 6 a.m. 4.1 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
Jan. 17, 2020, 5 a.m. 3.9 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
Jan. 17, 2020, 4 a.m. 4.4 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 4.0
 
Jan. 17, 2020, 3 a.m. 4.1 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 4.0
 
Jan. 17, 2020, 2 a.m. 4.8 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
Jan. 17, 2020, 1 a.m. 5.8 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0