AQSQID: 245100040

Site Name: Oldtown

Location: Baltimore (Old Town), MD

Reporting: True, Located: True

Current AQI: 25.0

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. 4, 2020, 11 a.m. 52.0 ppb (48) 31.5 ppb (29) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 48.0
 
Jan. 4, 2020, 10 a.m. 36.3 ppb (34) 16.8 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 34.0
 
Jan. 4, 2020, 9 a.m. 35.9 ppb (33) 15.7 ppb (15) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 33.0
 
Jan. 4, 2020, 8 a.m. 35.0 ppb (32) 14.2 ppb (13) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 32.0
 
Jan. 4, 2020, 7 a.m. 30.5 ppb (28) 10.0 ppb (9) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 4, 2020, 6 a.m. 38.6 ppb (36) 17.0 ppb (16) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 36.0
 
Jan. 4, 2020, 5 a.m. 23.5 ppb (22) 7.2 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Jan. 4, 2020, 4 a.m. 20.8 ppb (19) 3.0 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 4, 2020, 3 a.m. 22.7 ppb (21) 4.5 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 4, 2020, 2 a.m. 37.2 ppb (34) 14.3 ppb (13) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 4, 2020, 1 a.m. 49.9 ppb (46) 22.8 ppb (21) N/A 27.0 ppb (25) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 46.0
 
Jan. 4, 2020, midnight 45.7 ppb (42) 18.3 ppb (17) N/A 27.0 ppb (25) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 3, 2020, 11 p.m. 76.8 ppb (74) 45.6 ppb (42) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 74.0
 
Jan. 3, 2020, 10 p.m. 65.5 ppb (62) 33.7 ppb (31) N/A 32.0 ppb (30) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 62.0
 
Jan. 3, 2020, 9 p.m. 61.6 ppb (58) 31.6 ppb (29) N/A 30.0 ppb (28) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 58.0
 
Jan. 3, 2020, 8 p.m. 38.0 ppb (35) 13.3 ppb (12) N/A 25.0 ppb (23) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 35.0
 
Jan. 3, 2020, 7 p.m. 28.8 ppb (27) 10.5 ppb (10) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 27.0
 
Jan. 3, 2020, 6 p.m. 20.9 ppb (19) 5.8 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 3, 2020, 5 p.m. 29.0 ppb (27) 11.0 ppb (10) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 27.0
 
Jan. 3, 2020, 4 p.m. 34.0 ppb (31) 12.3 ppb (11) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 31.0
 
Jan. 3, 2020, 3 p.m. 38.9 ppb (36) 15.6 ppb (14) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 36.0
 
Jan. 3, 2020, 2 p.m. 44.5 ppb (41) 18.1 ppb (17) N/A 26.0 ppb (24) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 41.0
 
Jan. 3, 2020, 1 p.m. 54.6 ppb (51) 23.3 ppb (22) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 51.0
 
Jan. 3, 2020, noon 38.3 ppb (35) 10.8 ppb (10) N/A 27.0 ppb (25) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 35.0
 
Jan. 3, 2020, 11 a.m. 23.5 ppb (22) 4.0 ppb (4) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 3, 2020, 10 a.m. 17.6 ppb (16) 2.3 ppb (2) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 16.0
 
Jan. 3, 2020, 9 a.m. 13.4 ppb (12) 1.2 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 12.0
 
Jan. 3, 2020, 8 a.m. 17.5 ppb (16) 1.3 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 3, 2020, 7 a.m. 21.4 ppb (20) 1.7 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 3, 2020, 6 a.m. 34.4 ppb (32) 5.0 ppb (5) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 32.0
 
Jan. 3, 2020, 5 a.m. 54.0 ppb (50) 19.1 ppb (18) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 50.0
 
Jan. 3, 2020, 4 a.m. 56.2 ppb (52) 20.1 ppb (19) N/A 36.0 ppb (33) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 52.0
 
Jan. 3, 2020, 3 a.m. 57.5 ppb (54) 21.8 ppb (20) N/A 36.0 ppb (33) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 54.0
 
Jan. 3, 2020, 2 a.m. 65.0 ppb (62) 27.9 ppb (26) N/A 37.0 ppb (34) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 62.0
 
Jan. 3, 2020, 1 a.m. 58.1 ppb (54) 20.6 ppb (19) N/A 38.0 ppb (35) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 54.0
 
Jan. 3, 2020, midnight 64.4 ppb (61) 26.0 ppb (24) N/A 38.0 ppb (35) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 61.0
 
Jan. 2, 2020, 11 p.m. 79.0 ppb (77) 39.2 ppb (36) N/A 40.0 ppb (37) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 77.0
 
Jan. 2, 2020, 10 p.m. 91.7 ppb (90) 51.5 ppb (48) N/A 40.0 ppb (37) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 90.0
 
Jan. 2, 2020, 9 p.m. 67.9 ppb (65) 31.7 ppb (29) N/A 36.0 ppb (33) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 65.0
 
Jan. 2, 2020, 8 p.m. 52.5 ppb (49) 22.5 ppb (21) N/A 30.0 ppb (28) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 49.0
 
Jan. 2, 2020, 7 p.m. 53.1 ppb (49) 23.3 ppb (22) N/A 30.0 ppb (28) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 49.0
 
Jan. 2, 2020, 6 p.m. 53.2 ppb (49) 25.7 ppb (24) N/A 27.0 ppb (25) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 49.0
 
Jan. 2, 2020, 5 p.m. 67.6 ppb (64) 36.5 ppb (34) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 64.0
 
Jan. 2, 2020, 4 p.m. 126.9 ppb (105) 82.2 ppb (80) N/A 45.0 ppb (42) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 105.0
 
Jan. 2, 2020, 3 p.m. 142.6 ppb (108) 98.4 ppb (97) N/A 44.0 ppb (41) N/A N/A N/A N/A N/A 24.0 μg/m3 (76) 108.0
 
Jan. 2, 2020, 2 p.m. 193.3 ppb (118) 148.5 ppb (109) N/A 45.0 ppb (42) N/A N/A N/A N/A N/A 18.0 μg/m3 (63) 118.0
 
Jan. 2, 2020, 1 p.m. 148.7 ppb (109) 113.9 ppb (102) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 109.0
 
Jan. 2, 2020, noon 132.1 ppb (106) 98.8 ppb (98) N/A 33.0 ppb (31) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 106.0
 
Jan. 2, 2020, 11 a.m. 118.0 ppb (103) 85.6 ppb (84) N/A 32.0 ppb (30) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 103.0
 
Jan. 2, 2020, 10 a.m. 124.0 ppb (104) 91.2 ppb (90) N/A 33.0 ppb (31) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 104.0
 
Jan. 2, 2020, 9 a.m. 134.2 ppb (106) 97.8 ppb (97) N/A 36.0 ppb (33) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 106.0
 
Jan. 2, 2020, 8 a.m. 117.6 ppb (103) 83.2 ppb (81) N/A 34.0 ppb (31) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 103.0
 
Jan. 2, 2020, 7 a.m. 114.5 ppb (103) 79.6 ppb (77) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 103.0
 
Jan. 2, 2020, 6 a.m. 87.4 ppb (86) 52.7 ppb (49) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 86.0
 
Jan. 2, 2020, 5 a.m. 80.0 ppb (78) 44.3 ppb (41) N/A 36.0 ppb (33) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 78.0
 
Jan. 2, 2020, 4 a.m. 112.5 ppb (102) 73.6 ppb (71) N/A 39.0 ppb (36) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 102.0
 
Jan. 2, 2020, 3 a.m. 69.9 ppb (67) 32.6 ppb (30) N/A 37.0 ppb (34) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 67.0
 
Jan. 2, 2020, 2 a.m. 45.8 ppb (42) 13.7 ppb (13) N/A 32.0 ppb (30) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 2, 2020, 1 a.m. 21.3 ppb (20) 1.8 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 2, 2020, midnight 17.3 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. 1, 2020, 11 p.m. 14.2 ppb (13) 1.2 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 13.0
 
Jan. 1, 2020, 10 p.m. 9.9 ppb (9) 1.3 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 9.0
 
Jan. 1, 2020, 9 p.m. 7.0 ppb (6) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 1, 2020, 8 p.m. 4.2 ppb (4) 1.0 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. 1, 2020, 7 p.m. 3.7 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 3.0
 
Jan. 1, 2020, 6 p.m. 3.9 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 4.0
 
Jan. 1, 2020, 5 p.m. 3.8 ppb (4) 1.3 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. 1, 2020, 4 p.m. 3.9 ppb (4) 1.2 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. 1, 2020, 3 p.m. 4.3 ppb (4) 1.6 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. 1, 2020, 2 p.m. 5.1 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 1, 2020, 1 p.m. 7.9 ppb (7) 0.9 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. 1, 2020, noon 9.0 ppb (8) 1.6 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. 1, 2020, 11 a.m. 13.9 ppb (13) 5.1 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 13.0
 
Jan. 1, 2020, 10 a.m. 7.4 ppb (7) 1.4 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. 1, 2020, 9 a.m. 6.9 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 1, 2020, 8 a.m. 5.7 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 1, 2020, 7 a.m. 4.1 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 1, 2020, 6 a.m. 4.6 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 4.0
 
Jan. 1, 2020, 5 a.m. 6.7 ppb (6) 2.2 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 6.0
 
Jan. 1, 2020, 4 a.m. 6.5 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 6.0
 
Jan. 1, 2020, 3 a.m. 5.2 ppb (5) 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. 1, 2020, 2 a.m. 4.4 ppb (4) 0.7 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. 1, 2020, 1 a.m. 4.6 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 1, 2020, midnight 6.1 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 6.0
 
Dec. 31, 2019, 11 p.m. 13.3 ppb (12) 1.6 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
 
Dec. 31, 2019, 10 p.m. 14.1 ppb (13) 1.8 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 13.0
 
Dec. 31, 2019, 9 p.m. 10.0 ppb (9) 1.4 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 9.0
 
Dec. 31, 2019, 8 p.m. 12.2 ppb (11) 3.4 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 11.0
 
Dec. 31, 2019, 7 p.m. 14.8 ppb (14) 5.3 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 31, 2019, 6 p.m. 14.4 ppb (13) 5.1 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 13.0
 
Dec. 31, 2019, 5 p.m. 12.4 ppb (11) 4.4 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 11.0
 
Dec. 31, 2019, 4 p.m. 18.7 ppb (17) 6.3 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 17.0
 
Dec. 31, 2019, 3 p.m. 23.4 ppb (22) 9.1 ppb (8) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Dec. 31, 2019, 2 p.m. 26.1 ppb (24) 9.5 ppb (9) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Dec. 31, 2019, 1 p.m. 23.5 ppb (22) 6.9 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Dec. 31, 2019, noon 24.0 ppb (22) 6.0 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Dec. 31, 2019, 11 a.m. 21.0 ppb (19) 7.6 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Dec. 31, 2019, 10 a.m. 9.9 ppb (9) 1.9 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 9.0
 
Dec. 31, 2019, 9 a.m. 7.8 ppb (7) 0.7 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Dec. 31, 2019, 8 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 1.0 μg/m3 (4) 7.0
 
Dec. 31, 2019, 7 a.m. 6.0 ppb (6) 0.4 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Dec. 31, 2019, 6 a.m. 6.0 ppb (6) 0.4 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
 
Dec. 31, 2019, 5 a.m. 6.7 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Dec. 31, 2019, 4 a.m. 9.1 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
 
Dec. 31, 2019, 3 a.m. 10.2 ppb (9) 1.9 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Dec. 31, 2019, 2 a.m. 10.0 ppb (9) 1.8 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Dec. 31, 2019, 1 a.m. 11.7 ppb (11) 2.1 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 11.0
 
Dec. 31, 2019, midnight 14.1 ppb (13) 2.5 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 13.0
 
Dec. 30, 2019, 11 p.m. 15.3 ppb (14) 3.4 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 14.0
 
Dec. 30, 2019, 10 p.m. 17.5 ppb (16) 4.6 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 16.0
 
Dec. 30, 2019, 9 p.m. 22.4 ppb (21) 8.4 ppb (8) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 21.0
 
Dec. 30, 2019, 8 p.m. 21.8 ppb (20) 9.7 ppb (9) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 20.0
 
Dec. 30, 2019, 7 p.m. 24.9 ppb (23) 10.3 ppb (10) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 23.0
 
Dec. 30, 2019, 6 p.m. 31.2 ppb (29) 13.8 ppb (13) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 29.0
 
Dec. 30, 2019, 5 p.m. 26.8 ppb (25) 8.8 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 25.0
 
Dec. 30, 2019, 4 p.m. 33.7 ppb (31) 12.5 ppb (12) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 31.0
 
Dec. 30, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Dec. 30, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
Dec. 30, 2019, 1 p.m. 68.9 ppb (66) 38.0 ppb (35) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A N/A 66.0
 
Dec. 30, 2019, noon 54.1 ppb (50) 25.0 ppb (23) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 50.0
 
Dec. 30, 2019, 11 a.m. 41.6 ppb (39) 15.0 ppb (14) N/A 27.0 ppb (25) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 39.0
 
Dec. 30, 2019, 10 a.m. 30.0 ppb (28) 7.3 ppb (7) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 28.0
 
Dec. 30, 2019, 9 a.m. 20.6 ppb (19) 2.0 ppb (2) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 19.0
 
Dec. 30, 2019, 8 a.m. 16.5 ppb (15) 1.1 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 15.0
 
Dec. 30, 2019, 7 a.m. 11.6 ppb (11) 0.8 ppb (1) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 11.0
 
Dec. 30, 2019, 6 a.m. 11.5 ppb (11) 1.6 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 11.0
 
Dec. 30, 2019, 5 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 1.0 μg/m3 (4) 12.0
 
Dec. 30, 2019, 4 a.m. 14.5 ppb (13) 2.2 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 13.0
 
Dec. 30, 2019, 3 a.m. 15.5 ppb (14) 1.9 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 14.0
 
Dec. 30, 2019, 2 a.m. 17.1 ppb (16) 2.4 ppb (2) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 30, 2019, 1 a.m. 18.3 ppb (17) 3.1 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 30, 2019, midnight 17.9 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 29, 2019, 11 p.m. 19.3 ppb (18) 4.3 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
 
Dec. 29, 2019, 10 p.m. 20.0 ppb (19) 3.7 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Dec. 29, 2019, 9 p.m. 22.3 ppb (21) 5.7 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Dec. 29, 2019, 8 p.m. 23.8 ppb (22) 7.6 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Dec. 29, 2019, 7 p.m. 23.1 ppb (21) 6.6 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 61.0
 
Dec. 29, 2019, 6 p.m. 21.5 ppb (20) 5.4 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 56.0
 
Dec. 29, 2019, 5 p.m. 23.4 ppb (22) 6.9 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 61.0
 
Dec. 29, 2019, 4 p.m. 21.8 ppb (20) 5.7 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 59.0
 
Dec. 29, 2019, 3 p.m. 23.3 ppb (22) 6.3 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 23.0 μg/m3 (73) 73.0
 
Dec. 29, 2019, 2 p.m. 22.4 ppb (21) 6.2 ppb (6) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 23.0 μg/m3 (73) 73.0
 
Dec. 29, 2019, 1 p.m. 23.6 ppb (22) 5.8 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 24.0 μg/m3 (76) 76.0
 
Dec. 29, 2019, noon 23.5 ppb (22) 4.3 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 25.0 μg/m3 (78) 78.0
 
Dec. 29, 2019, 11 a.m. 19.7 ppb (18) 2.5 ppb (2) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
Dec. 29, 2019, 10 a.m. 22.5 ppb (21) 2.4 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
Dec. 29, 2019, 9 a.m. 20.4 ppb (19) 2.2 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 22.0 μg/m3 (71) 71.0
 
Dec. 29, 2019, 8 a.m. 23.2 ppb (21) 4.0 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
Dec. 29, 2019, 7 a.m. 46.9 ppb (43) 20.0 ppb (19) N/A 27.0 ppb (25) N/A N/A N/A N/A N/A 24.0 μg/m3 (76) 76.0
 
Dec. 29, 2019, 6 a.m. 27.5 ppb (25) 3.4 ppb (3) N/A 24.0 ppb (22) N/A N/A N/A N/A N/A 21.0 μg/m3 (69) 69.0
 
Dec. 29, 2019, 5 a.m. 39.2 ppb (36) 10.9 ppb (10) N/A 28.0 ppb (26) N/A N/A N/A N/A N/A 26.0 μg/m3 (80) 80.0
 
Dec. 29, 2019, 4 a.m. 37.9 ppb (35) 9.3 ppb (9) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A 25.0 μg/m3 (78) 78.0
 
Dec. 29, 2019, 3 a.m. 54.9 ppb (51) 23.4 ppb (22) N/A 32.0 ppb (30) N/A N/A N/A N/A N/A 23.0 μg/m3 (73) 73.0
 
Dec. 29, 2019, 2 a.m. 34.3 ppb (32) 5.6 ppb (5) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
Dec. 29, 2019, 1 a.m. 43.8 ppb (41) 12.4 ppb (11) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
Dec. 29, 2019, midnight 68.9 ppb (66) 34.1 ppb (32) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
Dec. 28, 2019, 11 p.m. 82.9 ppb (81) 46.6 ppb (43) N/A 36.0 ppb (33) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 81.0
 
Dec. 28, 2019, 10 p.m. 54.2 ppb (50) 16.6 ppb (15) N/A 38.0 ppb (35) N/A N/A N/A N/A N/A 21.0 μg/m3 (69) 69.0
 
Dec. 28, 2019, 9 p.m. 67.2 ppb (64) 31.1 ppb (29) N/A 36.0 ppb (33) N/A N/A N/A N/A N/A 14.0 μg/m3 (54) 64.0
 
Dec. 28, 2019, 8 p.m. 44.4 ppb (41) 22.0 ppb (20) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Dec. 28, 2019, 7 p.m. 8.6 ppb (8) 1.8 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Dec. 28, 2019, 6 p.m. 8.3 ppb (8) 1.8 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Dec. 28, 2019, 5 p.m. 7.0 ppb (6) 1.5 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
 
Dec. 28, 2019, 4 p.m. 7.6 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Dec. 28, 2019, 3 p.m. 72.5 ppb (70) 44.6 ppb (41) N/A 28.0 ppb (26) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 70.0
 
Dec. 28, 2019, 2 p.m. 163.7 ppb (112) 122.8 ppb (104) N/A 41.0 ppb (38) N/A N/A N/A N/A N/A 23.0 μg/m3 (73) 112.0
 
Dec. 28, 2019, 1 p.m. 153.9 ppb (110) 125.3 ppb (105) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 110.0
 
Dec. 28, 2019, noon 106.5 ppb (101) 84.1 ppb (82) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 101.0