AQSQID: 245100040

Site Name: Oldtown

Location: Baltimore, MD

Reporting: True, Located: True

Current AQI: 25.0

Baltimore MD, US: 39.2981, -76.604698

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Sept. 19, 2019, 7 p.m. 6.8 ppb (6) 2.5 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 6 p.m. 8.5 ppb (8) 2.9 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2019, 5 p.m. 8.4 ppb (8) 3.2 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2019, 4 p.m. 9.1 ppb (8) 3.5 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 3 p.m. 8.1 ppb (8) 3.6 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 19, 2019, 2 p.m. 10.6 ppb (10) 5.1 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2019, 1 p.m. 17.7 ppb (16) 8.7 ppb (8) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2019, noon 27.7 ppb (26) 13.2 ppb (12) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 19, 2019, 11 a.m. 29.3 ppb (27) 11.6 ppb (11) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 19, 2019, 10 a.m. 25.4 ppb (24) 10.5 ppb (10) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 19, 2019, 9 a.m. 11.6 ppb (11) 2.9 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2019, 8 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2019, 7 a.m. 6.2 ppb (6) 0.3 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
 
Sept. 19, 2019, 6 a.m. 5.5 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 19, 2019, 5 a.m. 5.6 ppb (5) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 4 a.m. 3.5 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2019, 3 a.m. 4.1 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2019, 2 a.m. 6.4 ppb (6) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 1 a.m. 12.1 ppb (11) 2.3 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 19, 2019, midnight 16.7 ppb (15) 3.0 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2019, 11 p.m. 14.2 ppb (13) 3.2 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 10 p.m. 12.3 ppb (11) 2.7 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 18, 2019, 9 p.m. 10.8 ppb (10) 2.9 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2019, 8 p.m. 13.0 ppb (12) 3.8 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2019, 7 p.m. 10.0 ppb (9) 3.5 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2019, 6 p.m. 10.4 ppb (10) 3.2 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2019, 5 p.m. 8.9 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 4 p.m. 6.8 ppb (6) 2.5 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 18, 2019, 3 p.m. 10.6 ppb (10) 4.5 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 18, 2019, 2 p.m. 10.5 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2019, 1 p.m. 17.0 ppb (16) 7.5 ppb (7) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 18, 2019, noon 28.4 ppb (26) 12.2 ppb (11) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 11 a.m. 27.8 ppb (26) 9.0 ppb (8) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2019, 10 a.m. 27.7 ppb (26) 9.3 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2019, 9 a.m. 21.1 ppb (20) 4.0 ppb (4) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2019, 8 a.m. 13.9 ppb (13) 1.3 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 7 a.m. 9.5 ppb (9) 0.6 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2019, 6 a.m. 15.6 ppb (14) 1.0 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2019, 5 a.m. 16.8 ppb (16) 1.3 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 14.0 μg/m3 (54) 54.0
 
Sept. 18, 2019, 4 a.m. 12.6 ppb (12) 0.8 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2019, 3 a.m. 20.2 ppb (19) 2.0 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 2 a.m. 22.4 ppb (21) 3.2 ppb (3) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 1 a.m. 23.3 ppb (22) 4.1 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2019, midnight 17.4 ppb (16) 1.5 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
 
Sept. 17, 2019, 11 p.m. 17.7 ppb (16) 1.1 ppb (1) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2019, 10 p.m. 14.6 ppb (14) 1.9 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2019, 9 p.m. 13.5 ppb (12) 1.9 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
 
Sept. 17, 2019, 8 p.m. 11.2 ppb (10) 2.1 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2019, 7 p.m. 14.2 ppb (13) 3.2 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2019, 6 p.m. 8.3 ppb (8) 2.2 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2019, 5 p.m. 6.8 ppb (6) 1.9 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2019, 4 p.m. 10.6 ppb (10) 3.7 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
 
Sept. 17, 2019, 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 7.0 μg/m3 (29) 29.0
 
Sept. 17, 2019, 2 p.m. 12.6 ppb (12) 5.4 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2019, 1 p.m. 16.4 ppb (15) 6.5 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 17, 2019, noon 21.2 ppb (20) 9.1 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
Sept. 17, 2019, 11 a.m. 19.6 ppb (18) 6.9 ppb (6) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2019, 10 a.m. 14.1 ppb (13) 3.9 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2019, 9 a.m. 9.0 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2019, 8 a.m. 6.9 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 17, 2019, 7 a.m. 5.6 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 17, 2019, 6 a.m. 6.3 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2019, 5 a.m. 5.5 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 17, 2019, 4 a.m. 8.5 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2019, 3 a.m. 10.8 ppb (10) 0.8 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
Sept. 17, 2019, 2 a.m. 14.0 ppb (13) 1.5 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2019, 1 a.m. 13.6 ppb (13) 1.7 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2019, midnight 13.3 ppb (12) 1.1 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 16, 2019, 11 p.m. 15.4 ppb (14) 1.8 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 16, 2019, 10 p.m. 15.9 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 16, 2019, 9 p.m. 16.9 ppb (16) 1.5 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
Sept. 16, 2019, 8 p.m. 19.8 ppb (18) 2.2 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 16, 2019, 7 p.m. 13.5 ppb (12) 2.2 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
Sept. 16, 2019, 6 p.m. 13.4 ppb (12) 3.1 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
Sept. 16, 2019, 5 p.m. 16.6 ppb (15) 3.2 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 16, 2019, 4 p.m. 21.4 ppb (20) 4.4 ppb (4) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 16, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 16, 2019, noon 54.1 ppb (50) 24.8 ppb (23) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A N/A 50.0
 
Sept. 16, 2019, 11 a.m. 43.3 ppb (40) 18.7 ppb (17) N/A 25.0 ppb (23) N/A N/A N/A N/A N/A N/A 40.0
 
Sept. 16, 2019, 10 a.m. 40.9 ppb (38) 14.6 ppb (14) N/A 26.0 ppb (24) N/A N/A N/A N/A N/A N/A 38.0
 
Sept. 16, 2019, 9 a.m. 19.0 ppb (18) 1.9 ppb (2) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A N/A 18.0
 
Sept. 16, 2019, 8 a.m. 56.1 ppb (52) 28.6 ppb (26) N/A 28.0 ppb (26) N/A N/A N/A N/A N/A N/A 52.0
 
Sept. 16, 2019, 7 a.m. 65.9 ppb (63) 36.4 ppb (34) N/A 29.0 ppb (27) N/A N/A N/A N/A N/A N/A 63.0
 
Sept. 16, 2019, 6 a.m. 65.9 ppb (63) 35.4 ppb (33) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A N/A 63.0
 
Sept. 16, 2019, 5 a.m. 85.8 ppb (84) 52.2 ppb (48) N/A 34.0 ppb (31) N/A N/A N/A N/A N/A N/A 84.0
 
Sept. 16, 2019, 4 a.m. 61.5 ppb (58) 27.5 ppb (25) N/A 34.0 ppb (31) N/A N/A N/A N/A N/A N/A 58.0
 
Sept. 16, 2019, 3 a.m. 61.6 ppb (58) 23.0 ppb (21) N/A 39.0 ppb (36) N/A N/A N/A N/A N/A N/A 58.0
 
Sept. 16, 2019, 2 a.m. 45.0 ppb (42) 9.7 ppb (9) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A N/A 42.0
 
Sept. 16, 2019, 1 a.m. 20.8 ppb (19) 1.0 ppb (1) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A N/A 19.0
 
Sept. 16, 2019, midnight 14.7 ppb (14) 0.6 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A N/A 14.0
 
Sept. 15, 2019, 11 p.m. 8.1 ppb (8) 0.8 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 15, 2019, 10 p.m. 4.7 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 4.0
 
Sept. 15, 2019, 9 p.m. 4.3 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 4.0
 
Sept. 15, 2019, 8 p.m. 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 2.0
 
Sept. 15, 2019, 7 p.m. 2.5 ppb (2) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 2.0
 
Sept. 15, 2019, 6 p.m. 2.8 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 3.0
 
Sept. 15, 2019, 5 p.m. 2.3 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 2.0
 
Sept. 15, 2019, 4 p.m. 2.6 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 2.0
 
Sept. 15, 2019, 3 p.m. 3.3 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 3.0
 
Sept. 15, 2019, 2 p.m. 4.8 ppb (4) 1.7 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 4.0
 
Sept. 15, 2019, 1 p.m. 6.4 ppb (6) 2.7 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 6.0
 
Sept. 15, 2019, noon 6.1 ppb (6) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 6.0
 
Sept. 15, 2019, 11 a.m. 7.7 ppb (7) 1.2 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 7.0
 
Sept. 15, 2019, 10 a.m. 6.7 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 6.0
 
Sept. 15, 2019, 9 a.m. 15.3 ppb (14) 2.4 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A N/A 14.0
 
Sept. 15, 2019, 8 a.m. 5.7 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 6.0
 
Sept. 15, 2019, 7 a.m. 11.7 ppb (11) 1.3 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A N/A 11.0
 
Sept. 15, 2019, 6 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 N/A 8.0
 
Sept. 15, 2019, 5 a.m. 8.5 ppb (8) 1.8 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 15, 2019, 4 a.m. 10.4 ppb (10) 2.5 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A N/A 10.0
 
Sept. 15, 2019, 3 a.m. 9.5 ppb (9) 1.9 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A N/A 9.0
 
Sept. 15, 2019, 2 a.m. 10.1 ppb (9) 2.1 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A N/A 9.0
 
Sept. 15, 2019, 1 a.m. 8.4 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 15, 2019, midnight 8.6 ppb (8) 2.3 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 14, 2019, 11 p.m. 11.9 ppb (11) 2.9 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A N/A 11.0
 
Sept. 14, 2019, 10 p.m. 7.5 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 7.0
 
Sept. 14, 2019, 9 p.m. 6.6 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 6.0
 
Sept. 14, 2019, 8 p.m. 5.8 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 5.0
 
Sept. 14, 2019, 7 p.m. 7.3 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 7.0
 
Sept. 14, 2019, 6 p.m. 7.2 ppb (7) 2.3 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 7.0
 
Sept. 14, 2019, 5 p.m. 5.8 ppb (5) 1.9 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 5.0
 
Sept. 14, 2019, 4 p.m. 10.3 ppb (10) 3.6 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 10.0
 
Sept. 14, 2019, 3 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 N/A 9.0
 
Sept. 14, 2019, 2 p.m. 17.4 ppb (16) 6.6 ppb (6) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A N/A 16.0
 
Sept. 14, 2019, 1 p.m. 21.1 ppb (20) 6.3 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A N/A 20.0
 
Sept. 14, 2019, noon 19.6 ppb (18) 5.7 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A N/A 18.0
 
Sept. 14, 2019, 11 a.m. 15.3 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A N/A 14.0
 
Sept. 14, 2019, 10 a.m. 12.9 ppb (12) 1.9 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A N/A 12.0
 
Sept. 14, 2019, 9 a.m. 10.9 ppb (10) 1.3 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A N/A 10.0
 
Sept. 14, 2019, 8 a.m. 8.3 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 14, 2019, 7 a.m. 5.3 ppb (5) 1.1 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 5.0
 
Sept. 14, 2019, 6 a.m. 5.6 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 5.0
 
Sept. 14, 2019, 5 a.m. 4.8 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 4.0
 
Sept. 14, 2019, 4 a.m. 4.0 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 4.0
 
Sept. 14, 2019, 3 a.m. 4.9 ppb (5) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 14, 2019, 2 a.m. 5.7 ppb (5) 2.2 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 14, 2019, 1 a.m. 5.0 ppb (5) 1.8 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 5.0
 
Sept. 14, 2019, midnight 4.8 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 4.0
 
Sept. 13, 2019, 11 p.m. 7.0 ppb (6) 2.4 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 6.0
 
Sept. 13, 2019, 10 p.m. 6.4 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 6.0
 
Sept. 13, 2019, 9 p.m. 8.3 ppb (8) 3.2 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 13, 2019, 8 p.m. 8.3 ppb (8) 3.3 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 13, 2019, 7 p.m. 12.8 ppb (12) 6.3 ppb (6) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 12.0
 
Sept. 13, 2019, 6 p.m. 9.1 ppb (8) 3.5 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 8.0
 
Sept. 13, 2019, 5 p.m. 11.9 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, 4 p.m. 11.3 ppb (10) 5.2 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 13, 2019, 3 p.m. 11.5 ppb (11) 5.4 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 13, 2019, 2 p.m. 11.5 ppb (11) 5.6 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, 1 p.m. 12.9 ppb (12) 5.9 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, noon 17.9 ppb (17) 9.3 ppb (9) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 11 a.m. 15.0 ppb (14) 6.7 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2019, 10 a.m. 12.2 ppb (11) 5.1 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, 9 a.m. 5.4 ppb (5) 2.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, 8 a.m. 4.7 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 13, 2019, 7 a.m. 3.0 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 13, 2019, 6 a.m. 3.3 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 5 a.m. 2.4 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 13, 2019, 4 a.m. 3.7 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2019, 3 a.m. 4.9 ppb (5) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, 2 a.m. 7.2 ppb (7) 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
 
Sept. 13, 2019, 1 a.m. 7.8 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 13, 2019, midnight 8.5 ppb (8) 1.7 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
 
Sept. 12, 2019, 11 p.m. 10.4 ppb (10) 2.2 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 12, 2019, 10 p.m. 7.6 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 12, 2019, 9 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 7.0 μg/m3 (29) 29.0
 
Sept. 12, 2019, 8 p.m. 7.2 ppb (7) 1.1 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
Sept. 12, 2019, 7 p.m. 8.2 ppb (8) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 12, 2019, 6 p.m. 4.3 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 59.0