ID: 472

AQSQID: 245100040

Site Name: Oldtown

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

Updated: Jan. 20, 2021, 7:31 p.m.

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. 20, 2021, 6 p.m. 6.8 ppb (7) 2.4 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2021, 5 p.m. 6.6 ppb (7) 2.4 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2021, 4 p.m. 6.8 ppb (7) 2.7 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2021, 3 p.m. 7.6 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2021, 2 p.m. 8.2 ppb (8) 3.2 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 8.0
 
Jan. 20, 2021, 1 p.m. 7.7 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 20, 2021, noon 9.2 ppb (9) 2.3 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2021, 11 a.m. 10.2 ppb (10) 2.5 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2021, 10 a.m. 19.6 ppb (19) 1.7 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2021, 9 a.m. 22.8 ppb (22) 2.0 ppb (2) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 20, 2021, 8 a.m. 72.3 ppb (71) 35.4 ppb (34) N/A 37.0 ppb (35) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 71.0
 
Jan. 20, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Jan. 20, 2021, 6 a.m. 85.0 ppb (85) 45.2 ppb (43) N/A 40.0 ppb (38) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 85.0
 
Jan. 20, 2021, 5 a.m. 116.7 ppb (104) 73.5 ppb (72) N/A 43.0 ppb (41) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 104.0
 
Jan. 20, 2021, 4 a.m. 99.7 ppb (100) 56.3 ppb (54) N/A 43.0 ppb (41) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 100.0
 
Jan. 20, 2021, 3 a.m. 46.5 ppb (44) 12.2 ppb (12) N/A 34.0 ppb (33) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 44.0
 
Jan. 20, 2021, 2 a.m. 65.2 ppb (63) 29.9 ppb (29) N/A 35.0 ppb (34) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 63.0
 
Jan. 20, 2021, 1 a.m. 34.7 ppb (33) 5.4 ppb (6) N/A 29.0 ppb (28) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 33.0
 
Jan. 20, 2021, midnight 32.8 ppb (31) 5.1 ppb (5) N/A 28.0 ppb (27) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 31.0
 
Jan. 19, 2021, 11 p.m. 26.3 ppb (25) 3.6 ppb (4) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 25.0
 
Jan. 19, 2021, 10 p.m. 12.6 ppb (12) 1.3 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 12.0
 
Jan. 19, 2021, 9 p.m. 7.6 ppb (8) 1.5 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 19, 2021, 8 p.m. 6.6 ppb (7) 1.9 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 19, 2021, 7 p.m. 9.5 ppb (9) 3.7 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 19, 2021, 6 p.m. 8.4 ppb (8) 3.1 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 19, 2021, 5 p.m. 16.6 ppb (16) 5.7 ppb (6) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 16.0
 
Jan. 19, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2021, 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. 19, 2021, 2 p.m. 38.7 ppb (37) 13.9 ppb (14) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 37.0
 
Jan. 19, 2021, 1 p.m. 32.7 ppb (31) 9.9 ppb (10) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 31.0
 
Jan. 19, 2021, noon 30.7 ppb (29) 7.7 ppb (8) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 29.0
 
Jan. 19, 2021, 11 a.m. 31.3 ppb (30) 7.3 ppb (7) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 30.0
 
Jan. 19, 2021, 10 a.m. 18.2 ppb (18) 2.4 ppb (3) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 9 a.m. 14.4 ppb (14) 1.0 ppb (1) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 8 a.m. 10.7 ppb (11) 1.0 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 19, 2021, 7 a.m. 10.0 ppb (10) 1.1 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 6 a.m. 9.6 ppb (10) 0.9 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 5 a.m. 10.1 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 10.0
 
Jan. 19, 2021, 4 a.m. 11.1 ppb (11) 1.0 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2021, 3 a.m. 13.5 ppb (13) 1.5 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2021, 2 a.m. 15.8 ppb (15) 1.7 ppb (2) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 15.0
 
Jan. 19, 2021, 1 a.m. 14.4 ppb (14) 1.3 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 14.0
 
Jan. 19, 2021, midnight 10.8 ppb (11) 0.9 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 11.0
 
Jan. 18, 2021, 11 p.m. 12.1 ppb (12) 1.5 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 12.0
 
Jan. 18, 2021, 10 p.m. 9.2 ppb (9) 1.1 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 18, 2021, 9 p.m. 7.9 ppb (8) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 8.0
 
Jan. 18, 2021, 8 p.m. 6.5 ppb (7) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 7.0
 
Jan. 18, 2021, 7 p.m. 7.4 ppb (7) 3.1 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 18, 2021, 6 p.m. 7.0 ppb (7) 2.5 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 7.0
 
Jan. 18, 2021, 5 p.m. 6.6 ppb (7) 2.7 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 7.0
 
Jan. 18, 2021, 4 p.m. 6.1 ppb (6) 2.9 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 6.0
 
Jan. 18, 2021, 3 p.m. 8.5 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 9.0
 
Jan. 18, 2021, 2 p.m. 14.7 ppb (14) 4.2 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 14.0
 
Jan. 18, 2021, 1 p.m. 25.4 ppb (24) 7.0 ppb (7) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 24.0
 
Jan. 18, 2021, noon 22.9 ppb (22) 5.1 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 22.0
 
Jan. 18, 2021, 11 a.m. 19.4 ppb (19) 2.7 ppb (3) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 19.0
 
Jan. 18, 2021, 10 a.m. 16.7 ppb (16) 1.7 ppb (2) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2021, 9 a.m. 15.0 ppb (15) 1.5 ppb (2) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2021, 8 a.m. 16.0 ppb (16) 1.3 ppb (2) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Jan. 18, 2021, 6 a.m. 16.7 ppb (16) 1.6 ppb (2) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 18, 2021, 5 a.m. 16.9 ppb (16) 1.6 ppb (2) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 18, 2021, 4 a.m. 17.8 ppb (17) 1.9 ppb (2) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 18, 2021, 3 a.m. 19.6 ppb (19) 3.7 ppb (4) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2021, 2 a.m. 14.5 ppb (14) 1.8 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 1 a.m. 16.8 ppb (16) 2.3 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 16.0
 
Jan. 18, 2021, midnight 20.9 ppb (20) 3.4 ppb (4) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 20.0
 
Jan. 17, 2021, 11 p.m. 20.0 ppb (19) 3.4 ppb (4) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 19.0
 
Jan. 17, 2021, 10 p.m. 13.0 ppb (13) 1.8 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 17, 2021, 9 p.m. 9.1 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 17, 2021, 8 p.m. 8.2 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 17, 2021, 7 p.m. 6.0 ppb (6) 1.6 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 6.0
 
Jan. 17, 2021, 6 p.m. 5.4 ppb (6) 1.6 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 6.0
 
Jan. 17, 2021, 5 p.m. 5.6 ppb (6) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 6.0
 
Jan. 17, 2021, 4 p.m. 6.4 ppb (7) 2.7 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 7.0
 
Jan. 17, 2021, 3 p.m. 7.7 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 8.0
 
Jan. 17, 2021, 2 p.m. 7.9 ppb (8) 2.3 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 17, 2021, 1 p.m. 13.2 ppb (13) 4.1 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2021, noon 10.2 ppb (10) 1.8 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2021, 11 a.m. 13.4 ppb (13) 2.6 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 13.0
 
Jan. 17, 2021, 10 a.m. 10.1 ppb (10) 1.1 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 10.0
 
Jan. 17, 2021, 9 a.m. 10.4 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2021, 8 a.m. 8.8 ppb (9) 0.6 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2021, 7 a.m. 6.8 ppb (7) 0.7 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. 17, 2021, 6 a.m. 8.0 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2021, 5 a.m. 8.2 ppb (8) 0.8 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 17, 2021, 4 a.m. 8.5 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 17, 2021, 3 a.m. 8.7 ppb (9) 0.8 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 17, 2021, 2 a.m. 8.0 ppb (8) 0.7 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 17, 2021, 1 a.m. 8.3 ppb (8) 0.7 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2021, midnight 9.9 ppb (10) 1.2 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2021, 11 p.m. 12.2 ppb (12) 1.5 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 16, 2021, 10 p.m. 8.8 ppb (9) 0.8 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 16, 2021, 9 p.m. 5.8 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2021, 8 p.m. 6.1 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 16, 2021, 7 p.m. 5.7 ppb (6) 1.3 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 16, 2021, 6 p.m. 6.8 ppb (7) 2.2 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 16, 2021, 5 p.m. 7.6 ppb (8) 2.7 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2021, 4 p.m. 7.2 ppb (7) 2.5 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 16, 2021, 3 p.m. 6.7 ppb (7) 1.7 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
 
Jan. 16, 2021, 2 p.m. 10.9 ppb (11) 3.2 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2021, 1 p.m. 15.9 ppb (15) 3.4 ppb (4) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 16, 2021, noon 14.4 ppb (14) 1.9 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 14.0
 
Jan. 16, 2021, 11 a.m. 13.3 ppb (13) 1.1 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2021, 10 a.m. 12.1 ppb (12) 0.5 ppb (1) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 16, 2021, 9 a.m. 12.7 ppb (12) 0.5 ppb (1) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 12.0
 
Jan. 16, 2021, 8 a.m. 8.9 ppb (9) 0.5 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 16, 2021, 7 a.m. 18.3 ppb (18) 1.0 ppb (1) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 16, 2021, 6 a.m. 21.7 ppb (21) 2.0 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 16, 2021, 5 a.m. 19.0 ppb (18) 2.4 ppb (3) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
Jan. 16, 2021, 4 a.m. 16.8 ppb (16) 2.7 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 16, 2021, 3 a.m. 19.3 ppb (19) 3.2 ppb (4) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Jan. 16, 2021, 2 a.m. 25.3 ppb (24) 3.6 ppb (4) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 16, 2021, 1 a.m. 28.3 ppb (27) 4.1 ppb (4) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 16, 2021, midnight 38.4 ppb (37) 5.5 ppb (6) N/A 33.0 ppb (32) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Jan. 15, 2021, 11 p.m. 27.5 ppb (26) 3.4 ppb (4) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 15, 2021, 10 p.m. 24.5 ppb (24) 3.9 ppb (4) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 15, 2021, 9 p.m. 36.4 ppb (35) 6.5 ppb (7) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 15, 2021, 8 p.m. 33.3 ppb (32) 7.4 ppb (7) N/A 26.0 ppb (25) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Jan. 15, 2021, 7 p.m. 30.3 ppb (29) 7.8 ppb (8) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
Jan. 15, 2021, 6 p.m. 22.2 ppb (21) 6.5 ppb (7) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
Jan. 15, 2021, 5 p.m. 20.8 ppb (20) 7.6 ppb (8) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Jan. 15, 2021, 4 p.m. 23.9 ppb (23) 9.1 ppb (9) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Jan. 15, 2021, 3 p.m. 31.7 ppb (30) 11.6 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Jan. 15, 2021, 2 p.m. 44.5 ppb (42) 20.8 ppb (20) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 27.0 μg/m3 (83) 83.0
 
Jan. 15, 2021, 1 p.m. 50.3 ppb (48) 21.8 ppb (21) N/A 29.0 ppb (28) N/A N/A N/A N/A N/A 24.0 μg/m3 (77) 77.0
 
Jan. 15, 2021, noon 46.6 ppb (44) 16.9 ppb (16) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 26.0 μg/m3 (81) 81.0
 
Jan. 15, 2021, 11 a.m. 43.2 ppb (41) 13.4 ppb (13) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 27.0 μg/m3 (83) 83.0
 
Jan. 15, 2021, 10 a.m. 43.3 ppb (41) 12.1 ppb (12) N/A 31.0 ppb (30) N/A N/A N/A N/A N/A 27.0 μg/m3 (83) 83.0
 
Jan. 15, 2021, 9 a.m. 46.3 ppb (44) 12.9 ppb (13) N/A 33.0 ppb (32) N/A N/A N/A N/A N/A 29.0 μg/m3 (87) 87.0
 
Jan. 15, 2021, 8 a.m. 52.1 ppb (50) 17.9 ppb (17) N/A 34.0 ppb (33) N/A N/A N/A N/A N/A 24.0 μg/m3 (77) 77.0
 
Jan. 15, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 21.0 μg/m3 (70) 70.0
 
Jan. 15, 2021, 6 a.m. 149.5 ppb (111) 110.2 ppb (103) N/A 39.0 ppb (37) N/A N/A N/A N/A N/A 23.0 μg/m3 (74) 111.0
 
Jan. 15, 2021, 5 a.m. 108.5 ppb (103) 69.3 ppb (68) N/A 39.0 ppb (37) N/A N/A N/A N/A N/A 20.0 μg/m3 (68) 103.0
 
Jan. 15, 2021, 4 a.m. 142.8 ppb (109) 101.4 ppb (102) N/A 41.0 ppb (39) N/A N/A N/A N/A N/A 24.0 μg/m3 (77) 109.0
 
Jan. 15, 2021, 3 a.m. 135.4 ppb (108) 93.1 ppb (93) N/A 42.0 ppb (40) N/A N/A N/A N/A N/A 33.0 μg/m3 (95) 108.0
 
Jan. 15, 2021, 2 a.m. 126.0 ppb (106) 81.8 ppb (81) N/A 44.0 ppb (42) N/A N/A N/A N/A N/A 23.0 μg/m3 (74) 106.0
 
Jan. 15, 2021, 1 a.m. 138.7 ppb (109) 93.5 ppb (94) N/A 45.0 ppb (43) N/A N/A N/A N/A N/A 27.0 μg/m3 (83) 109.0
 
Jan. 15, 2021, midnight 101.6 ppb (102) 55.9 ppb (54) N/A 46.0 ppb (44) N/A N/A N/A N/A N/A 23.0 μg/m3 (74) 102.0
 
Jan. 14, 2021, 11 p.m. 73.7 ppb (72) 28.6 ppb (27) N/A 45.0 ppb (43) N/A N/A N/A N/A N/A 23.0 μg/m3 (74) 74.0
 
Jan. 14, 2021, 10 p.m. 65.6 ppb (64) 24.2 ppb (23) N/A 41.0 ppb (39) N/A N/A N/A N/A N/A 19.0 μg/m3 (66) 66.0
 
Jan. 14, 2021, 9 p.m. 55.9 ppb (54) 19.2 ppb (19) N/A 37.0 ppb (35) N/A N/A N/A N/A N/A 24.0 μg/m3 (77) 77.0
 
Jan. 14, 2021, 8 p.m. 53.7 ppb (51) 22.4 ppb (22) N/A 31.0 ppb (30) N/A N/A N/A N/A N/A 20.0 μg/m3 (68) 68.0
 
Jan. 14, 2021, 7 p.m. 16.5 ppb (16) 5.3 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 14, 2021, 6 p.m. 13.4 ppb (13) 4.6 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 14, 2021, 5 p.m. 14.3 ppb (14) 5.4 ppb (6) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 14, 2021, 4 p.m. 20.3 ppb (20) 6.4 ppb (7) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 20.0
 
Jan. 14, 2021, 3 p.m. 50.2 ppb (48) 22.5 ppb (22) N/A 28.0 ppb (27) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Jan. 14, 2021, 2 p.m. 87.5 ppb (87) 55.5 ppb (53) N/A 32.0 ppb (31) N/A N/A N/A N/A N/A 21.0 μg/m3 (70) 87.0
 
Jan. 14, 2021, 1 p.m. 96.3 ppb (97) 65.4 ppb (64) N/A 31.0 ppb (30) N/A N/A N/A N/A N/A 30.0 μg/m3 (89) 97.0
 
Jan. 14, 2021, noon 102.1 ppb (102) 70.6 ppb (69) N/A 31.0 ppb (30) N/A N/A N/A N/A N/A 25.0 μg/m3 (79) 102.0
 
Jan. 14, 2021, 11 a.m. 159.5 ppb (113) 124.6 ppb (106) N/A 35.0 ppb (34) N/A N/A N/A N/A N/A 26.0 μg/m3 (81) 113.0
 
Jan. 14, 2021, 10 a.m. 162.0 ppb (113) 125.2 ppb (106) N/A 37.0 ppb (35) N/A N/A N/A N/A N/A 19.0 μg/m3 (66) 113.0
 
Jan. 14, 2021, 9 a.m. 192.9 ppb (119) 154.4 ppb (112) N/A 39.0 ppb (37) N/A N/A N/A N/A N/A 28.0 μg/m3 (85) 119.0
 
Jan. 14, 2021, 8 a.m. 176.1 ppb (116) 138.3 ppb (109) N/A 38.0 ppb (36) N/A N/A N/A N/A N/A 25.0 μg/m3 (79) 116.0
 
Jan. 14, 2021, 7 a.m. 164.5 ppb (114) 125.9 ppb (106) N/A 39.0 ppb (37) N/A N/A N/A N/A N/A 28.0 μg/m3 (85) 114.0
 
Jan. 14, 2021, 6 a.m. 185.4 ppb (117) 144.4 ppb (110) N/A 41.0 ppb (39) N/A N/A N/A N/A N/A 27.0 μg/m3 (83) 117.0
 
Jan. 14, 2021, 5 a.m. 144.5 ppb (110) 107.9 ppb (103) N/A 37.0 ppb (35) N/A N/A N/A N/A N/A 30.0 μg/m3 (89) 110.0
 
Jan. 14, 2021, 4 a.m. 140.3 ppb (109) 101.8 ppb (102) N/A 38.0 ppb (36) N/A N/A N/A N/A N/A 30.0 μg/m3 (89) 109.0
 
Jan. 14, 2021, 3 a.m. 100.4 ppb (101) 60.3 ppb (58) N/A 40.0 ppb (38) N/A N/A N/A N/A N/A 23.0 μg/m3 (74) 101.0
 
Jan. 14, 2021, 2 a.m. 61.8 ppb (60) 24.1 ppb (23) N/A 38.0 ppb (36) N/A N/A N/A N/A N/A 20.0 μg/m3 (68) 68.0
 
Jan. 14, 2021, 1 a.m. 37.6 ppb (36) 6.9 ppb (7) N/A 31.0 ppb (30) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Jan. 14, 2021, midnight 32.0 ppb (31) 6.4 ppb (7) N/A 26.0 ppb (25) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Jan. 13, 2021, 11 p.m. 26.2 ppb (25) 4.5 ppb (5) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Jan. 13, 2021, 10 p.m. 39.8 ppb (38) 9.0 ppb (9) N/A 31.0 ppb (30) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Jan. 13, 2021, 9 p.m. 23.2 ppb (22) 4.7 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 13, 2021, 8 p.m. 27.5 ppb (26) 9.2 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 13, 2021, 7 p.m. 30.3 ppb (29) 11.3 ppb (11) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0