ID: 472

AQSQID: 245100040

Site Name: Oldtown

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

Updated: April 10, 2021, 11:43 a.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
April 10, 2021, 10 a.m. 5.7 ppb (6) 1.5 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
 
April 10, 2021, 9 a.m. 4.4 ppb (5) 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) 5.0
 
April 10, 2021, 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 1.0 μg/m3 (5) 6.0
 
April 10, 2021, 7 a.m. 6.3 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
 
April 10, 2021, 6 a.m. 5.9 ppb (6) 1.2 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
 
April 10, 2021, 5 a.m. 9.8 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 10.0
 
April 10, 2021, 4 a.m. 8.3 ppb (8) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 10, 2021, 3 a.m. 11.8 ppb (12) 4.1 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 10, 2021, 2 a.m. 11.7 ppb (12) 3.7 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 10, 2021, 1 a.m. 15.1 ppb (15) 4.9 ppb (5) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 15.0
 
April 10, 2021, midnight 16.3 ppb (16) 5.2 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 16.0
 
April 9, 2021, 11 p.m. 17.6 ppb (17) 5.5 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 17.0
 
April 9, 2021, 10 p.m. 14.0 ppb (14) 3.7 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 14.0
 
April 9, 2021, 9 p.m. 15.2 ppb (15) 4.8 ppb (5) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 15.0
 
April 9, 2021, 8 p.m. 18.9 ppb (18) 7.4 ppb (7) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 9, 2021, 7 p.m. 17.2 ppb (17) 7.9 ppb (8) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 17.0
 
April 9, 2021, 6 p.m. 10.2 ppb (10) 3.5 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 9, 2021, 5 p.m. 14.0 ppb (14) 5.0 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 14.0
 
April 9, 2021, 4 p.m. 18.1 ppb (18) 6.0 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 18.0
 
April 9, 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
 
April 9, 2021, 2 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
 
April 9, 2021, 1 p.m. 16.7 ppb (16) 5.4 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
 
April 9, 2021, noon 16.7 ppb (16) 4.9 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 9, 2021, 11 a.m. 16.5 ppb (16) 3.8 ppb (4) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 9, 2021, 10 a.m. 16.5 ppb (16) 4.6 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 9, 2021, 9 a.m. 14.5 ppb (14) 2.9 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 14.0
 
April 9, 2021, 8 a.m. 9.6 ppb (10) 1.7 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 10.0
 
April 9, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 0.0
April 9, 2021, 6 a.m. 8.4 ppb (8) 0.7 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 8.0
 
April 9, 2021, 5 a.m. 8.4 ppb (8) 0.7 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 8.0
 
April 9, 2021, 4 a.m. 9.7 ppb (10) 1.5 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 10.0
 
April 9, 2021, 3 a.m. 11.2 ppb (11) 1.8 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 11.0
 
April 9, 2021, 2 a.m. 12.2 ppb (12) 3.1 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 12.0
 
April 9, 2021, 1 a.m. 15.2 ppb (15) 2.4 ppb (3) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 15.0
 
April 9, 2021, midnight 17.4 ppb (17) 3.1 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 17.0
 
April 8, 2021, 11 p.m. 20.8 ppb (20) 2.9 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 20.0
 
April 8, 2021, 10 p.m. 13.6 ppb (13) 2.9 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 13.0
 
April 8, 2021, 9 p.m. 9.4 ppb (9) 2.4 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 8, 2021, 8 p.m. 8.7 ppb (9) 2.6 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 9.0
 
April 8, 2021, 7 p.m. 9.4 ppb (9) 3.2 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 9.0
 
April 8, 2021, 6 p.m. 10.5 ppb (10) 3.8 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 10.0
 
April 8, 2021, 5 p.m. 8.1 ppb (8) 2.9 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 8, 2021, 4 p.m. 15.7 ppb (15) 6.1 ppb (6) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2021, 3 p.m. 11.4 ppb (11) 3.7 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 8, 2021, 2 p.m. 14.9 ppb (15) 5.5 ppb (6) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 8, 2021, 1 p.m. 18.9 ppb (18) 5.8 ppb (6) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 8, 2021, noon 23.8 ppb (23) 7.1 ppb (7) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 8, 2021, 11 a.m. 30.6 ppb (29) 7.9 ppb (8) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 8, 2021, 10 a.m. 17.2 ppb (17) 3.9 ppb (4) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2021, 9 a.m. 10.9 ppb (11) 2.8 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2021, 8 a.m. 11.6 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 8, 2021, 7 a.m. 8.2 ppb (8) 1.5 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 8, 2021, 6 a.m. 10.3 ppb (10) 1.8 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 8, 2021, 5 a.m. 12.5 ppb (12) 1.7 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2021, 4 a.m. 9.6 ppb (10) 1.3 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2021, 3 a.m. 14.5 ppb (14) 2.4 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2021, 2 a.m. 18.0 ppb (17) 2.7 ppb (3) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 8, 2021, 1 a.m. 14.7 ppb (14) 2.1 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 8, 2021, midnight 20.8 ppb (20) 2.5 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 7, 2021, 11 p.m. 27.1 ppb (26) 6.0 ppb (6) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 7, 2021, 10 p.m. 20.9 ppb (20) 3.1 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
April 7, 2021, 9 p.m. 30.5 ppb (29) 4.8 ppb (5) N/A 26.0 ppb (25) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
April 7, 2021, 8 p.m. 22.6 ppb (22) 4.4 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
April 7, 2021, 7 p.m. 15.3 ppb (15) 3.5 ppb (4) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
April 7, 2021, 6 p.m. 19.0 ppb (18) 5.1 ppb (5) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
April 7, 2021, 5 p.m. 17.7 ppb (17) 5.1 ppb (5) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 7, 2021, 4 p.m. 28.1 ppb (27) 8.9 ppb (9) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
April 7, 2021, 3 p.m. 30.8 ppb (30) 9.7 ppb (10) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
April 7, 2021, 2 p.m. 56.1 ppb (54) 22.2 ppb (21) N/A 34.0 ppb (33) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
April 7, 2021, 1 p.m. 56.1 ppb (54) 20.9 ppb (20) N/A 35.0 ppb (34) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
April 7, 2021, noon 54.3 ppb (52) 19.3 ppb (19) N/A 35.0 ppb (34) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 52.0
 
April 7, 2021, 11 a.m. 45.5 ppb (43) 13.4 ppb (13) N/A 32.0 ppb (31) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 43.0
 
April 7, 2021, 10 a.m. 33.1 ppb (32) 5.7 ppb (6) N/A 27.0 ppb (26) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
April 7, 2021, 9 a.m. 21.3 ppb (21) 1.8 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
 
April 7, 2021, 8 a.m. 22.3 ppb (22) 1.6 ppb (2) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
April 7, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
April 7, 2021, 6 a.m. 61.7 ppb (60) 14.8 ppb (14) N/A 47.0 ppb (45) N/A N/A N/A N/A N/A 20.0 μg/m3 (68) 68.0
 
April 7, 2021, 5 a.m. 62.7 ppb (61) 10.0 ppb (10) N/A 53.0 ppb (50) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
April 7, 2021, 4 a.m. 66.7 ppb (65) 13.9 ppb (14) N/A 53.0 ppb (50) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 65.0
 
April 7, 2021, 3 a.m. 58.8 ppb (57) 10.6 ppb (10) N/A 48.0 ppb (46) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
April 7, 2021, 2 a.m. 47.9 ppb (46) 6.7 ppb (7) N/A 41.0 ppb (39) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
April 7, 2021, 1 a.m. 32.2 ppb (31) 4.3 ppb (5) N/A 28.0 ppb (27) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
April 7, 2021, midnight 44.8 ppb (43) 6.2 ppb (6) N/A 39.0 ppb (37) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
April 6, 2021, 11 p.m. 29.4 ppb (28) 4.3 ppb (5) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
April 6, 2021, 10 p.m. 9.4 ppb (9) 1.8 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
April 6, 2021, 9 p.m. 8.7 ppb (9) 2.1 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 6, 2021, 8 p.m. 6.8 ppb (7) 1.4 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 6, 2021, 7 p.m. 7.1 ppb (7) 1.6 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
 
April 6, 2021, 6 p.m. 7.0 ppb (7) 1.4 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 6, 2021, 5 p.m. 7.5 ppb (8) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 6, 2021, 4 p.m. 9.5 ppb (9) 3.1 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
 
April 6, 2021, 3 p.m. 9.5 ppb (9) 2.5 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 6, 2021, 2 p.m. 14.1 ppb (14) 3.9 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 14.0
 
April 6, 2021, 1 p.m. 12.9 ppb (13) 3.7 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
 
April 6, 2021, noon 20.4 ppb (20) 6.5 ppb (7) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 6, 2021, 11 a.m. 27.4 ppb (26) 8.1 ppb (8) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 6, 2021, 10 a.m. 20.4 ppb (20) 4.5 ppb (5) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 20.0
 
April 6, 2021, 9 a.m. 9.4 ppb (9) 1.4 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2021, 8 a.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 7.0 μg/m3 (30) 30.0
 
April 6, 2021, 7 a.m. 7.3 ppb (7) 0.5 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 6, 2021, 6 a.m. 7.7 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
 
April 6, 2021, 5 a.m. 10.6 ppb (10) 1.5 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 6, 2021, 4 a.m. 11.7 ppb (12) 0.8 ppb (1) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2021, 3 a.m. 29.5 ppb (28) 3.6 ppb (4) N/A 26.0 ppb (25) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 6, 2021, 2 a.m. 24.0 ppb (23) 0.8 ppb (1) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 6, 2021, 1 a.m. 26.8 ppb (26) 1.0 ppb (1) N/A 26.0 ppb (25) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 6, 2021, midnight 23.5 ppb (23) 1.3 ppb (2) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
April 5, 2021, 11 p.m. 12.8 ppb (13) 0.4 ppb (1) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 5, 2021, 10 p.m. 7.8 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
 
April 5, 2021, 9 p.m. 5.9 ppb (6) 1.0 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
 
April 5, 2021, 8 p.m. 5.7 ppb (6) 1.2 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
 
April 5, 2021, 7 p.m. 5.5 ppb (6) 1.1 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
 
April 5, 2021, 6 p.m. 5.6 ppb (6) 1.3 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 5, 2021, 5 p.m. 6.2 ppb (6) 1.6 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 5, 2021, 4 p.m. 7.4 ppb (7) 2.1 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2021, 3 p.m. 5.7 ppb (6) 1.5 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 5, 2021, 2 p.m. 8.0 ppb (8) 2.3 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 5, 2021, 1 p.m. 13.1 ppb (13) 3.1 ppb (3) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 5, 2021, noon 22.5 ppb (22) 4.9 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
April 5, 2021, 11 a.m. 39.8 ppb (38) 7.6 ppb (8) N/A 32.0 ppb (31) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
April 5, 2021, 10 a.m. 34.0 ppb (33) 4.3 ppb (5) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
April 5, 2021, 9 a.m. 23.1 ppb (22) 1.8 ppb (2) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 5, 2021, 8 a.m. 41.1 ppb (39) 6.9 ppb (7) N/A 34.0 ppb (33) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 39.0
 
April 5, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 5, 2021, 6 a.m. 5.2 ppb (5) 0.2 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
 
April 5, 2021, 5 a.m. 6.3 ppb (6) 0.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 5, 2021, 4 a.m. 8.6 ppb (9) 1.3 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 5, 2021, 3 a.m. 10.0 ppb (10) 1.3 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 5, 2021, 2 a.m. 21.5 ppb (21) 1.2 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
 
April 5, 2021, 1 a.m. 23.7 ppb (23) 1.2 ppb (2) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
April 5, 2021, midnight 9.9 ppb (10) 0.2 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 4, 2021, 11 p.m. 6.0 ppb (6) 0.2 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
 
April 4, 2021, 10 p.m. 6.1 ppb (6) 0.5 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
 
April 4, 2021, 9 p.m. 5.5 ppb (6) 0.6 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
 
April 4, 2021, 8 p.m. 4.7 ppb (5) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 4, 2021, 7 p.m. 5.3 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 4, 2021, 6 p.m. 4.9 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
April 4, 2021, 5 p.m. 4.9 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
April 4, 2021, 4 p.m. 4.5 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
April 4, 2021, 3 p.m. 4.0 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 4, 2021, 2 p.m. 13.6 ppb (13) 4.3 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 4, 2021, 1 p.m. 34.0 ppb (33) 11.8 ppb (12) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
April 4, 2021, noon 38.7 ppb (37) 11.9 ppb (12) N/A 27.0 ppb (26) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 4, 2021, 11 a.m. 34.9 ppb (33) 6.9 ppb (7) N/A 28.0 ppb (27) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 4, 2021, 10 a.m. 26.8 ppb (26) 4.1 ppb (4) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 4, 2021, 9 a.m. 15.1 ppb (15) 0.8 ppb (1) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 4, 2021, 8 a.m. 15.1 ppb (15) 0.7 ppb (1) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 4, 2021, 7 a.m. 19.4 ppb (19) 3.1 ppb (3) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
April 4, 2021, 6 a.m. 21.1 ppb (20) 3.2 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
April 4, 2021, 5 a.m. 21.4 ppb (21) 1.8 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 4, 2021, 4 a.m. 20.7 ppb (20) 2.3 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
April 4, 2021, 3 a.m. 29.6 ppb (28) 4.3 ppb (5) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
April 4, 2021, 2 a.m. 29.0 ppb (28) 6.2 ppb (6) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
April 4, 2021, 1 a.m. 32.4 ppb (31) 7.0 ppb (7) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 31.0
 
April 4, 2021, midnight 13.6 ppb (13) 2.4 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 3, 2021, 11 p.m. 6.3 ppb (6) 0.4 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
 
April 3, 2021, 10 p.m. 4.6 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 3, 2021, 9 p.m. 4.1 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 3, 2021, 8 p.m. 3.3 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 3, 2021, 7 p.m. 4.6 ppb (5) 1.5 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 3, 2021, 6 p.m. 3.6 ppb (4) 1.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 3, 2021, 5 p.m. 5.2 ppb (5) 1.6 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 3, 2021, 4 p.m. 3.5 ppb (4) 1.1 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 3, 2021, 3 p.m. 4.2 ppb (4) 1.5 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 3, 2021, 2 p.m. 4.5 ppb (5) 1.3 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 3, 2021, 1 p.m. 7.1 ppb (7) 2.3 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 3, 2021, noon 11.6 ppb (11) 2.7 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 3, 2021, 11 a.m. 14.8 ppb (14) 1.6 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0