AQSQID: 245100040

Site Name: Oldtown

Location: Baltimore (Old Town), MD

Reporting: True, Located: True

Current AQI: 33.0

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 4, 2020, 11 p.m. 16.3 ppb (15) 2.5 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
April 4, 2020, 10 p.m. 9.7 ppb (9) 2.2 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
April 4, 2020, 9 p.m. 19.3 ppb (18) 4.8 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 18.0
 
April 4, 2020, 8 p.m. 22.1 ppb (20) 6.9 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 20.0
 
April 4, 2020, 7 p.m. 9.6 ppb (9) 2.5 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
April 4, 2020, 6 p.m. 6.4 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 6.0
 
April 4, 2020, 5 p.m. 6.2 ppb (6) 2.3 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 6.0
 
April 4, 2020, 4 p.m. 5.8 ppb (5) 2.6 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 5.0
 
April 4, 2020, 3 p.m. 5.9 ppb (5) 2.8 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
April 4, 2020, 2 p.m. 5.0 ppb (5) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 5.0
 
April 4, 2020, 1 p.m. 4.8 ppb (4) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 4.0
 
April 4, 2020, noon 6.4 ppb (6) 1.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 6.0
 
April 4, 2020, 11 a.m. 8.3 ppb (8) 1.6 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 8.0
 
April 4, 2020, 10 a.m. 5.6 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 5.0
 
April 4, 2020, 9 a.m. 4.2 ppb (4) 0.3 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
 
April 4, 2020, 8 a.m. 3.6 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
April 4, 2020, 7 a.m. 3.1 ppb (3) 0.3 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
 
April 4, 2020, 6 a.m. 3.2 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 3.0
 
April 4, 2020, 5 a.m. 3.6 ppb (3) 0.3 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
 
April 4, 2020, 4 a.m. 3.1 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 3.0
 
April 4, 2020, 3 a.m. 3.6 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 3.0
 
April 4, 2020, 2 a.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 -3.0 μg/m3 (0) 4.0
 
April 4, 2020, 1 a.m. 3.9 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -4.0 μg/m3 (0) 4.0
 
April 4, 2020, midnight 5.2 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 5.0
 
April 3, 2020, 11 p.m. 6.2 ppb (6) 1.6 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
 
April 3, 2020, 10 p.m. 7.9 ppb (7) 2.9 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
 
April 3, 2020, 9 p.m. 8.0 ppb (7) 2.6 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
April 3, 2020, 8 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 1.0 μg/m3 (4) 6.0
 
April 3, 2020, 7 p.m. 4.6 ppb (4) 1.5 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
 
April 3, 2020, 6 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 4.0 μg/m3 (17) 17.0
 
April 3, 2020, 5 p.m. 4.4 ppb (4) 1.6 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
 
April 3, 2020, 4 p.m. 4.4 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, 3 p.m. 5.4 ppb (5) 2.3 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 5.0
 
April 3, 2020, 2 p.m. 4.3 ppb (4) 1.3 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
 
April 3, 2020, 1 p.m. 7.6 ppb (7) 2.5 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, noon 7.6 ppb (7) 1.9 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 3, 2020, 11 a.m. 9.4 ppb (9) 1.6 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 3, 2020, 10 a.m. 10.4 ppb (10) 1.0 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
 
April 3, 2020, 9 a.m. 4.4 ppb (4) 0.3 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
 
April 3, 2020, 8 a.m. 4.4 ppb (4) 0.2 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
 
April 3, 2020, 7 a.m. 3.4 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
April 3, 2020, 6 a.m. 2.5 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
April 3, 2020, 5 a.m. 4.2 ppb (4) 0.1 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
 
April 3, 2020, 4 a.m. 3.7 ppb (3) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 4.0
 
April 3, 2020, 3 a.m. 4.0 ppb (4) 0.2 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
 
April 3, 2020, 2 a.m. 8.0 ppb (7) 0.5 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 7.0
 
April 3, 2020, 1 a.m. 8.3 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, midnight 6.3 ppb (6) 0.3 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
 
April 2, 2020, 11 p.m. 6.5 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
April 2, 2020, 10 p.m. 5.6 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
 
April 2, 2020, 9 p.m. 3.8 ppb (4) 1.0 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
 
April 2, 2020, 8 p.m. 3.6 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 3.0
 
April 2, 2020, 7 p.m. 4.4 ppb (4) 1.4 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
 
April 2, 2020, 6 p.m. 4.4 ppb (4) 1.5 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
 
April 2, 2020, 5 p.m. 4.0 ppb (4) 1.4 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
 
April 2, 2020, 4 p.m. 7.4 ppb (7) 2.7 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 7.0
 
April 2, 2020, 3 p.m. 6.3 ppb (6) 2.2 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 6.0
 
April 2, 2020, 2 p.m. 9.1 ppb (8) 3.1 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
 
April 2, 2020, 1 p.m. 12.0 ppb (11) 3.7 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 2, 2020, noon 13.7 ppb (13) 3.1 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 2, 2020, 11 a.m. 24.8 ppb (23) 4.5 ppb (4) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
April 2, 2020, 10 a.m. 15.8 ppb (15) 1.3 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 2, 2020, 9 a.m. 11.3 ppb (10) 0.6 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
 
April 2, 2020, 8 a.m. 8.0 ppb (7) 0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 7.0
 
April 2, 2020, 7 a.m. 6.6 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 6.0
 
April 2, 2020, 6 a.m. 10.8 ppb (10) 0.2 ppb (0) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 10.0
 
April 2, 2020, 5 a.m. 5.2 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
April 2, 2020, 4 a.m. 4.6 ppb (4) 0.3 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
 
April 2, 2020, 3 a.m. 16.2 ppb (15) 1.1 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 2, 2020, 2 a.m. 29.1 ppb (27) 3.3 ppb (3) N/A 26.0 ppb (24) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 27.0
 
April 2, 2020, 1 a.m. 20.0 ppb (19) 1.8 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 19.0
 
April 2, 2020, midnight 12.7 ppb (12) 0.7 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
 
April 1, 2020, 11 p.m. 8.6 ppb (8) 0.7 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
April 1, 2020, 10 p.m. 7.5 ppb (7) 1.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
April 1, 2020, 9 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 3.0 μg/m3 (12) 12.0
 
April 1, 2020, 8 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 4.0 μg/m3 (17) 17.0
 
April 1, 2020, 7 p.m. 10.2 ppb (9) 3.1 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
 
April 1, 2020, 6 p.m. 8.9 ppb (8) 2.5 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
 
April 1, 2020, 5 p.m. 8.6 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
 
April 1, 2020, 4 p.m. 9.2 ppb (9) 3.4 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
 
April 1, 2020, 3 p.m. 9.1 ppb (8) 2.5 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 1, 2020, 2 p.m. 7.5 ppb (7) 2.6 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 1, 2020, 1 p.m. 10.7 ppb (10) 4.5 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
 
April 1, 2020, noon 12.9 ppb (12) 4.7 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 1, 2020, 11 a.m. 14.3 ppb (13) 3.0 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 1, 2020, 10 a.m. 11.8 ppb (11) 2.9 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 1, 2020, 9 a.m. 7.9 ppb (7) 1.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
April 1, 2020, 8 a.m. 7.4 ppb (7) 1.1 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 7.0
 
April 1, 2020, 7 a.m. 4.0 ppb (4) 0.2 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
 
April 1, 2020, 6 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 4.0 μg/m3 (17) 17.0
 
April 1, 2020, 5 a.m. 5.0 ppb (5) 0.7 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
 
April 1, 2020, 4 a.m. 4.9 ppb (5) 1.1 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
 
April 1, 2020, 3 a.m. 5.1 ppb (5) 1.4 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
 
April 1, 2020, 2 a.m. 6.7 ppb (6) 1.4 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
 
April 1, 2020, 1 a.m. 8.3 ppb (8) 2.0 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
 
April 1, 2020, midnight 7.6 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, 11 p.m. 8.6 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, 10 p.m. 9.9 ppb (9) 3.1 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 9.0
 
March 31, 2020, 9 p.m. 9.3 ppb (9) 2.8 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
 
March 31, 2020, 8 p.m. 10.3 ppb (10) 3.8 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 10.0
 
March 31, 2020, 7 p.m. 9.9 ppb (9) 3.6 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
 
March 31, 2020, 6 p.m. 12.7 ppb (12) 4.3 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 12.0
 
March 31, 2020, 5 p.m. 13.5 ppb (12) 5.6 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, 4 p.m. 13.0 ppb (12) 4.3 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 12.0
 
March 31, 2020, 3 p.m. 9.4 ppb (9) 4.1 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 9.0
 
March 31, 2020, 2 p.m. 9.5 ppb (9) 3.8 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 9.0
 
March 31, 2020, 1 p.m. 10.4 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, noon 11.6 ppb (11) 3.4 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, 11 a.m. 15.0 ppb (14) 3.7 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 14.0
 
March 31, 2020, 10 a.m. 12.1 ppb (11) 2.0 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
 
March 31, 2020, 9 a.m. 12.8 ppb (12) 1.2 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, 8 a.m. 13.2 ppb (12) 0.8 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
 
March 31, 2020, 7 a.m. 9.1 ppb (8) 0.3 ppb (0) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 8.0
 
March 31, 2020, 6 a.m. 8.2 ppb (8) 0.3 ppb (0) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, 5 a.m. 5.0 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 31, 2020, 4 a.m. 4.8 ppb (4) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 31, 2020, 3 a.m. 4.8 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
 
March 31, 2020, 2 a.m. 5.4 ppb (5) 0.6 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
 
March 31, 2020, 1 a.m. 7.8 ppb (7) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 31, 2020, midnight 9.7 ppb (9) 1.4 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 9.0
 
March 30, 2020, 11 p.m. 10.8 ppb (10) 2.5 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 10.0
 
March 30, 2020, 10 p.m. 8.3 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 (4) 8.0
 
March 30, 2020, 9 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 1.0 μg/m3 (4) 7.0
 
March 30, 2020, 8 p.m. 6.4 ppb (6) 1.6 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
 
March 30, 2020, 7 p.m. 8.6 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 30, 2020, 6 p.m. 7.9 ppb (7) 2.3 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
March 30, 2020, 5 p.m. 9.6 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 9.0
 
March 30, 2020, 4 p.m. 9.2 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
 
March 30, 2020, 3 p.m. 17.2 ppb (16) 8.3 ppb (8) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 30, 2020, 2 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
 
March 30, 2020, 1 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
 
March 30, 2020, noon 16.9 ppb (16) 5.8 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 30, 2020, 11 a.m. 27.5 ppb (25) 7.3 ppb (7) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
March 30, 2020, 10 a.m. 21.4 ppb (20) 5.2 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 30, 2020, 9 a.m. 8.3 ppb (8) 1.5 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
 
March 30, 2020, 8 a.m. 8.3 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
 
March 30, 2020, 7 a.m. 6.9 ppb (6) 1.1 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 30, 2020, 6 a.m. 5.9 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 30, 2020, 5 a.m. 7.6 ppb (7) 1.1 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
 
March 30, 2020, 4 a.m. 9.0 ppb (8) 1.2 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 30, 2020, 3 a.m. 9.5 ppb (9) 0.8 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 30, 2020, 2 a.m. 10.1 ppb (9) 1.6 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
March 30, 2020, 1 a.m. 11.4 ppb (11) 3.1 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
 
March 30, 2020, midnight 10.8 ppb (10) 1.9 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 29, 2020, 11 p.m. 12.2 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 29, 2020, 10 p.m. 10.3 ppb (10) 2.5 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 29, 2020, 9 p.m. 10.0 ppb (9) 2.5 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 29, 2020, 8 p.m. 14.0 ppb (13) 4.2 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 29, 2020, 7 p.m. 12.8 ppb (12) 3.2 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 29, 2020, 6 p.m. 9.8 ppb (9) 2.6 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 29, 2020, 5 p.m. 8.5 ppb (8) 2.6 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
 
March 29, 2020, 4 p.m. 12.7 ppb (12) 3.6 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 29, 2020, 3 p.m. 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 29, 2020, 2 p.m. 11.7 ppb (11) 3.0 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
 
March 29, 2020, 1 p.m. 10.8 ppb (10) 2.3 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 29, 2020, noon 8.5 ppb (8) 1.2 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 29, 2020, 11 a.m. 9.4 ppb (9) 2.4 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 29, 2020, 10 a.m. 6.6 ppb (6) 0.6 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
 
March 29, 2020, 9 a.m. 5.1 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 29, 2020, 8 a.m. 5.4 ppb (5) 0.8 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
 
March 29, 2020, 7 a.m. 4.7 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
 
March 29, 2020, 6 a.m. 4.7 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 29, 2020, 5 a.m. 7.5 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 29, 2020, 4 a.m. 9.6 ppb (9) 0.7 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 29, 2020, 3 a.m. 9.4 ppb (9) 1.4 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 29, 2020, 2 a.m. 10.6 ppb (10) 1.9 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 29, 2020, 1 a.m. 9.7 ppb (9) 2.0 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
 
March 29, 2020, midnight 8.9 ppb (8) 1.2 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0