ID: 472

AQSQID: 245100040

Site Name: Oldtown

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

Updated: Sept. 19, 2021, 10:57 p.m.

Location: Baltimore (Old Town), MD

Reporting: True, Located: True

Current AQI: 8.0

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
Sept. 19, 2021, 9 p.m. 7.7 ppb (8) 2.7 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
 
Sept. 19, 2021, 8 p.m. 6.3 ppb (6) 2.0 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
 
Sept. 19, 2021, 7 p.m. 5.1 ppb (5) 1.5 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
 
Sept. 19, 2021, 6 p.m. 4.9 ppb (5) 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
 
Sept. 19, 2021, 5 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
 
Sept. 19, 2021, 4 p.m. 3.8 ppb (4) 1.3 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
 
Sept. 19, 2021, 3 p.m. 5.1 ppb (5) 2.3 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 19, 2021, 2 p.m. 5.6 ppb (6) 2.3 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2021, 1 p.m. 3.9 ppb (4) 1.1 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. 19, 2021, noon 4.5 ppb (5) 1.5 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. 19, 2021, 11 a.m. 5.4 ppb (6) 0.7 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
 
Sept. 19, 2021, 10 a.m. 4.7 ppb (5) 0.5 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
 
Sept. 19, 2021, 9 a.m. 4.2 ppb (4) 0.2 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
 
Sept. 19, 2021, 8 a.m. 5.0 ppb (5) 0.2 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 19, 2021, 7 a.m. 9.2 ppb (9) 0.7 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 19, 2021, 6 a.m. 8.2 ppb (8) 0.4 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 19, 2021, 5 a.m. 14.9 ppb (15) 1.6 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2021, 4 a.m. 22.8 ppb (22) 3.5 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 19, 2021, 3 a.m. 38.8 ppb (37) 13.9 ppb (14) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 19, 2021, 2 a.m. 24.6 ppb (24) 3.0 ppb (3) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 19, 2021, 1 a.m. 27.3 ppb (26) 3.3 ppb (4) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Sept. 19, 2021, midnight 21.6 ppb (21) 0.8 ppb (1) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
Sept. 18, 2021, 11 p.m. 13.2 ppb (13) 0.6 ppb (1) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2021, 10 p.m. 8.8 ppb (9) 1.4 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
 
Sept. 18, 2021, 9 p.m. 13.2 ppb (13) 1.2 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2021, 8 p.m. 13.7 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2021, 7 p.m. 5.5 ppb (6) 1.2 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 18, 2021, 6 p.m. 4.9 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
 
Sept. 18, 2021, 5 p.m. 9.5 ppb (9) 2.7 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 18, 2021, 4 p.m. 13.5 ppb (13) 4.1 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2021, 3 p.m. 20.6 ppb (20) 6.3 ppb (6) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 18, 2021, 2 p.m. 15.9 ppb (15) 5.1 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 18, 2021, 1 p.m. 15.8 ppb (15) 6.1 ppb (6) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2021, noon 10.8 ppb (11) 2.8 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, 11 a.m. 8.8 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2021, 10 a.m. 10.6 ppb (10) 1.9 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2021, 9 a.m. 7.5 ppb (8) 0.7 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2021, 8 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 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2021, 7 a.m. 12.5 ppb (12) 1.6 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2021, 6 a.m. 10.0 ppb (10) 0.9 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, 5 a.m. 10.3 ppb (10) 0.3 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 18, 2021, 4 a.m. 8.8 ppb (9) 0.7 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
 
Sept. 18, 2021, 3 a.m. 9.5 ppb (9) 0.6 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2021, 2 a.m. 13.3 ppb (13) 2.3 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2021, 1 a.m. 13.6 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, midnight 16.3 ppb (16) 3.5 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
 
Sept. 17, 2021, 11 p.m. 11.4 ppb (11) 2.5 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 17, 2021, 10 p.m. 12.6 ppb (12) 3.9 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Sept. 17, 2021, 9 p.m. 12.0 ppb (12) 3.5 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Sept. 17, 2021, 8 p.m. 11.0 ppb (11) 3.5 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
 
Sept. 17, 2021, 7 p.m. 12.1 ppb (12) 3.6 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
 
Sept. 17, 2021, 6 p.m. 9.7 ppb (10) 3.6 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. 17, 2021, 5 p.m. 9.7 ppb (10) 3.7 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 17, 2021, 4 p.m. 11.1 ppb (11) 4.6 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 17, 2021, 3 p.m. 13.5 ppb (13) 5.1 ppb (5) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 17, 2021, 2 p.m. 11.2 ppb (11) 4.4 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 17, 2021, 1 p.m. 16.8 ppb (16) 6.5 ppb (7) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2021, noon 16.8 ppb (16) 6.3 ppb (6) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2021, 11 a.m. 15.6 ppb (15) 5.3 ppb (5) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2021, 10 a.m. 10.3 ppb (10) 2.5 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 17, 2021, 9 a.m. 8.5 ppb (9) 2.1 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, 2021, 8 a.m. 6.6 ppb (7) 1.6 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, 2021, 7 a.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
 
Sept. 17, 2021, 6 a.m. 7.2 ppb (7) 1.1 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, 2021, 5 a.m. 7.2 ppb (7) 1.2 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
 
Sept. 17, 2021, 4 a.m. 8.7 ppb (9) 1.8 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
 
Sept. 17, 2021, 3 a.m. 10.3 ppb (10) 2.0 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
 
Sept. 17, 2021, 2 a.m. 9.4 ppb (9) 2.2 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2021, 1 a.m. 8.1 ppb (8) 2.2 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. 17, 2021, midnight 11.1 ppb (11) 2.6 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
 
Sept. 16, 2021, 11 p.m. 11.7 ppb (12) 2.5 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 16, 2021, 10 p.m. 11.3 ppb (11) 3.3 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 16, 2021, 9 p.m. 11.6 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 16, 2021, 8 p.m. 11.7 ppb (12) 2.4 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 16, 2021, 7 p.m. 12.6 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 16, 2021, 6 p.m. 10.7 ppb (11) 3.4 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 16, 2021, 5 p.m. 10.3 ppb (10) 2.8 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 16, 2021, 4 p.m. 10.8 ppb (11) 3.3 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 16, 2021, 3 p.m. 12.7 ppb (12) 4.1 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 16, 2021, 2 p.m. 13.5 ppb (13) 4.7 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
 
Sept. 16, 2021, 1 p.m. 16.2 ppb (16) 6.9 ppb (7) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2021, noon 19.4 ppb (19) 7.8 ppb (8) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2021, 11 a.m. 16.2 ppb (16) 5.0 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 16, 2021, 10 a.m. 11.1 ppb (11) 3.4 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
 
Sept. 16, 2021, 9 a.m. 7.8 ppb (8) 2.5 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
 
Sept. 16, 2021, 8 a.m. 5.2 ppb (5) 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
 
Sept. 16, 2021, 7 a.m. 5.5 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 16, 2021, 6 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
 
Sept. 16, 2021, 5 a.m. 5.7 ppb (6) 0.4 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. 16, 2021, 4 a.m. 6.4 ppb (7) 0.5 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Sept. 16, 2021, 3 a.m. 8.6 ppb (9) 1.6 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2021, 2 a.m. 6.5 ppb (7) 0.9 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
 
Sept. 16, 2021, 1 a.m. 10.9 ppb (11) 1.1 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 16, 2021, midnight 14.4 ppb (14) 2.1 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 15, 2021, 11 p.m. 12.4 ppb (12) 1.6 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 15, 2021, 10 p.m. 9.9 ppb (10) 1.8 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 15, 2021, 9 p.m. 8.2 ppb (8) 1.6 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 15, 2021, 8 p.m. 7.7 ppb (8) 1.4 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. 15, 2021, 7 p.m. 9.8 ppb (10) 2.1 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 15, 2021, 6 p.m. 9.9 ppb (10) 2.3 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 15, 2021, 5 p.m. 8.0 ppb (8) 1.3 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
Sept. 15, 2021, 4 p.m. 9.6 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Sept. 15, 2021, 3 p.m. 19.2 ppb (19) 4.6 ppb (5) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 15, 2021, 2 p.m. 17.8 ppb (17) 4.9 ppb (5) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 15, 2021, 1 p.m. 21.1 ppb (20) 6.5 ppb (7) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 15, 2021, noon 25.3 ppb (24) 7.9 ppb (8) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 15, 2021, 11 a.m. 27.3 ppb (26) 6.6 ppb (7) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 15, 2021, 10 a.m. 20.9 ppb (20) 2.8 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
Sept. 15, 2021, 9 a.m. 13.7 ppb (13) 2.2 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 15, 2021, 8 a.m. 9.8 ppb (10) 0.9 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Sept. 15, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 15, 2021, 6 a.m. 9.5 ppb (9) 1.2 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 15, 2021, 5 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
Sept. 15, 2021, 4 a.m. 6.0 ppb (6) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 15, 2021, 3 a.m. 9.1 ppb (9) 0.8 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 15, 2021, 2 a.m. 10.0 ppb (10) 0.7 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 15, 2021, 1 a.m. 12.6 ppb (12) 1.2 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 15, 2021, midnight 12.0 ppb (12) 1.6 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
Sept. 14, 2021, 11 p.m. 11.5 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Sept. 14, 2021, 10 p.m. 10.2 ppb (10) 1.6 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Sept. 14, 2021, 9 p.m. 13.5 ppb (13) 2.4 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 14, 2021, 8 p.m. 10.8 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Sept. 14, 2021, 7 p.m. 12.6 ppb (12) 3.1 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 14, 2021, 6 p.m. 13.5 ppb (13) 2.5 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A N/A 13.0
 
Sept. 14, 2021, 5 p.m. 10.9 ppb (11) 2.1 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A N/A 11.0
 
Sept. 14, 2021, 4 p.m. 19.8 ppb (19) 4.3 ppb (5) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 14, 2021, 3 p.m. 39.4 ppb (38) 11.0 ppb (11) N/A 28.0 ppb (27) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 14, 2021, 2 p.m. 26.8 ppb (26) 6.5 ppb (7) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Sept. 14, 2021, 1 p.m. 27.9 ppb (27) 8.7 ppb (9) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Sept. 14, 2021, noon 47.3 ppb (45) 22.3 ppb (22) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 20.0 μg/m3 (68) 68.0
 
Sept. 14, 2021, 11 a.m. 55.7 ppb (53) 33.8 ppb (32) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 20.0 μg/m3 (68) 68.0
 
Sept. 14, 2021, 10 a.m. 35.9 ppb (34) 14.5 ppb (14) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 26.0 μg/m3 (81) 81.0
 
Sept. 14, 2021, 9 a.m. 39.4 ppb (38) 16.4 ppb (16) N/A 23.0 ppb (22) N/A N/A N/A N/A N/A 32.0 μg/m3 (93) 93.0
 
Sept. 14, 2021, 8 a.m. 28.7 ppb (28) 7.8 ppb (8) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 14, 2021, 7 a.m. 32.5 ppb (31) 8.4 ppb (8) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Sept. 14, 2021, 6 a.m. 27.7 ppb (27) 2.4 ppb (3) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 19.0 μg/m3 (66) 66.0
 
Sept. 14, 2021, 5 a.m. 34.7 ppb (33) 4.4 ppb (5) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
Sept. 14, 2021, 4 a.m. 32.5 ppb (31) 4.8 ppb (5) N/A 28.0 ppb (27) N/A N/A N/A N/A N/A 20.0 μg/m3 (68) 68.0
 
Sept. 14, 2021, 3 a.m. 19.5 ppb (19) 0.6 ppb (1) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 14, 2021, 2 a.m. 18.7 ppb (18) 1.0 ppb (1) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Sept. 14, 2021, 1 a.m. 19.9 ppb (19) 0.4 ppb (1) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 17.0 μg/m3 (62) 62.0
 
Sept. 14, 2021, midnight 13.0 ppb (13) 0.5 ppb (1) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 13, 2021, 11 p.m. 7.8 ppb (8) 0.4 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 18.0 μg/m3 (64) 64.0
 
Sept. 13, 2021, 10 p.m. 7.9 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 13, 2021, 9 p.m. 4.9 ppb (5) 0.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Sept. 13, 2021, 8 p.m. 4.6 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
 
Sept. 13, 2021, 7 p.m. 5.5 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 58.0
 
Sept. 13, 2021, 6 p.m. 5.4 ppb (6) 1.0 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
 
Sept. 13, 2021, 5 p.m. 5.6 ppb (6) 1.1 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
Sept. 13, 2021, 4 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. 13, 2021, 3 p.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
 
Sept. 13, 2021, 2 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 9.0 μg/m3 (38) 38.0
 
Sept. 13, 2021, 1 p.m. 13.5 ppb (13) 3.5 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 13, 2021, noon 19.7 ppb (19) 4.1 ppb (4) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 13, 2021, 11 a.m. 22.0 ppb (21) 3.4 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 13, 2021, 10 a.m. 18.9 ppb (18) 3.2 ppb (4) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 18.0
 
Sept. 13, 2021, 9 a.m. 10.2 ppb (10) 1.4 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Sept. 13, 2021, 8 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 7.0 μg/m3 (30) 30.0
 
Sept. 13, 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
 
Sept. 13, 2021, 6 a.m. 8.2 ppb (8) 0.2 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 60.0
 
Sept. 13, 2021, 5 a.m. 10.1 ppb (10) 0.5 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 13, 2021, 4 a.m. 10.9 ppb (11) 0.2 ppb (1) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Sept. 13, 2021, 3 a.m. 18.3 ppb (18) 3.6 ppb (4) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 13, 2021, 2 a.m. 18.2 ppb (18) 3.6 ppb (4) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 13, 2021, 1 a.m. 15.4 ppb (15) 1.6 ppb (2) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 13, 2021, midnight 15.5 ppb (15) 2.9 ppb (3) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 12, 2021, 11 p.m. 12.9 ppb (13) 1.7 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 12, 2021, 10 p.m. 10.4 ppb (10) 1.2 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