ID: 1384

AQSQID: 240230002

Site Name: Piney Run

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

Updated: Aug. 1, 2021, 4:55 a.m.

Location: Frostburg (Piney Run Rd), MD

Reporting: True, Located: True

Current AQI: 23.0

Frostburg (Piney Run Rd) MD, US: 39.705799, -79.011902

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
July 25, 2021, 3 a.m. N/A N/A 2.9 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 30.0 ppb (28) 0.22 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
July 25, 2021, 2 a.m. N/A N/A 2.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (30) 0.21 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 25, 2021, 1 a.m. N/A N/A 2.4 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (28) 0.2 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 25, 2021, midnight N/A N/A 2.1 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (31) 0.19 ppb (3) N/A 7.0 μg/m3 (30) 31.0
 
July 24, 2021, 11 p.m. N/A N/A 2.2 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 42.0 ppb (39) 0.19 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 24, 2021, 10 p.m. N/A N/A 1.8 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.17 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 24, 2021, 9 p.m. N/A N/A 1.6 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 49.0 ppb (46) 0.16 ppb (3) N/A 10.0 μg/m3 (42) 46.0
 
July 24, 2021, 8 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 50.0 ppb (47) 0.15 ppb (2) N/A 17.0 μg/m3 (62) 62.0
 
July 24, 2021, 7 p.m. N/A N/A 1.8 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 45.0
 
July 24, 2021, 6 p.m. N/A N/A 2.0 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 45.0
 
July 24, 2021, 5 p.m. N/A N/A 1.7 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 52.0 ppb (49) 0.15 ppb (2) N/A 8.0 μg/m3 (34) 49.0
 
July 24, 2021, 4 p.m. N/A N/A 1.4 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 53.0 ppb (50) 0.14 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
July 24, 2021, 3 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.13 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
July 24, 2021, 2 p.m. N/A N/A 1.7 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (40) 0.12 ppb (2) N/A 9.0 μg/m3 (38) 40.0
 
July 24, 2021, 1 p.m. N/A N/A 1.9 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 41.0 ppb (38) 0.13 ppb (2) N/A 8.0 μg/m3 (34) 38.0
 
July 24, 2021, noon N/A N/A 2.1 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 21.0 ppb (20) 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 24, 2021, 11 a.m. N/A N/A 1.9 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 5.0 ppb (5) 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 24, 2021, 10 a.m. N/A N/A 1.9 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 4.0 ppb (4) 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 24, 2021, 9 a.m. N/A N/A 1.7 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 2.0 ppb (2) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 24, 2021, 8 a.m. N/A N/A 1.9 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 5.0 ppb (5) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
July 24, 2021, 7 a.m. N/A N/A 1.9 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 8.0 ppb (8) 0.14 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 24, 2021, 6 a.m. N/A N/A 2.1 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 6.0 ppb (6) 0.13 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 24, 2021, 5 a.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 7.0 ppb (7) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 24, 2021, 4 a.m. N/A N/A 1.8 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 9.0 ppb (9) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 24, 2021, 3 a.m. N/A N/A 1.7 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 14.0 ppb (13) 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 24, 2021, 2 a.m. N/A N/A 1.6 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 21.0 ppb (20) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 24, 2021, 1 a.m. N/A N/A 1.5 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (28) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 24, 2021, midnight N/A N/A 1.6 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (41) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 41.0
 
July 23, 2021, 11 p.m. N/A N/A 1.2 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (40) 0.11 ppb (2) N/A 4.0 μg/m3 (17) 40.0
 
July 23, 2021, 10 p.m. N/A N/A 1.3 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (44) 0.11 ppb (2) N/A 4.0 μg/m3 (17) 44.0
 
July 23, 2021, 9 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.1 ppb (2) N/A 4.0 μg/m3 (17) 45.0
 
July 23, 2021, 8 p.m. N/A N/A 1.7 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 50.0 ppb (47) 0.1 ppb (2) N/A 5.0 μg/m3 (21) 47.0
 
July 23, 2021, 7 p.m. N/A N/A 1.9 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 52.0 ppb (49) 0.1 ppb (2) N/A 6.0 μg/m3 (25) 49.0
 
July 23, 2021, 6 p.m. N/A N/A 1.9 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 53.0 ppb (50) 0.1 ppb (2) N/A 6.0 μg/m3 (25) 50.0
 
July 23, 2021, 5 p.m. N/A N/A 1.7 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 53.0 ppb (50) 0.1 ppb (2) N/A 4.0 μg/m3 (17) 50.0
 
July 23, 2021, 4 p.m. N/A N/A 2.2 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 50.0 ppb (47) 0.1 ppb (2) N/A 5.0 μg/m3 (21) 47.0
 
July 23, 2021, 3 p.m. N/A N/A 2.0 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.1 ppb (2) N/A 9.0 μg/m3 (38) 45.0
 
July 23, 2021, 2 p.m. N/A N/A 2.2 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 46.0 ppb (43) 0.1 ppb (2) N/A 7.0 μg/m3 (30) 43.0
 
July 23, 2021, 1 p.m. N/A N/A 4.2 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (30) 0.11 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 23, 2021, noon N/A N/A 3.6 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 5.0 ppb (5) 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 23, 2021, 11 a.m. N/A N/A 2.3 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 2.0 ppb (2) 0.12 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 23, 2021, 10 a.m. N/A N/A 2.6 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 2.0 ppb (2) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 23, 2021, 9 a.m. N/A N/A 3.1 ppb (3) 3.0 ppb (3) N/A N/A 4.0 ppb (4) 0.13 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 23, 2021, 8 a.m. N/A N/A 3.3 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 5.0 ppb (5) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 23, 2021, 7 a.m. N/A N/A 3.4 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 5.0 ppb (5) 0.14 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 23, 2021, 6 a.m. N/A N/A 3.2 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 7.0 ppb (7) 0.15 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 23, 2021, 5 a.m. N/A N/A 2.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 12.0 ppb (12) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 23, 2021, 4 a.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 15.0 ppb (14) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 23, 2021, 3 a.m. N/A N/A 1.9 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 22.0 ppb (21) 0.14 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 23, 2021, 2 a.m. N/A N/A 2.1 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 27.0 ppb (25) 0.14 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 23, 2021, 1 a.m. N/A N/A 2.1 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 42.0 ppb (39) 0.15 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 23, 2021, midnight N/A N/A 2.1 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.15 ppb (2) N/A 9.0 μg/m3 (38) 45.0
 
July 22, 2021, 11 p.m. N/A N/A 1.9 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (45) 0.13 ppb (2) N/A 8.0 μg/m3 (34) 45.0
 
July 22, 2021, 10 p.m. N/A N/A 2.0 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 51.0 ppb (48) 0.11 ppb (2) N/A 4.0 μg/m3 (17) 48.0
 
July 22, 2021, 9 p.m. N/A N/A 1.7 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 49.0 ppb (46) 0.1 ppb (2) N/A 4.0 μg/m3 (17) 46.0
 
July 22, 2021, 8 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 46.0 ppb (43) 0.1 ppb (2) N/A 4.0 μg/m3 (17) 43.0
 
July 22, 2021, 7 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (44) 0.1 ppb (2) N/A 8.0 μg/m3 (34) 44.0
 
July 22, 2021, 6 p.m. N/A N/A 1.9 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 48.0 ppb (45) 0.1 ppb (2) N/A 9.0 μg/m3 (38) 45.0
 
July 22, 2021, 5 p.m. N/A N/A 4.2 ppb (4) 3.0 ppb (3) N/A 2.0 ppb (3) 45.0 ppb (42) 0.12 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
July 22, 2021, 4 p.m. N/A N/A 2.9 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 43.0 ppb (40) 0.11 ppb (2) N/A 7.0 μg/m3 (30) 40.0
 
July 22, 2021, 3 p.m. N/A N/A 2.4 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 38.0 ppb (36) 0.12 ppb (2) N/A 8.0 μg/m3 (34) 36.0
 
July 22, 2021, 2 p.m. N/A N/A 1.3 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 36.0 ppb (34) 0.11 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 22, 2021, 1 p.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 24.0 ppb (23) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 22, 2021, noon N/A N/A 3.4 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 8.0 ppb (8) 0.2 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 22, 2021, 11 a.m. N/A N/A 2.7 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 4.0 ppb (4) 0.2 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 22, 2021, 10 a.m. N/A N/A 2.6 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 4.0 ppb (4) 0.2 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 22, 2021, 9 a.m. N/A N/A 2.2 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 4.0 ppb (4) 0.21 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 22, 2021, 8 a.m. N/A N/A 2.2 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 7.0 ppb (7) 0.21 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 22, 2021, 7 a.m. N/A N/A 1.7 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 10.0 ppb (10) 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 22, 2021, 6 a.m. N/A N/A N/A 2.0 ppb (2) N/A 0.0 ppb (0) 19.0 ppb (18) 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 22, 2021, 5 a.m. N/A N/A 2.2 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 23.0 ppb (22) 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 22, 2021, 4 a.m. N/A N/A 1.8 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 27.0 ppb (25) 0.24 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 22, 2021, 3 a.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (32) 0.25 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 22, 2021, 2 a.m. N/A N/A 1.8 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (36) 0.26 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
July 22, 2021, 1 a.m. N/A N/A 1.7 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (38) 0.27 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
July 22, 2021, midnight N/A N/A 1.7 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (40) 0.28 ppb (4) N/A 19.0 μg/m3 (66) 66.0
 
July 21, 2021, 11 p.m. N/A N/A 1.8 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 52.0 ppb (49) 0.29 ppb (4) N/A 21.0 μg/m3 (70) 70.0
 
July 21, 2021, 10 p.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 56.0 ppb (55) 0.28 ppb (4) N/A 18.0 μg/m3 (64) 64.0
 
July 21, 2021, 9 p.m. N/A N/A 1.8 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 54.0 ppb (50) 0.25 ppb (3) N/A 26.0 μg/m3 (81) 81.0
 
July 21, 2021, 8 p.m. N/A N/A 1.9 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 53.0 ppb (50) 0.2 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
July 21, 2021, 7 p.m. N/A N/A 1.6 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 51.0 ppb (48) 0.2 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
July 21, 2021, 6 p.m. N/A N/A 1.8 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 51.0 ppb (48) 0.21 ppb (3) N/A 18.0 μg/m3 (64) 64.0
 
July 21, 2021, 5 p.m. N/A N/A 1.8 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 50.0 ppb (47) 0.2 ppb (3) N/A 17.0 μg/m3 (62) 62.0
 
July 21, 2021, 4 p.m. N/A N/A 2.0 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 49.0 ppb (46) 0.2 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
July 21, 2021, 3 p.m. N/A N/A 2.3 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (44) 0.21 ppb (3) N/A 18.0 μg/m3 (64) 64.0
 
July 21, 2021, 2 p.m. N/A N/A 2.2 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (43) 0.22 ppb (3) N/A 24.0 μg/m3 (77) 77.0
 
July 21, 2021, 1 p.m. N/A N/A N/A 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (38) 0.23 ppb (3) N/A 23.0 μg/m3 (74) 74.0
 
July 21, 2021, noon N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (35) 0.29 ppb (4) N/A 29.0 μg/m3 (87) 87.0
 
July 21, 2021, 11 a.m. N/A N/A 2.7 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 28.0 ppb (26) 0.32 ppb (4) N/A 34.0 μg/m3 (98) 98.0
 
July 21, 2021, 10 a.m. N/A N/A 3.8 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 25.0 ppb (24) 0.34 ppb (4) N/A 39.0 μg/m3 (110) 110.0
 
July 21, 2021, 9 a.m. N/A N/A 3.9 ppb (4) 3.0 ppb (3) N/A N/A 26.0 ppb (25) 0.34 ppb (4) N/A 40.0 μg/m3 (113) 113.0
 
July 21, 2021, 8 a.m. N/A N/A 4.5 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 28.0 ppb (26) 0.35 ppb (4) N/A 38.0 μg/m3 (108) 108.0
 
July 21, 2021, 7 a.m. N/A N/A 6.5 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 28.0 ppb (26) 0.35 ppb (4) N/A 38.0 μg/m3 (108) 108.0
 
July 21, 2021, 6 a.m. N/A N/A 3.6 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (30) 0.34 ppb (4) N/A 38.0 μg/m3 (108) 108.0
 
July 21, 2021, 5 a.m. N/A N/A 3.2 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (37) 0.33 ppb (4) N/A 34.0 μg/m3 (98) 98.0
 
July 21, 2021, 4 a.m. N/A N/A 2.9 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (38) 0.35 ppb (4) N/A 43.0 μg/m3 (120) 120.0
 
July 21, 2021, 3 a.m. N/A N/A 3.3 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (31) 0.35 ppb (4) N/A 41.0 μg/m3 (115) 115.0
 
July 21, 2021, 2 a.m. N/A N/A 4.6 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (36) 0.36 ppb (5) N/A 43.0 μg/m3 (120) 120.0
 
July 21, 2021, 1 a.m. N/A N/A 2.4 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (38) 0.35 ppb (4) N/A 45.0 μg/m3 (125) 125.0
 
July 21, 2021, midnight N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (42) 0.34 ppb (4) N/A 45.0 μg/m3 (125) 125.0
 
July 20, 2021, 11 p.m. N/A N/A 1.8 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (41) 0.32 ppb (4) N/A 40.0 μg/m3 (113) 113.0
 
July 20, 2021, 10 p.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (48) 0.32 ppb (4) N/A 39.0 μg/m3 (110) 110.0
 
July 20, 2021, 9 p.m. N/A N/A 1.7 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 51.0 ppb (48) 0.31 ppb (4) N/A 38.0 μg/m3 (108) 108.0
 
July 20, 2021, 8 p.m. N/A N/A 1.8 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 52.0 ppb (49) 0.3 ppb (4) N/A 36.0 μg/m3 (103) 103.0
 
July 20, 2021, 7 p.m. N/A N/A 1.6 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 54.0 ppb (50) 0.28 ppb (4) N/A 35.0 μg/m3 (100) 100.0
 
July 20, 2021, 6 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 52.0 ppb (49) 0.26 ppb (4) N/A 35.0 μg/m3 (100) 100.0
 
July 20, 2021, 5 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (44) 0.25 ppb (3) N/A 32.0 μg/m3 (93) 93.0
 
July 20, 2021, 4 p.m. N/A N/A 1.6 ppb (2) 1.0 ppb (1) N/A N/A 45.0 ppb (42) 0.24 ppb (3) N/A N/A 42.0
 
July 20, 2021, 3 p.m. N/A N/A 2.5 ppb (3) 2.0 ppb (2) N/A N/A 42.0 ppb (39) 0.25 ppb (3) N/A N/A 39.0
 
July 20, 2021, 2 p.m. N/A N/A 1.6 ppb (2) 1.0 ppb (1) N/A N/A 36.0 ppb (34) 0.25 ppb (3) N/A 30.0 μg/m3 (89) 89.0
 
July 20, 2021, 1 p.m. N/A N/A 2.5 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 26.0 ppb (25) 0.25 ppb (3) N/A 24.0 μg/m3 (77) 77.0
 
July 20, 2021, noon N/A N/A 4.4 ppb (5) 3.0 ppb (3) N/A 1.0 ppb (2) 5.0 ppb (5) 0.24 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
July 20, 2021, 11 a.m. N/A N/A 4.2 ppb (4) 2.0 ppb (2) N/A 1.0 ppb (2) 0.0 ppb (0) 0.22 ppb (3) N/A 17.0 μg/m3 (62) 62.0
 
July 20, 2021, 10 a.m. N/A N/A 4.5 ppb (5) 3.0 ppb (3) N/A 1.0 ppb (2) 0.0 ppb (0) 0.23 ppb (3) N/A 23.0 μg/m3 (74) 74.0
 
July 20, 2021, 9 a.m. N/A N/A 3.5 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (2) 0.0 ppb (0) 0.23 ppb (3) N/A 17.0 μg/m3 (62) 62.0
 
July 20, 2021, 8 a.m. N/A N/A 3.2 ppb (4) 3.0 ppb (3) N/A N/A 0.0 ppb (0) 0.24 ppb (3) N/A 20.0 μg/m3 (68) 68.0
 
July 20, 2021, 7 a.m. N/A N/A 3.2 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (2) 1.0 ppb (1) N/A N/A 21.0 μg/m3 (70) 70.0
 
July 20, 2021, 6 a.m. N/A N/A 3.3 ppb (4) N/A N/A 1.0 ppb (2) 2.0 ppb (2) 0.24 ppb (3) N/A 25.0 μg/m3 (79) 79.0
 
July 20, 2021, 5 a.m. N/A N/A 3.4 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (2) 5.0 ppb (5) 0.24 ppb (3) N/A 25.0 μg/m3 (79) 79.0
 
July 20, 2021, 4 a.m. N/A N/A 2.5 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (2) 9.0 ppb (9) 0.24 ppb (3) N/A 23.0 μg/m3 (74) 74.0
 
July 20, 2021, 3 a.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 12.0 ppb (12) 0.25 ppb (3) N/A 23.0 μg/m3 (74) 74.0
 
July 20, 2021, 2 a.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 21.0 ppb (20) 0.25 ppb (3) N/A 25.0 μg/m3 (79) 79.0
 
July 20, 2021, 1 a.m. N/A N/A 2.0 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 32.0 ppb (30) 0.25 ppb (3) N/A 30.0 μg/m3 (89) 89.0
 
July 20, 2021, midnight N/A N/A 2.4 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 46.0 ppb (43) 0.25 ppb (3) N/A 23.0 μg/m3 (74) 74.0
 
July 19, 2021, 11 p.m. N/A N/A 2.4 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 50.0 ppb (47) 0.25 ppb (3) N/A 25.0 μg/m3 (79) 79.0
 
July 19, 2021, 10 p.m. N/A N/A 2.3 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 51.0 ppb (48) 0.26 ppb (4) N/A 28.0 μg/m3 (85) 85.0
 
July 19, 2021, 9 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 46.0 ppb (43) 0.27 ppb (4) N/A 28.0 μg/m3 (85) 85.0
 
July 19, 2021, 8 p.m. N/A N/A 1.5 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 44.0 ppb (41) 0.27 ppb (4) N/A 32.0 μg/m3 (93) 93.0
 
July 19, 2021, 7 p.m. N/A N/A 1.3 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 43.0 ppb (40) 0.25 ppb (3) N/A 29.0 μg/m3 (87) 87.0
 
July 19, 2021, 6 p.m. N/A N/A 1.2 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 40.0 ppb (38) 0.21 ppb (3) N/A 25.0 μg/m3 (79) 79.0
 
July 19, 2021, 5 p.m. N/A N/A 1.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 40.0 ppb (38) 0.21 ppb (3) N/A 21.0 μg/m3 (70) 70.0
 
July 19, 2021, 4 p.m. N/A N/A 1.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 38.0 ppb (36) 0.21 ppb (3) N/A 22.0 μg/m3 (72) 72.0
 
July 19, 2021, 3 p.m. N/A N/A 1.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 33.0 ppb (31) 0.18 ppb (3) N/A 18.0 μg/m3 (64) 64.0
 
July 19, 2021, 2 p.m. N/A N/A 1.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 25.0 ppb (24) 0.16 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
July 19, 2021, 1 p.m. N/A N/A N/A 1.0 ppb (1) N/A 1.0 ppb (2) 19.0 ppb (18) 0.17 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
July 19, 2021, noon N/A N/A N/A 2.0 ppb (2) N/A 1.0 ppb (2) 4.0 ppb (4) 0.19 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 19, 2021, 11 a.m. N/A N/A 2.6 ppb (3) 1.0 ppb (1) N/A 1.0 ppb (2) 0.0 ppb (0) 0.18 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 19, 2021, 10 a.m. N/A N/A 2.1 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 0.0 ppb (0) 0.18 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 19, 2021, 9 a.m. N/A N/A 2.6 ppb (3) 3.0 ppb (3) N/A N/A 3.0 ppb (3) 0.19 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 19, 2021, 8 a.m. N/A N/A 2.4 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 3.0 ppb (3) 0.19 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 19, 2021, 7 a.m. N/A N/A 2.4 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (2) 6.0 ppb (6) 0.19 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 19, 2021, 6 a.m. N/A N/A 1.6 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 9.0 ppb (9) 0.19 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
July 19, 2021, 5 a.m. N/A N/A 1.3 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 7.0 ppb (7) 0.19 ppb (3) N/A 19.0 μg/m3 (66) 66.0
 
July 19, 2021, 4 a.m. N/A N/A 1.5 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 10.0 ppb (10) 0.18 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
July 19, 2021, 3 a.m. N/A N/A 1.4 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 17.0 ppb (16) 0.19 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
July 19, 2021, 2 a.m. N/A N/A 1.4 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 22.0 ppb (21) 0.18 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
July 19, 2021, 1 a.m. N/A N/A 1.3 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 22.0 ppb (21) 0.18 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 19, 2021, midnight N/A N/A 1.2 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (2) 21.0 ppb (20) 0.18 ppb (3) N/A 17.0 μg/m3 (62) 62.0
 
July 18, 2021, 11 p.m. N/A N/A 1.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 25.0 ppb (24) 0.18 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
July 18, 2021, 10 p.m. N/A N/A 1.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 29.0 ppb (27) 0.17 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
July 18, 2021, 9 p.m. N/A N/A 1.2 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 32.0 ppb (30) 0.17 ppb (3) N/A 19.0 μg/m3 (66) 66.0
 
July 18, 2021, 8 p.m. N/A N/A 1.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (2) 31.0 ppb (29) 0.18 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
July 18, 2021, 7 p.m. N/A N/A 1.0 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 29.0 ppb (27) 0.15 ppb (2) N/A 14.0 μg/m3 (55) 55.0
 
July 18, 2021, 6 p.m. N/A N/A 0.9 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 26.0 ppb (25) 0.14 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
July 18, 2021, 5 p.m. N/A N/A 0.9 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 26.0 ppb (25) 0.13 ppb (2) N/A 15.0 μg/m3 (58) 58.0
 
July 18, 2021, 4 p.m. N/A N/A 1.0 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 29.0 ppb (27) 0.14 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
July 18, 2021, 3 p.m. N/A N/A 0.9 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 31.0 ppb (29) 0.14 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 18, 2021, 2 p.m. N/A N/A 0.8 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 36.0 ppb (34) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 34.0
 
July 18, 2021, 1 p.m. N/A N/A 0.8 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 31.0 ppb (29) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 18, 2021, noon N/A N/A 0.8 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 33.0 ppb (31) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 31.0
 
July 18, 2021, 11 a.m. N/A N/A 0.6 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 32.0 ppb (30) 0.14 ppb (2) N/A 0.0 μg/m3 (0) 30.0
 
July 18, 2021, 10 a.m. N/A N/A 0.5 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 34.0 ppb (32) 0.14 ppb (2) N/A 0.0 μg/m3 (0) 32.0
 
July 18, 2021, 9 a.m. N/A N/A 0.7 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 38.0 ppb (36) 0.13 ppb (2) N/A -1.0 μg/m3 (0) 36.0
 
July 18, 2021, 8 a.m. N/A N/A 0.5 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 41.0 ppb (38) 0.13 ppb (2) N/A 2.0 μg/m3 (9) 38.0
 
July 18, 2021, 7 a.m. N/A N/A 0.5 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 40.0 ppb (38) 0.13 ppb (2) N/A 2.0 μg/m3 (9) 38.0
 
July 18, 2021, 6 a.m. N/A N/A 0.6 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 35.0 ppb (33) 0.13 ppb (2) N/A 1.0 μg/m3 (5) 33.0
 
July 18, 2021, 5 a.m. N/A N/A 0.5 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 35.0 ppb (33) 0.13 ppb (2) N/A 1.0 μg/m3 (5) 33.0
 
July 18, 2021, 4 a.m. N/A N/A 0.6 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (2) 33.0 ppb (31) 0.13 ppb (2) N/A 1.0 μg/m3 (5) 31.0