AQSQID: 240330030

Site Name: Hu-Beltsville

Location: Prince George's Co, MD

Reporting: True, Located: True

Current AQI: 35.0

Prince George's Co MD, US: 39.055302, -76.878304

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 24, 2019, 11 p.m. 4.4 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 45.0 ppb (35) 0.1 ppb (1) N/A 3.0 μg/m3 (12) 35.0
 
March 24, 2019, 10 p.m. 2.8 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.12 ppb (1) N/A 0.0 μg/m3 (0) 39.0
 
March 24, 2019, 9 p.m. 2.4 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 54.0 ppb (42) 0.11 ppb (1) N/A -1.0 μg/m3 (0) 42.0
 
March 24, 2019, 8 p.m. 1.9 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 55.0 ppb (42) 0.13 ppb (1) N/A 1.0 μg/m3 (4) 42.0
 
March 24, 2019, 7 p.m. 2.9 ppb (3) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 54.0 ppb (42) 0.12 ppb (1) N/A -1.0 μg/m3 (0) 42.0
 
March 24, 2019, 6 p.m. 4.2 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.14 ppb (2) N/A -1.0 μg/m3 (0) 39.0
 
March 24, 2019, 5 p.m. 4.8 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 49.0 ppb (38) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 38.0
 
March 24, 2019, 4 p.m. 7.4 ppb (7) 1.8 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (35) 0.18 ppb (2) N/A -1.0 μg/m3 (0) 35.0
 
March 24, 2019, 3 p.m. 8.3 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) 0.21 ppb (2) N/A 1.0 μg/m3 (4) 34.0
 
March 24, 2019, 2 p.m. 21.0 ppb (19) 6.5 ppb (6) N/A 15.0 ppb (14) N/A 0.0 ppb (0) 32.0 ppb (25) 0.26 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
March 24, 2019, 1 p.m. 47.9 ppb (44) 21.6 ppb (20) N/A 26.0 ppb (24) N/A 1.0 ppb (1) 14.0 ppb (11) 0.43 ppb (5) N/A 6.0 μg/m3 (25) 44.0
 
March 24, 2019, noon 47.9 ppb (44) 22.1 ppb (20) N/A 26.0 ppb (24) N/A 0.0 ppb (0) 6.0 ppb (5) 0.45 ppb (5) N/A 5.0 μg/m3 (21) 44.0
 
March 24, 2019, 11 a.m. 35.5 ppb (33) 8.5 ppb (8) N/A 27.0 ppb (25) N/A 0.0 ppb (0) 3.0 ppb (2) 0.37 ppb (4) N/A 6.0 μg/m3 (25) 33.0
 
March 24, 2019, 10 a.m. 21.7 ppb (20) 0.4 ppb (0) N/A 21.0 ppb (19) N/A 0.0 ppb (0) 7.0 ppb (5) 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2019, 9 a.m. 21.3 ppb (20) 0.3 ppb (0) N/A 21.0 ppb (19) N/A 0.0 ppb (0) 9.0 ppb (7) 0.28 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2019, 8 a.m. 13.6 ppb (13) 0.2 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 13.0 ppb (10) 0.22 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 7 a.m. 8.0 ppb (7) 0.2 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 21.0 ppb (16) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 6 a.m. 5.0 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 27.0 ppb (21) 0.11 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2019, 5 a.m. 5.1 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 26.0 ppb (20) 0.12 ppb (1) N/A 3.0 μg/m3 (12) 20.0
 
March 24, 2019, 4 a.m. 5.1 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 21.0 ppb (16) 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
March 24, 2019, 3 a.m. 5.1 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 26.0 ppb (20) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 20.0
 
March 24, 2019, 2 a.m. 5.9 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 31.0 ppb (24) 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 1 a.m. 4.7 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.15 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2019, midnight 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.15 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 11 p.m. 2.6 ppb (2) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) 0.17 ppb (2) N/A 1.0 μg/m3 (4) 32.0
 
March 23, 2019, 10 p.m. 2.2 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 34.0
 
March 23, 2019, 9 p.m. 1.8 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 35.0
 
March 23, 2019, 8 p.m. 1.6 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 46.0 ppb (35) 0.18 ppb (2) N/A 2.0 μg/m3 (8) 35.0
 
March 23, 2019, 7 p.m. 1.8 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) 0.16 ppb (2) N/A 1.0 μg/m3 (4) 35.0
 
March 23, 2019, 6 p.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 45.0 ppb (35) 0.17 ppb (2) N/A -2.0 μg/m3 (0) 35.0
 
March 23, 2019, 5 p.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.17 ppb (2) N/A 0.0 μg/m3 (0) 34.0
 
March 23, 2019, 4 p.m. 2.0 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 42.0 ppb (32) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 32.0
 
March 23, 2019, 3 p.m. 2.2 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (32) 0.15 ppb (2) N/A 4.0 μg/m3 (17) 32.0
 
March 23, 2019, 2 p.m. 2.5 ppb (2) 0.7 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (29) 0.14 ppb (2) N/A 3.0 μg/m3 (12) 29.0
 
March 23, 2019, 1 p.m. 2.5 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) 0.14 ppb (2) N/A 3.0 μg/m3 (12) 27.0
 
March 23, 2019, noon 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
March 23, 2019, 11 a.m. 2.5 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) 0.12 ppb (1) N/A 3.0 μg/m3 (12) 26.0
 
March 23, 2019, 10 a.m. 1.8 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) 0.13 ppb (1) N/A 1.0 μg/m3 (4) 26.0
 
March 23, 2019, 9 a.m. 1.2 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) 0.13 ppb (1) N/A 2.0 μg/m3 (8) 28.0
 
March 23, 2019, 8 a.m. 1.3 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 37.0 ppb (28) 0.11 ppb (1) N/A 4.0 μg/m3 (17) 28.0
 
March 23, 2019, 7 a.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (29) 0.12 ppb (1) N/A 2.0 μg/m3 (8) 29.0
 
March 23, 2019, 6 a.m. 1.0 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 39.0 ppb (30) 0.12 ppb (1) N/A 1.0 μg/m3 (4) 30.0
 
March 23, 2019, 5 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 41.0 ppb (32) 0.12 ppb (1) N/A 1.0 μg/m3 (4) 32.0
 
March 23, 2019, 4 a.m. 1.1 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 41.0 ppb (32) 0.13 ppb (1) N/A 1.0 μg/m3 (4) 32.0
 
March 23, 2019, 3 a.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 39.0 ppb (30) 0.11 ppb (1) N/A 2.0 μg/m3 (8) 30.0
 
March 23, 2019, 2 a.m. 1.8 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (29) 0.12 ppb (1) N/A 3.0 μg/m3 (12) 29.0
 
March 23, 2019, 1 a.m. 1.5 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 40.0 ppb (31) 0.12 ppb (1) N/A 3.0 μg/m3 (12) 31.0
 
March 23, 2019, midnight 1.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 40.0 ppb (31) 0.12 ppb (1) N/A 1.0 μg/m3 (4) 31.0
 
March 22, 2019, 11 p.m. 2.0 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (31) 0.11 ppb (1) N/A 3.0 μg/m3 (12) 31.0
 
March 22, 2019, 10 p.m. 2.7 ppb (3) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 39.0 ppb (30) 0.14 ppb (2) N/A 3.0 μg/m3 (12) 30.0
 
March 22, 2019, 9 p.m. 4.3 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 37.0 ppb (28) 0.16 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
March 22, 2019, 8 p.m. 4.4 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 29.0
 
March 22, 2019, 7 p.m. 3.6 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) 0.19 ppb (2) N/A 4.0 μg/m3 (17) 32.0
 
March 22, 2019, 6 p.m. 2.7 ppb (3) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) 0.19 ppb (2) N/A 3.0 μg/m3 (12) 34.0
 
March 22, 2019, 5 p.m. 2.8 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) 0.18 ppb (2) N/A 4.0 μg/m3 (17) 34.0
 
March 22, 2019, 4 p.m. 3.1 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.16 ppb (2) N/A 3.0 μg/m3 (12) 33.0
 
March 22, 2019, 3 p.m. 2.9 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) 0.17 ppb (2) N/A 5.0 μg/m3 (21) 33.0
 
March 22, 2019, 2 p.m. 4.8 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (31) 0.17 ppb (2) N/A 6.0 μg/m3 (25) 31.0
 
March 22, 2019, 1 p.m. 3.4 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.15 ppb (2) N/A 7.0 μg/m3 (29) 33.0
 
March 22, 2019, noon 4.7 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (31) 0.17 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 11 a.m. 4.5 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (31) 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 10 a.m. 4.6 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 7.0 μg/m3 (29) 30.0
 
March 22, 2019, 9 a.m. 3.2 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) 0.16 ppb (2) N/A 6.0 μg/m3 (25) 31.0
 
March 22, 2019, 7 a.m. 2.5 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (32) 0.13 ppb (1) N/A 3.0 μg/m3 (12) 32.0
 
March 22, 2019, 6 a.m. 2.4 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 39.0 ppb (30) 0.12 ppb (1) N/A -2.0 μg/m3 (0) 30.0
 
March 22, 2019, 5 a.m. 2.6 ppb (2) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (28) 0.13 ppb (1) N/A 0.0 μg/m3 (0) 28.0
 
March 22, 2019, 4 a.m. 3.0 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 36.0 ppb (28) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 28.0
 
March 22, 2019, 3 a.m. 3.5 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 36.0 ppb (28) 0.34 ppb (4) N/A 2.0 μg/m3 (8) 28.0
 
March 22, 2019, 2 a.m. 4.6 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 33.0 ppb (25) 0.33 ppb (4) N/A 0.0 μg/m3 (0) 25.0
 
March 22, 2019, 1 a.m. 5.8 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 31.0 ppb (24) 0.33 ppb (4) N/A -2.0 μg/m3 (0) 24.0
 
March 22, 2019, midnight 6.4 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (23) 0.35 ppb (4) N/A 1.0 μg/m3 (4) 23.0
 
March 21, 2019, 11 p.m. 9.6 ppb (9) 0.2 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 26.0 ppb (20) 0.35 ppb (4) N/A -1.0 μg/m3 (0) 20.0
 
March 21, 2019, 10 p.m. 10.6 ppb (10) 0.2 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 24.0 ppb (18) 0.37 ppb (4) N/A 0.0 μg/m3 (0) 18.0
 
March 21, 2019, 9 p.m. 10.9 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 25.0 ppb (19) 0.39 ppb (4) N/A 3.0 μg/m3 (12) 19.0
 
March 21, 2019, 8 p.m. 15.0 ppb (14) 0.7 ppb (1) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 26.0 ppb (20) 0.39 ppb (4) N/A 3.0 μg/m3 (12) 20.0
 
March 21, 2019, 7 p.m. 13.8 ppb (13) 1.2 ppb (1) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 24.0 ppb (18) 0.38 ppb (4) N/A 4.0 μg/m3 (17) 18.0
 
March 21, 2019, 6 p.m. 12.1 ppb (11) 1.3 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 26.0 ppb (20) 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 5 p.m. 9.6 ppb (9) 1.3 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 28.0 ppb (22) 0.36 ppb (4) N/A 4.0 μg/m3 (17) 22.0
 
March 21, 2019, 4 p.m. 9.2 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A 27.0 ppb (21) 0.33 ppb (4) N/A 0.0 μg/m3 (0) 21.0
 
March 21, 2019, 3 p.m. 10.1 ppb (9) 0.6 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.33 ppb (4) N/A 1.0 μg/m3 (4) 9.0
 
March 21, 2019, 2 p.m. 12.2 ppb (11) 0.6 ppb (1) N/A 12.0 ppb (11) N/A N/A 23.0 ppb (18) 0.35 ppb (4) N/A 3.0 μg/m3 (12) 18.0
 
March 21, 2019, 1 p.m. 14.5 ppb (13) 0.6 ppb (1) N/A 14.0 ppb (13) N/A N/A 22.0 ppb (17) 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, noon 15.4 ppb (14) 0.4 ppb (0) N/A 15.0 ppb (14) N/A 0.0 ppb (0) 21.0 ppb (16) 0.35 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
March 21, 2019, 11 a.m. 14.5 ppb (13) 0.2 ppb (0) N/A 14.0 ppb (13) N/A N/A 23.0 ppb (18) 0.34 ppb (4) N/A 4.0 μg/m3 (17) 18.0
 
March 21, 2019, 10 a.m. 13.3 ppb (12) 0.1 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 24.0 ppb (18) 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2019, 9 a.m. 11.0 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 28.0 ppb (22) 0.31 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 8 a.m. 7.5 ppb (7) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (25) 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 7 a.m. 5.0 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.31 ppb (3) N/A 5.0 μg/m3 (21) 27.0
 
March 21, 2019, 6 a.m. 4.3 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 32.0 ppb (25) 0.29 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
March 21, 2019, 5 a.m. 4.3 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 31.0 ppb (24) 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 4 a.m. 5.7 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 31.0 ppb (24) 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 3 a.m. 5.8 ppb (5) 0.2 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.13 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 2 a.m. 5.7 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) 0.12 ppb (1) N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 1 a.m. 5.9 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 42.0 ppb (32) 0.16 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 21, 2019, midnight 3.3 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) 0.12 ppb (1) N/A 5.0 μg/m3 (21) 37.0
 
March 20, 2019, 11 p.m. 2.6 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.13 ppb (1) N/A 6.0 μg/m3 (25) 39.0
 
March 20, 2019, 10 p.m. 2.6 ppb (2) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 53.0 ppb (41) 0.14 ppb (2) N/A 7.0 μg/m3 (29) 41.0
 
March 20, 2019, 9 p.m. 2.8 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 54.0 ppb (42) 0.13 ppb (1) N/A 6.0 μg/m3 (25) 42.0
 
March 20, 2019, 8 p.m. 2.8 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 54.0 ppb (42) 0.15 ppb (2) N/A 6.0 μg/m3 (25) 42.0
 
March 20, 2019, 7 p.m. 2.7 ppb (3) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 54.0 ppb (42) 0.15 ppb (2) N/A 3.0 μg/m3 (12) 42.0
 
March 20, 2019, 6 p.m. 2.4 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 53.0 ppb (41) 0.11 ppb (1) N/A 4.0 μg/m3 (17) 41.0
 
March 20, 2019, 5 p.m. 2.9 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 52.0 ppb (40) 0.1 ppb (1) N/A N/A 40.0
 
March 20, 2019, 4 p.m. 4.6 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 49.0 ppb (38) 0.13 ppb (1) N/A 7.0 μg/m3 (29) 38.0
 
March 20, 2019, 3 p.m. 9.5 ppb (9) 1.7 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 44.0 ppb (34) 0.15 ppb (2) N/A 8.0 μg/m3 (33) 34.0
 
March 20, 2019, 2 p.m. 17.7 ppb (16) 3.6 ppb (3) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 37.0 ppb (28) 0.22 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 1 p.m. 50.2 ppb (46) 19.2 ppb (18) N/A 31.0 ppb (29) N/A 0.0 ppb (0) 15.0 ppb (12) 0.37 ppb (4) N/A 10.0 μg/m3 (42) 46.0
 
March 20, 2019, noon 45.4 ppb (42) 18.5 ppb (17) N/A 27.0 ppb (25) N/A 0.0 ppb (0) 7.0 ppb (5) 0.39 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 11 a.m. 20.6 ppb (19) 1.6 ppb (1) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 10.0 ppb (8) 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 20, 2019, 10 a.m. 11.1 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 20.0 ppb (15) 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 9 a.m. 11.1 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 19.0 ppb (15) 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 8 a.m. 9.3 ppb (9) 0.2 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 23.0 ppb (18) 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 7 a.m. 6.6 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 20, 2019, 6 a.m. 6.0 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.19 ppb (2) N/A 4.0 μg/m3 (17) 21.0
 
March 20, 2019, 5 a.m. 5.9 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 34.0 ppb (26) 0.17 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 4 a.m. 7.5 ppb (7) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 31.0 ppb (24) 0.2 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 3 a.m. 6.4 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.13 ppb (1) N/A 6.0 μg/m3 (25) 27.0
 
March 20, 2019, 2 a.m. 6.7 ppb (6) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.13 ppb (1) N/A 6.0 μg/m3 (25) 27.0
 
March 20, 2019, 1 a.m. 5.3 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) 0.13 ppb (1) N/A 6.0 μg/m3 (25) 29.0
 
March 20, 2019, midnight 3.4 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.11 ppb (1) N/A 7.0 μg/m3 (29) 34.0
 
March 19, 2019, 11 p.m. 2.7 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.1 ppb (1) N/A 5.0 μg/m3 (21) 36.0
 
March 19, 2019, 10 p.m. 2.9 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.13 ppb (1) N/A 6.0 μg/m3 (25) 39.0
 
March 19, 2019, 9 p.m. 3.5 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (38) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 38.0
 
March 19, 2019, 8 p.m. 3.3 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.15 ppb (2) N/A 7.0 μg/m3 (29) 39.0
 
March 19, 2019, 7 p.m. 2.7 ppb (3) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (39) 0.15 ppb (2) N/A 3.0 μg/m3 (12) 39.0
 
March 19, 2019, 6 p.m. 3.7 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) 0.16 ppb (2) N/A 4.0 μg/m3 (17) 38.0
 
March 19, 2019, 5 p.m. 7.2 ppb (7) 1.7 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 45.0 ppb (35) 0.18 ppb (2) N/A 2.0 μg/m3 (8) 35.0
 
March 19, 2019, 4 p.m. 8.5 ppb (8) 2.1 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 43.0 ppb (33) 0.18 ppb (2) N/A 0.0 μg/m3 (0) 33.0
 
March 19, 2019, 3 p.m. 8.7 ppb (8) 2.1 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 42.0 ppb (32) 0.18 ppb (2) N/A 4.0 μg/m3 (17) 32.0
 
March 19, 2019, 2 p.m. 14.7 ppb (14) 3.8 ppb (4) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 6.0 μg/m3 (25) 29.0
 
March 19, 2019, 1 p.m. 28.1 ppb (26) 8.3 ppb (8) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 26.0 ppb (20) N/A N/A 5.0 μg/m3 (21) 26.0
 
March 19, 2019, noon 30.8 ppb (29) 8.9 ppb (8) N/A 22.0 ppb (20) N/A 0.0 ppb (0) 11.0 ppb (8) N/A N/A 15.0 μg/m3 (56) 56.0
 
March 19, 2019, 11 a.m. 38.4 ppb (36) 7.2 ppb (7) N/A 31.0 ppb (29) N/A 0.0 ppb (0) 3.0 ppb (2) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 10 a.m. 17.7 ppb (16) 0.5 ppb (0) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 18.0 ppb (14) 0.14 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 19, 2019, 9 a.m. 7.4 ppb (7) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.11 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 8 a.m. 8.9 ppb (8) 0.2 ppb (0) N/A 9.0 ppb (8) N/A N/A 25.0 ppb (19) 0.12 ppb (1) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 7 a.m. 7.8 ppb (7) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 21.0 ppb (16) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 6 a.m. 10.8 ppb (10) 0.2 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 20.0 ppb (15) 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 5 a.m. 13.1 ppb (12) 0.2 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 20.0 ppb (15) 0.16 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 4 a.m. 11.1 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 24.0 ppb (18) 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 3 a.m. 8.3 ppb (8) 0.2 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 28.0 ppb (22) 0.16 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 2 a.m. 6.7 ppb (6) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (25) 0.15 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 1 a.m. 5.1 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) 0.13 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, midnight 4.0 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 43.0 ppb (33) 0.11 ppb (1) N/A 7.0 μg/m3 (29) 33.0
 
March 18, 2019, 11 p.m. 3.5 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.1 ppb (1) N/A 6.0 μg/m3 (25) 34.0
 
March 18, 2019, 10 p.m. 4.7 ppb (4) 0.2 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 43.0 ppb (33) 0.12 ppb (1) N/A 7.0 μg/m3 (29) 33.0
 
March 18, 2019, 9 p.m. 5.6 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 42.0 ppb (32) 0.14 ppb (2) N/A 7.0 μg/m3 (29) 32.0
 
March 18, 2019, 8 p.m. 6.3 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 42.0 ppb (32) 0.12 ppb (1) N/A 7.0 μg/m3 (29) 32.0
 
March 18, 2019, 7 p.m. 6.0 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 42.0 ppb (32) 0.14 ppb (2) N/A 7.0 μg/m3 (29) 32.0
 
March 18, 2019, 6 p.m. 4.8 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 44.0 ppb (34) 0.13 ppb (1) N/A 5.0 μg/m3 (21) 34.0
 
March 18, 2019, 5 p.m. 3.2 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) 0.1 ppb (1) N/A 7.0 μg/m3 (29) 35.0
 
March 18, 2019, 4 p.m. 5.1 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.11 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 3 p.m. 5.8 ppb (5) 0.9 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.12 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
March 18, 2019, 2 p.m. 5.3 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.12 ppb (1) N/A N/A 27.0
 
March 18, 2019, 1 p.m. 9.5 ppb (9) 1.2 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 31.0 ppb (24) 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, noon 25.1 ppb (23) 3.8 ppb (4) N/A 21.0 ppb (19) N/A 0.0 ppb (0) 14.0 ppb (11) 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 11 a.m. 15.4 ppb (14) 0.6 ppb (1) N/A 15.0 ppb (14) N/A 0.0 ppb (0) 15.0 ppb (12) 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 10 a.m. 9.4 ppb (9) 0.1 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 20.0 ppb (15) 0.15 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 9 a.m. 7.0 ppb (6) 0.2 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 23.0 ppb (18) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 8 a.m. 5.9 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 25.0 ppb (19) 0.16 ppb (2) N/A 4.0 μg/m3 (17) 19.0
 
March 18, 2019, 7 a.m. 6.9 ppb (6) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 6 a.m. 9.2 ppb (9) 0.2 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 22.0 ppb (17) 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 5 a.m. 12.1 ppb (11) 0.2 ppb (0) N/A 12.0 ppb (11) N/A 0.0 ppb (0) 20.0 ppb (15) 0.18 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 4 a.m. 9.6 ppb (9) 0.2 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 23.0 ppb (18) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 3 a.m. 6.0 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (23) 0.17 ppb (2) N/A 5.0 μg/m3 (21) 23.0
 
March 18, 2019, 2 a.m. 5.9 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (25) 0.16 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 1 a.m. 5.6 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.14 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, midnight 4.9 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (30) 0.12 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
March 17, 2019, 11 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.11 ppb (1) N/A 6.0 μg/m3 (25) 33.0