AQSQID: 270031002

Site Name: Blaine

Location: Blaine, MN

Reporting: True, Located: True

Current AQI: 38.0

Blaine MN, US: 45.1425, -93.2139

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 22, 2019, 7 a.m. 4.1 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.2 ppb (2) 6.0 μg/m3 (5) 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 6 a.m. 3.8 ppb (4) 0.9 ppb (1) 3.4 ppb (3) 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.2 ppb (2) 9.0 μg/m3 (8) 9.0 μg/m3 (38) 38.0
 
March 22, 2019, 5 a.m. 6.5 ppb (6) 1.3 ppb (1) 6.8 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 48.0 ppb (37) 0.23 ppb (3) 14.0 μg/m3 (13) 9.0 μg/m3 (38) 38.0
 
March 22, 2019, 4 a.m. 8.2 ppb (8) 1.3 ppb (1) 9.7 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 47.0 ppb (36) 0.24 ppb (3) 15.0 μg/m3 (14) 13.0 μg/m3 (52) 52.0
 
March 22, 2019, 3 a.m. 8.1 ppb (8) 1.3 ppb (1) 10.2 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 48.0 ppb (37) 0.24 ppb (3) 22.0 μg/m3 (20) 16.0 μg/m3 (59) 59.0
 
March 22, 2019, 1 a.m. 7.8 ppb (7) 1.2 ppb (1) 9.8 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 50.0 ppb (38) 0.26 ppb (3) 19.0 μg/m3 (17) 17.0 μg/m3 (61) 61.0
 
March 22, 2019, midnight 8.8 ppb (8) 1.2 ppb (1) 10.7 ppb (10) 8.0 ppb (7) N/A 1.0 ppb (1) 49.0 ppb (38) 0.27 ppb (3) 20.0 μg/m3 (18) 16.0 μg/m3 (59) 59.0
 
March 21, 2019, 11 p.m. 7.2 ppb (7) 1.3 ppb (1) 8.8 ppb (8) 6.0 ppb (6) N/A 1.0 ppb (1) 51.0 ppb (39) 0.25 ppb (3) 20.0 μg/m3 (18) 14.0 μg/m3 (54) 54.0
 
March 21, 2019, 10 p.m. 5.7 ppb (5) 1.5 ppb (1) 6.9 ppb (6) 4.0 ppb (4) N/A 1.0 ppb (1) 53.0 ppb (41) 0.23 ppb (3) 22.0 μg/m3 (20) 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 9 p.m. 5.3 ppb (5) 1.4 ppb (1) 5.5 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 50.0 ppb (38) 0.23 ppb (3) 53.0 μg/m3 (48) 11.0 μg/m3 (46) 48.0
 
March 21, 2019, 8 p.m. 5.7 ppb (5) 1.8 ppb (2) 5.7 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 48.0 ppb (37) 0.23 ppb (3) 20.0 μg/m3 (18) 8.0 μg/m3 (33) 37.0
 
March 21, 2019, 7 p.m. 5.1 ppb (5) 1.6 ppb (1) 4.7 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) N/A 0.21 ppb (2) N/A N/A 5.0
 
March 21, 2019, 6 p.m. 5.0 ppb (5) 1.5 ppb (1) N/A 3.0 ppb (3) N/A N/A 46.0 ppb (35) N/A 8.0 μg/m3 (7) 5.0 μg/m3 (21) 35.0
 
March 21, 2019, 5 p.m. N/A N/A 4.7 ppb (4) N/A N/A 0.0 ppb (0) 45.0 ppb (35) 0.21 ppb (2) 9.0 μg/m3 (8) 6.0 μg/m3 (25) 35.0
 
March 21, 2019, 4 p.m. 5.7 ppb (5) 2.1 ppb (2) 5.2 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 43.0 ppb (33) 0.21 ppb (2) 4.0 μg/m3 (4) 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 3 p.m. 7.4 ppb (7) 2.6 ppb (2) 6.5 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 41.0 ppb (32) 0.22 ppb (2) 17.0 μg/m3 (15) 6.0 μg/m3 (25) 32.0
 
March 21, 2019, 2 p.m. 16.2 ppb (15) 4.7 ppb (4) 15.3 ppb (14) 12.0 ppb (11) N/A 0.0 ppb (0) 32.0 ppb (25) 0.28 ppb (3) 18.0 μg/m3 (16) 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 1 p.m. 34.5 ppb (32) 9.5 ppb (9) 33.4 ppb (31) 25.0 ppb (23) N/A 0.0 ppb (0) 18.0 ppb (14) 0.38 ppb (4) 8.0 μg/m3 (7) 7.0 μg/m3 (29) 32.0
 
March 21, 2019, noon 45.6 ppb (42) 10.3 ppb (10) 37.9 ppb (35) 35.0 ppb (32) N/A 0.0 ppb (0) 7.0 ppb (5) 0.43 ppb (5) 4.0 μg/m3 (4) 6.0 μg/m3 (25) 42.0
 
March 21, 2019, 11 a.m. 24.4 ppb (23) 1.5 ppb (1) 22.4 ppb (21) 23.0 ppb (21) N/A 0.0 ppb (0) 17.0 ppb (13) 0.32 ppb (4) 4.0 μg/m3 (4) 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 10 a.m. 26.1 ppb (24) 2.7 ppb (3) 20.3 ppb (19) 23.0 ppb (21) N/A 0.0 ppb (0) 17.0 ppb (13) 0.27 ppb (3) 6.0 μg/m3 (5) 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 9 a.m. 20.8 ppb (19) 1.9 ppb (2) 19.0 ppb (18) 19.0 ppb (18) N/A 0.0 ppb (0) 22.0 ppb (17) 0.24 ppb (3) 6.0 μg/m3 (5) 4.0 μg/m3 (17) 19.0
 
March 21, 2019, 8 a.m. 10.8 ppb (10) 1.1 ppb (1) 9.6 ppb (9) 9.0 ppb (8) N/A 0.0 ppb (0) 27.0 ppb (21) N/A 3.0 μg/m3 (3) 5.0 μg/m3 (21) 21.0
 
March 21, 2019, 7 a.m. 9.2 ppb (9) 1.4 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 31.0 ppb (24) 0.23 ppb (3) 0.0 μg/m3 (0) 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 6 a.m. 6.4 ppb (6) 1.0 ppb (1) 5.6 ppb (5) 5.0 ppb (5) N/A N/A 34.0 ppb (26) 0.22 ppb (2) 1.0 μg/m3 (1) 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 5 a.m. 4.9 ppb (5) 1.4 ppb (1) 3.4 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (30) 0.22 ppb (2) 4.0 μg/m3 (4) 3.0 μg/m3 (12) 30.0
 
March 21, 2019, 4 a.m. 4.4 ppb (4) 1.4 ppb (1) 2.7 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) 0.22 ppb (2) 2.0 μg/m3 (2) 3.0 μg/m3 (12) 31.0
 
March 21, 2019, 3 a.m. 3.7 ppb (3) 1.3 ppb (1) 2.2 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (32) 0.22 ppb (2) 2.0 μg/m3 (2) 3.0 μg/m3 (12) 32.0
 
March 21, 2019, 2 a.m. 3.7 ppb (3) 1.1 ppb (1) 2.5 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) 0.22 ppb (2) 4.0 μg/m3 (4) 3.0 μg/m3 (12) 33.0
 
March 21, 2019, 1 a.m. 4.9 ppb (5) 1.3 ppb (1) 3.4 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.22 ppb (2) 5.0 μg/m3 (5) 6.0 μg/m3 (25) 33.0
 
March 21, 2019, midnight 3.7 ppb (3) 1.5 ppb (1) 2.1 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) 0.23 ppb (3) 6.0 μg/m3 (5) 7.0 μg/m3 (29) 35.0
 
March 20, 2019, 11 p.m. 3.0 ppb (3) 1.1 ppb (1) 1.6 ppb (1) 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) 0.21 ppb (2) 4.0 μg/m3 (4) 4.0 μg/m3 (17) 35.0
 
March 20, 2019, 10 p.m. 2.6 ppb (2) 1.2 ppb (1) 1.4 ppb (1) 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) 0.21 ppb (2) 4.0 μg/m3 (4) 3.0 μg/m3 (12) 36.0
 
March 20, 2019, 9 p.m. 3.1 ppb (3) 1.3 ppb (1) 1.7 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.2 ppb (2) 7.0 μg/m3 (6) 3.0 μg/m3 (12) 37.0
 
March 20, 2019, 8 p.m. 3.1 ppb (3) 1.3 ppb (1) 1.8 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.2 ppb (2) 10.0 μg/m3 (9) 5.0 μg/m3 (21) 37.0
 
March 20, 2019, 7 p.m. 3.0 ppb (3) 1.3 ppb (1) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.2 ppb (2) 13.0 μg/m3 (12) 4.0 μg/m3 (17) 37.0
 
March 20, 2019, 6 p.m. 2.9 ppb (3) 1.0 ppb (1) 2.8 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.21 ppb (2) N/A N/A 38.0
 
March 20, 2019, 5 p.m. 3.7 ppb (3) 1.6 ppb (1) 3.3 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 48.0 ppb (37) 0.21 ppb (2) 9.0 μg/m3 (8) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 4 p.m. 5.7 ppb (5) 1.8 ppb (2) 5.7 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 44.0 ppb (34) 0.21 ppb (2) 17.0 μg/m3 (15) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 3 p.m. 6.7 ppb (6) 1.7 ppb (2) 7.1 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 43.0 ppb (33) 0.21 ppb (2) 11.0 μg/m3 (10) 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 2 p.m. 8.8 ppb (8) 2.1 ppb (2) 8.6 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 43.0 ppb (33) 0.23 ppb (3) 12.0 μg/m3 (11) 12.0 μg/m3 (50) 50.0
 
March 20, 2019, 1 p.m. 8.7 ppb (8) 1.9 ppb (2) 8.5 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 45.0 ppb (35) 0.23 ppb (3) 10.0 μg/m3 (9) 12.0 μg/m3 (50) 50.0
 
March 20, 2019, noon 10.2 ppb (9) 1.6 ppb (1) 9.9 ppb (9) 9.0 ppb (8) N/A 0.0 ppb (0) 42.0 ppb (32) 0.24 ppb (3) 15.0 μg/m3 (14) 13.0 μg/m3 (52) 52.0
 
March 20, 2019, 11 a.m. 8.3 ppb (8) 1.4 ppb (1) 7.8 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 43.0 ppb (33) 0.23 ppb (3) 6.0 μg/m3 (5) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 10 a.m. 7.3 ppb (7) 1.5 ppb (1) 6.7 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 42.0 ppb (32) 0.22 ppb (2) 7.0 μg/m3 (6) 6.0 μg/m3 (25) 32.0
 
March 20, 2019, 9 a.m. 6.1 ppb (6) 1.3 ppb (1) 5.8 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 43.0 ppb (33) 0.21 ppb (2) 12.0 μg/m3 (11) 7.0 μg/m3 (29) 33.0
 
March 20, 2019, 8 a.m. 5.9 ppb (5) 0.9 ppb (1) 6.1 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 43.0 ppb (33) N/A 9.0 μg/m3 (8) 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 7 a.m. 6.3 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 44.0 ppb (34) 0.23 ppb (3) 12.0 μg/m3 (11) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 6 a.m. 7.1 ppb (7) 1.0 ppb (1) 6.9 ppb (6) 6.0 ppb (6) N/A N/A 43.0 ppb (33) 0.23 ppb (3) 13.0 μg/m3 (12) 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 5 a.m. 7.5 ppb (7) 1.2 ppb (1) 7.3 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 41.0 ppb (32) 0.24 ppb (3) 8.0 μg/m3 (7) 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 4 a.m. 7.7 ppb (7) 1.2 ppb (1) 7.4 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) 0.25 ppb (3) 10.0 μg/m3 (9) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 3 a.m. 8.1 ppb (8) 1.1 ppb (1) 8.1 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) 0.25 ppb (3) 11.0 μg/m3 (10) 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 2 a.m. 7.6 ppb (7) 1.1 ppb (1) 7.7 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) 0.25 ppb (3) 11.0 μg/m3 (10) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 1 a.m. 7.6 ppb (7) 1.3 ppb (1) 7.7 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) 0.25 ppb (3) 9.0 μg/m3 (8) 5.0 μg/m3 (21) 31.0
 
March 20, 2019, midnight 6.4 ppb (6) 0.9 ppb (1) 6.8 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 42.0 ppb (32) 0.24 ppb (3) 12.0 μg/m3 (11) 7.0 μg/m3 (29) 32.0
 
March 19, 2019, 11 p.m. 5.2 ppb (5) 1.4 ppb (1) 5.3 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 45.0 ppb (35) 0.23 ppb (3) 9.0 μg/m3 (8) 7.0 μg/m3 (29) 35.0
 
March 19, 2019, 10 p.m. 6.2 ppb (6) 1.6 ppb (1) 5.9 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 45.0 ppb (35) 0.23 ppb (3) 11.0 μg/m3 (10) 8.0 μg/m3 (33) 35.0
 
March 19, 2019, 9 p.m. 5.6 ppb (5) 1.7 ppb (2) 5.6 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 46.0 ppb (35) 0.23 ppb (3) 11.0 μg/m3 (10) 2.0 μg/m3 (8) 35.0
 
March 19, 2019, 8 p.m. 6.4 ppb (6) 2.1 ppb (2) 6.0 ppb (6) 4.0 ppb (4) N/A 1.0 ppb (1) 45.0 ppb (35) 0.22 ppb (2) 12.0 μg/m3 (11) 5.0 μg/m3 (21) 35.0
 
March 19, 2019, 7 p.m. 6.2 ppb (6) 1.8 ppb (2) 6.0 ppb (6) 4.0 ppb (4) N/A 1.0 ppb (1) 44.0 ppb (34) 0.22 ppb (2) 17.0 μg/m3 (15) 6.0 μg/m3 (25) 34.0
 
March 19, 2019, 6 p.m. 6.9 ppb (6) 2.2 ppb (2) 6.8 ppb (6) 5.0 ppb (5) N/A 1.0 ppb (1) 42.0 ppb (32) 0.23 ppb (3) 16.0 μg/m3 (15) 6.0 μg/m3 (25) 32.0
 
March 19, 2019, 5 p.m. 7.8 ppb (7) 2.6 ppb (2) 7.3 ppb (7) 5.0 ppb (5) N/A 1.0 ppb (1) 41.0 ppb (32) 0.23 ppb (3) 13.0 μg/m3 (12) 7.0 μg/m3 (29) 32.0
 
March 19, 2019, 4 p.m. 8.4 ppb (8) 2.7 ppb (3) 7.6 ppb (7) 6.0 ppb (6) N/A 1.0 ppb (1) 40.0 ppb (31) 0.23 ppb (3) 19.0 μg/m3 (17) 5.0 μg/m3 (21) 31.0
 
March 19, 2019, 3 p.m. 10.4 ppb (10) 3.2 ppb (3) 8.8 ppb (8) 7.0 ppb (6) N/A 1.0 ppb (1) 38.0 ppb (29) 0.23 ppb (3) 22.0 μg/m3 (20) 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 2 p.m. 18.8 ppb (17) 5.3 ppb (5) 17.2 ppb (16) 13.0 ppb (12) N/A 1.0 ppb (1) 33.0 ppb (25) 0.26 ppb (3) 18.0 μg/m3 (16) 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 1 p.m. 34.0 ppb (31) 7.8 ppb (7) 33.1 ppb (31) 26.0 ppb (24) N/A 0.0 ppb (0) 22.0 ppb (17) 0.31 ppb (3) 22.0 μg/m3 (20) 9.0 μg/m3 (38) 38.0
 
March 19, 2019, noon 30.2 ppb (28) 3.2 ppb (3) 29.8 ppb (28) 27.0 ppb (25) N/A 0.0 ppb (0) 19.0 ppb (15) 0.32 ppb (4) 11.0 μg/m3 (10) 5.0 μg/m3 (21) 28.0
 
March 19, 2019, 11 a.m. 20.6 ppb (19) 1.5 ppb (1) 20.3 ppb (19) 19.0 ppb (18) N/A 0.0 ppb (0) 26.0 ppb (20) 0.28 ppb (3) 8.0 μg/m3 (7) 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 10 a.m. 18.2 ppb (17) 1.3 ppb (1) 18.6 ppb (17) 17.0 ppb (16) N/A 0.0 ppb (0) 30.0 ppb (23) 0.26 ppb (3) 9.0 μg/m3 (8) 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 9 a.m. 18.7 ppb (17) 1.5 ppb (1) 19.8 ppb (18) 17.0 ppb (16) N/A 0.0 ppb (0) 32.0 ppb (25) 0.26 ppb (3) 13.0 μg/m3 (12) 13.0 μg/m3 (52) 52.0
 
March 19, 2019, 8 a.m. 22.8 ppb (21) 1.1 ppb (1) 25.0 ppb (23) 21.0 ppb (19) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 18.0 μg/m3 (16) 24.0 μg/m3 (76) 76.0
 
March 19, 2019, 7 a.m. 26.7 ppb (25) 1.4 ppb (1) N/A 25.0 ppb (23) N/A 0.0 ppb (0) 27.0 ppb (21) 0.32 ppb (4) 31.0 μg/m3 (28) 31.0 μg/m3 (90) 90.0
 
March 19, 2019, 6 a.m. 24.6 ppb (23) 0.9 ppb (1) 27.1 ppb (25) 23.0 ppb (21) N/A N/A 32.0 ppb (25) 0.3 ppb (3) 23.0 μg/m3 (21) 21.0 μg/m3 (69) 69.0
 
March 19, 2019, 5 a.m. 26.1 ppb (24) 1.3 ppb (1) 30.2 ppb (28) 25.0 ppb (23) N/A 0.0 ppb (0) 31.0 ppb (24) 0.31 ppb (3) 21.0 μg/m3 (19) 25.0 μg/m3 (78) 78.0
 
March 19, 2019, 4 a.m. 32.9 ppb (30) 1.3 ppb (1) 35.4 ppb (33) 32.0 ppb (30) N/A 0.0 ppb (0) 26.0 ppb (20) 0.35 ppb (4) 23.0 μg/m3 (21) 25.0 μg/m3 (78) 78.0
 
March 19, 2019, 3 a.m. 27.7 ppb (26) 1.5 ppb (1) 30.5 ppb (28) 26.0 ppb (24) N/A 0.0 ppb (0) 29.0 ppb (22) 0.35 ppb (4) 18.0 μg/m3 (16) 20.0 μg/m3 (67) 67.0
 
March 19, 2019, 2 a.m. 20.2 ppb (19) 1.3 ppb (1) 22.8 ppb (21) 19.0 ppb (18) N/A 0.0 ppb (0) 36.0 ppb (28) 0.34 ppb (4) 17.0 μg/m3 (15) 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 1 a.m. 10.4 ppb (10) 1.0 ppb (1) 11.4 ppb (11) 9.0 ppb (8) N/A 0.0 ppb (0) 48.0 ppb (37) 0.28 ppb (3) 13.0 μg/m3 (12) 11.0 μg/m3 (46) 46.0
 
March 19, 2019, midnight 7.6 ppb (7) 1.3 ppb (1) 7.3 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 51.0 ppb (39) 0.24 ppb (3) 12.0 μg/m3 (11) 9.0 μg/m3 (38) 39.0
 
March 18, 2019, 11 p.m. 6.1 ppb (6) 1.3 ppb (1) 6.3 ppb (6) 5.0 ppb (5) N/A 1.0 ppb (1) 53.0 ppb (41) 0.24 ppb (3) 11.0 μg/m3 (10) 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 10 p.m. 6.1 ppb (6) 1.4 ppb (1) 6.0 ppb (6) 5.0 ppb (5) N/A 1.0 ppb (1) 53.0 ppb (41) 0.24 ppb (3) 11.0 μg/m3 (10) 5.0 μg/m3 (21) 41.0
 
March 18, 2019, 9 p.m. 6.1 ppb (6) 1.6 ppb (1) 5.7 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 52.0 ppb (40) 0.23 ppb (3) 9.0 μg/m3 (8) 6.0 μg/m3 (25) 40.0
 
March 18, 2019, 8 p.m. 5.7 ppb (5) 1.5 ppb (1) 5.0 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 50.0 ppb (38) 0.23 ppb (3) 12.0 μg/m3 (11) 5.0 μg/m3 (21) 38.0
 
March 18, 2019, 7 p.m. 5.5 ppb (5) 1.7 ppb (2) 4.6 ppb (4) 4.0 ppb (4) N/A 1.0 ppb (1) 51.0 ppb (39) 0.22 ppb (2) 15.0 μg/m3 (14) 7.0 μg/m3 (29) 39.0
 
March 18, 2019, 6 p.m. 6.8 ppb (6) 2.0 ppb (2) 6.5 ppb (6) 5.0 ppb (5) N/A 1.0 ppb (1) 50.0 ppb (38) 0.23 ppb (3) 11.0 μg/m3 (10) 7.0 μg/m3 (29) 38.0
 
March 18, 2019, 5 p.m. 10.7 ppb (10) 2.7 ppb (3) 10.4 ppb (10) 8.0 ppb (7) N/A 2.0 ppb (3) 47.0 ppb (36) 0.25 ppb (3) 12.0 μg/m3 (11) 11.0 μg/m3 (46) 46.0
 
March 18, 2019, 4 p.m. 10.8 ppb (10) 2.8 ppb (3) 10.3 ppb (10) 8.0 ppb (7) N/A 1.0 ppb (1) 48.0 ppb (37) 0.24 ppb (3) 22.0 μg/m3 (20) 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 3 p.m. 11.7 ppb (11) 3.1 ppb (3) 11.6 ppb (11) 8.0 ppb (7) N/A 0.0 ppb (0) 46.0 ppb (35) 0.24 ppb (3) 23.0 μg/m3 (21) 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 2 p.m. 17.7 ppb (16) 4.2 ppb (4) 18.4 ppb (17) 14.0 ppb (13) N/A 0.0 ppb (0) 40.0 ppb (31) 0.28 ppb (3) 14.0 μg/m3 (13) 14.0 μg/m3 (54) 54.0
 
March 18, 2019, 1 p.m. 31.6 ppb (29) 5.9 ppb (5) 31.9 ppb (30) 26.0 ppb (24) N/A 0.0 ppb (0) 27.0 ppb (21) 0.35 ppb (4) 17.0 μg/m3 (15) 16.0 μg/m3 (59) 59.0
 
March 18, 2019, noon 44.1 ppb (41) 5.7 ppb (5) 42.3 ppb (39) 39.0 ppb (36) N/A 0.0 ppb (0) 13.0 ppb (10) 0.4 ppb (4) 21.0 μg/m3 (19) 22.0 μg/m3 (71) 71.0
 
March 18, 2019, 11 a.m. 30.0 ppb (28) 1.6 ppb (1) 31.1 ppb (29) 29.0 ppb (27) N/A 0.0 ppb (0) 22.0 ppb (17) 0.33 ppb (4) 16.0 μg/m3 (15) 17.0 μg/m3 (61) 61.0
 
March 18, 2019, 10 a.m. 13.1 ppb (12) 1.4 ppb (1) 14.7 ppb (14) 12.0 ppb (11) N/A 0.0 ppb (0) 38.0 ppb (29) 0.28 ppb (3) 15.0 μg/m3 (14) 15.0 μg/m3 (56) 56.0
 
March 18, 2019, 9 a.m. 12.0 ppb (11) 1.4 ppb (1) 12.7 ppb (12) 10.0 ppb (9) N/A 0.0 ppb (0) 38.0 ppb (29) 0.24 ppb (3) 14.0 μg/m3 (13) 16.0 μg/m3 (59) 59.0
 
March 18, 2019, 8 a.m. 12.4 ppb (11) 1.2 ppb (1) 14.0 ppb (13) 11.0 ppb (10) N/A 0.0 ppb (0) 36.0 ppb (28) N/A 15.0 μg/m3 (14) 17.0 μg/m3 (61) 61.0
 
March 18, 2019, 7 a.m. 18.8 ppb (17) 1.4 ppb (1) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 27.0 ppb (21) 0.31 ppb (3) 25.0 μg/m3 (23) 22.0 μg/m3 (71) 71.0
 
March 18, 2019, 6 a.m. 16.0 ppb (15) 1.1 ppb (1) 20.1 ppb (19) 15.0 ppb (14) N/A N/A 27.0 ppb (21) 0.3 ppb (3) 23.0 μg/m3 (21) 22.0 μg/m3 (71) 71.0
 
March 18, 2019, 5 a.m. 15.1 ppb (14) 1.2 ppb (1) 18.0 ppb (17) 14.0 ppb (13) N/A 0.0 ppb (0) 30.0 ppb (23) 0.3 ppb (3) 17.0 μg/m3 (15) 20.0 μg/m3 (67) 67.0
 
March 18, 2019, 4 a.m. 10.9 ppb (10) 1.4 ppb (1) 11.2 ppb (10) 9.0 ppb (8) N/A 0.0 ppb (0) 35.0 ppb (27) 0.24 ppb (3) 16.0 μg/m3 (15) 18.0 μg/m3 (63) 63.0
 
March 18, 2019, 3 a.m. 8.0 ppb (7) 1.3 ppb (1) 12.7 ppb (12) 7.0 ppb (6) N/A 0.0 ppb (0) 39.0 ppb (30) 0.25 ppb (3) 14.0 μg/m3 (13) 16.0 μg/m3 (59) 59.0
 
March 18, 2019, 2 a.m. 7.0 ppb (6) 1.3 ppb (1) 9.9 ppb (9) 6.0 ppb (6) N/A 0.0 ppb (0) 45.0 ppb (35) 0.23 ppb (3) 14.0 μg/m3 (13) 19.0 μg/m3 (65) 65.0
 
March 18, 2019, 1 a.m. 5.5 ppb (5) 1.3 ppb (1) 5.9 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 48.0 ppb (37) 0.23 ppb (3) 9.0 μg/m3 (8) 12.0 μg/m3 (50) 50.0
 
March 18, 2019, midnight 4.4 ppb (4) 1.2 ppb (1) 4.3 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 52.0 ppb (40) 0.23 ppb (3) 10.0 μg/m3 (9) 10.0 μg/m3 (42) 42.0
 
March 17, 2019, 11 p.m. 3.4 ppb (3) 1.1 ppb (1) 4.0 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 55.0 ppb (42) 0.22 ppb (2) 6.0 μg/m3 (5) 12.0 μg/m3 (50) 50.0
 
March 17, 2019, 10 p.m. 4.4 ppb (4) 1.2 ppb (1) 5.4 ppb (5) 3.0 ppb (3) N/A 1.0 ppb (1) 55.0 ppb (42) 0.23 ppb (3) 15.0 μg/m3 (14) 15.0 μg/m3 (56) 56.0
 
March 17, 2019, 9 p.m. 4.9 ppb (5) 1.5 ppb (1) 5.6 ppb (5) 3.0 ppb (3) N/A 1.0 ppb (1) 55.0 ppb (42) 0.23 ppb (3) 17.0 μg/m3 (15) 14.0 μg/m3 (54) 54.0
 
March 17, 2019, 8 p.m. 4.1 ppb (4) 1.2 ppb (1) 4.8 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 55.0 ppb (42) 0.23 ppb (3) 17.0 μg/m3 (15) 14.0 μg/m3 (54) 54.0
 
March 17, 2019, 7 p.m. 4.5 ppb (4) 1.4 ppb (1) 4.7 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 55.0 ppb (42) 0.23 ppb (3) 20.0 μg/m3 (18) 15.0 μg/m3 (56) 56.0
 
March 17, 2019, 6 p.m. 5.1 ppb (5) 1.7 ppb (2) 5.0 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 52.0 ppb (40) 0.23 ppb (3) 25.0 μg/m3 (23) 17.0 μg/m3 (61) 61.0
 
March 17, 2019, 5 p.m. 4.9 ppb (5) 1.8 ppb (2) 4.8 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.22 ppb (2) 14.0 μg/m3 (13) 20.0 μg/m3 (67) 67.0
 
March 17, 2019, 4 p.m. 6.7 ppb (6) 2.0 ppb (2) 7.1 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 49.0 ppb (38) 0.23 ppb (3) 16.0 μg/m3 (15) 19.0 μg/m3 (65) 65.0
 
March 17, 2019, 3 p.m. 14.6 ppb (14) 3.2 ppb (3) 15.8 ppb (15) 11.0 ppb (10) N/A 0.0 ppb (0) 42.0 ppb (32) 0.24 ppb (3) 16.0 μg/m3 (15) 17.0 μg/m3 (61) 61.0
 
March 17, 2019, 2 p.m. 11.0 ppb (10) 2.2 ppb (2) 12.6 ppb (12) 9.0 ppb (8) N/A 0.0 ppb (0) 43.0 ppb (33) 0.24 ppb (3) 13.0 μg/m3 (12) 16.0 μg/m3 (59) 59.0
 
March 17, 2019, 1 p.m. 8.6 ppb (8) 1.6 ppb (1) 10.2 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 43.0 ppb (33) 0.23 ppb (3) 19.0 μg/m3 (17) 20.0 μg/m3 (67) 67.0
 
March 17, 2019, noon 6.5 ppb (6) 1.2 ppb (1) 8.0 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 43.0 ppb (33) 0.21 ppb (2) 17.0 μg/m3 (15) 19.0 μg/m3 (65) 65.0
 
March 17, 2019, 11 a.m. 6.1 ppb (6) 1.2 ppb (1) 7.2 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 43.0 ppb (33) 0.22 ppb (2) 14.0 μg/m3 (13) 17.0 μg/m3 (61) 61.0
 
March 17, 2019, 10 a.m. 6.0 ppb (6) 0.9 ppb (1) 7.1 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.22 ppb (2) 11.0 μg/m3 (10) 14.0 μg/m3 (54) 54.0
 
March 17, 2019, 9 a.m. 7.0 ppb (6) 1.3 ppb (1) 7.6 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) 0.2 ppb (2) 10.0 μg/m3 (9) 8.0 μg/m3 (33) 33.0
 
March 17, 2019, 8 a.m. 7.1 ppb (7) 0.9 ppb (1) 7.8 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 38.0 ppb (29) N/A 8.0 μg/m3 (7) 11.0 μg/m3 (46) 46.0
 
March 17, 2019, 7 a.m. 8.9 ppb (8) 1.4 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 37.0 ppb (28) 0.23 ppb (3) 7.0 μg/m3 (6) 11.0 μg/m3 (46) 46.0
 
March 17, 2019, 6 a.m. 8.6 ppb (8) 1.0 ppb (1) 9.6 ppb (9) 7.0 ppb (6) N/A N/A 37.0 ppb (28) 0.24 ppb (3) 7.0 μg/m3 (6) 8.0 μg/m3 (33) 33.0
 
March 17, 2019, 5 a.m. 9.1 ppb (8) 1.5 ppb (1) 9.3 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 38.0 ppb (29) 0.24 ppb (3) 5.0 μg/m3 (5) 12.0 μg/m3 (50) 50.0
 
March 17, 2019, 4 a.m. 11.9 ppb (11) 1.2 ppb (1) 12.0 ppb (11) 11.0 ppb (10) N/A 0.0 ppb (0) 36.0 ppb (28) 0.27 ppb (3) 7.0 μg/m3 (6) 12.0 μg/m3 (50) 50.0
 
March 17, 2019, 3 a.m. 14.5 ppb (13) 1.1 ppb (1) 15.0 ppb (14) 13.0 ppb (12) N/A 0.0 ppb (0) 33.0 ppb (25) 0.3 ppb (3) 8.0 μg/m3 (7) 9.0 μg/m3 (38) 38.0
 
March 17, 2019, 2 a.m. 13.1 ppb (12) 1.3 ppb (1) 13.1 ppb (12) 12.0 ppb (11) N/A 0.0 ppb (0) 35.0 ppb (27) 0.28 ppb (3) 5.0 μg/m3 (5) 4.0 μg/m3 (17) 27.0
 
March 17, 2019, 1 a.m. 8.4 ppb (8) 1.3 ppb (1) 8.2 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) 0.25 ppb (3) 7.0 μg/m3 (6) 4.0 μg/m3 (17) 31.0
 
March 17, 2019, midnight 5.0 ppb (5) 1.2 ppb (1) 4.8 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 45.0 ppb (35) 0.23 ppb (3) 4.0 μg/m3 (4) 5.0 μg/m3 (21) 35.0
 
March 16, 2019, 11 p.m. 3.6 ppb (3) 1.3 ppb (1) 3.3 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.21 ppb (2) 8.0 μg/m3 (7) 4.0 μg/m3 (17) 38.0
 
March 16, 2019, 10 p.m. 3.8 ppb (4) 1.5 ppb (1) 3.6 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 49.0 ppb (38) 0.21 ppb (2) 8.0 μg/m3 (7) 2.0 μg/m3 (8) 38.0
 
March 16, 2019, 9 p.m. 4.4 ppb (4) 1.7 ppb (2) 3.9 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 46.0 ppb (35) 0.21 ppb (2) 6.0 μg/m3 (5) 4.0 μg/m3 (17) 35.0
 
March 16, 2019, 8 p.m. 3.4 ppb (3) 1.5 ppb (1) 2.9 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 47.0 ppb (36) 0.22 ppb (2) 7.0 μg/m3 (6) 6.0 μg/m3 (25) 36.0
 
March 16, 2019, 7 p.m. 3.2 ppb (3) 1.4 ppb (1) 2.7 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) 0.21 ppb (2) 11.0 μg/m3 (10) 5.0 μg/m3 (21) 36.0
 
March 16, 2019, 6 p.m. 3.1 ppb (3) 1.6 ppb (1) 2.4 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 46.0 ppb (35) 0.2 ppb (2) 9.0 μg/m3 (8) 2.0 μg/m3 (8) 35.0
 
March 16, 2019, 5 p.m. 4.4 ppb (4) 2.0 ppb (2) 3.8 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) 0.21 ppb (2) 8.0 μg/m3 (7) 5.0 μg/m3 (21) 34.0
 
March 16, 2019, 4 p.m. 4.1 ppb (4) 2.0 ppb (2) 3.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) 0.21 ppb (2) 14.0 μg/m3 (13) 5.0 μg/m3 (21) 33.0
 
March 16, 2019, 3 p.m. 5.9 ppb (5) 2.4 ppb (2) 5.3 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) 0.21 ppb (2) 15.0 μg/m3 (14) 7.0 μg/m3 (29) 32.0
 
March 16, 2019, 2 p.m. 5.6 ppb (5) 2.1 ppb (2) 5.6 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) 0.24 ppb (3) 8.0 μg/m3 (7) 6.0 μg/m3 (25) 31.0
 
March 16, 2019, 1 p.m. 10.0 ppb (9) 2.4 ppb (2) 10.0 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.22 ppb (2) 8.0 μg/m3 (7) 5.0 μg/m3 (21) 27.0
 
March 16, 2019, noon 11.8 ppb (11) 1.5 ppb (1) 12.0 ppb (11) 10.0 ppb (9) N/A 0.0 ppb (0) 30.0 ppb (23) 0.23 ppb (3) 2.0 μg/m3 (2) 5.0 μg/m3 (21) 23.0
 
March 16, 2019, 11 a.m. 9.0 ppb (8) 1.0 ppb (1) 9.2 ppb (9) 8.0 ppb (7) N/A 0.0 ppb (0) 33.0 ppb (25) 0.21 ppb (2) 2.0 μg/m3 (2) 4.0 μg/m3 (17) 25.0
 
March 16, 2019, 10 a.m. 7.6 ppb (7) 1.1 ppb (1) 7.8 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.21 ppb (2) 4.0 μg/m3 (4) 3.0 μg/m3 (12) 27.0
 
March 16, 2019, 9 a.m. 7.3 ppb (7) 1.2 ppb (1) 7.2 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (28) 0.19 ppb (2) 4.0 μg/m3 (4) 4.0 μg/m3 (17) 28.0
 
March 16, 2019, 8 a.m. 5.7 ppb (5) 0.8 ppb (1) 5.4 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) N/A 3.0 μg/m3 (3) 2.0 μg/m3 (8) 29.0
 
March 16, 2019, 7 a.m. 4.3 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) 0.19 ppb (2) 0.0 μg/m3 (0) 2.0 μg/m3 (8) 32.0
 
March 16, 2019, 6 a.m. 5.2 ppb (5) 1.0 ppb (1) 4.8 ppb (4) 4.0 ppb (4) N/A N/A 40.0 ppb (31) 0.19 ppb (2) -1.0 μg/m3 (0) 4.0 μg/m3 (17) 31.0
 
March 16, 2019, 5 a.m. 5.3 ppb (5) 1.3 ppb (1) 4.6 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (32) 0.19 ppb (2) 2.0 μg/m3 (2) 5.0 μg/m3 (21) 32.0
 
March 16, 2019, 4 a.m. 4.3 ppb (4) 1.3 ppb (1) 3.5 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.19 ppb (2) 2.0 μg/m3 (2) 3.0 μg/m3 (12) 33.0
 
March 16, 2019, 3 a.m. 2.9 ppb (3) 1.3 ppb (1) 2.4 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) 0.18 ppb (2) -1.0 μg/m3 (0) 3.0 μg/m3 (12) 34.0
 
March 16, 2019, 2 a.m. 4.0 ppb (4) 1.3 ppb (1) 3.4 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.19 ppb (2) 0.0 μg/m3 (0) 3.0 μg/m3 (12) 33.0
 
March 16, 2019, 1 a.m. 4.6 ppb (4) 1.3 ppb (1) 3.9 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 42.0 ppb (32) 0.19 ppb (2) 1.0 μg/m3 (1) 2.0 μg/m3 (8) 32.0
 
March 16, 2019, midnight 3.8 ppb (4) 1.4 ppb (1) 3.0 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) 0.19 ppb (2) 0.0 μg/m3 (0) 2.0 μg/m3 (8) 33.0
 
March 15, 2019, 11 p.m. 2.6 ppb (2) 1.3 ppb (1) 2.0 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.19 ppb (2) -1.0 μg/m3 (0) 2.0 μg/m3 (8) 34.0
 
March 15, 2019, 10 p.m. 3.4 ppb (3) 1.6 ppb (1) 2.2 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) 0.19 ppb (2) 2.0 μg/m3 (2) 2.0 μg/m3 (8) 34.0
 
March 15, 2019, 9 p.m. 2.7 ppb (3) 1.4 ppb (1) 1.8 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.18 ppb (2) 3.0 μg/m3 (3) 2.0 μg/m3 (8) 34.0
 
March 15, 2019, 8 p.m. 2.3 ppb (2) 1.2 ppb (1) 1.4 ppb (1) 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.18 ppb (2) 2.0 μg/m3 (2) 3.0 μg/m3 (12) 34.0
 
March 15, 2019, 7 p.m. 2.3 ppb (2) 1.4 ppb (1) 1.0 ppb (1) 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.18 ppb (2) 2.0 μg/m3 (2) 3.0 μg/m3 (12) 34.0
 
March 15, 2019, 6 p.m. 3.6 ppb (3) 2.0 ppb (2) 2.3 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.18 ppb (2) 4.0 μg/m3 (4) 4.0 μg/m3 (17) 34.0
 
March 15, 2019, 5 p.m. 3.1 ppb (3) 1.9 ppb (2) 2.2 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (33) 0.17 ppb (2) 4.0 μg/m3 (4) 3.0 μg/m3 (12) 33.0
 
March 15, 2019, 4 p.m. 3.4 ppb (3) 1.9 ppb (2) 2.7 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 42.0 ppb (32) 0.17 ppb (2) 2.0 μg/m3 (2) -1.0 μg/m3 (0) 32.0
 
March 15, 2019, 3 p.m. 3.8 ppb (4) 2.0 ppb (2) 3.0 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (32) 0.17 ppb (2) 3.0 μg/m3 (3) 0.0 μg/m3 (0) 32.0
 
March 15, 2019, 2 p.m. 3.1 ppb (3) 1.8 ppb (2) 2.2 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 40.0 ppb (31) 0.17 ppb (2) 3.0 μg/m3 (3) 4.0 μg/m3 (17) 31.0
 
March 15, 2019, 1 p.m. 3.1 ppb (3) 1.6 ppb (1) 2.1 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 40.0 ppb (31) 0.16 ppb (2) 1.0 μg/m3 (1) 5.0 μg/m3 (21) 31.0
 
March 15, 2019, noon 2.8 ppb (3) 1.5 ppb (1) 1.9 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 41.0 ppb (32) 0.16 ppb (2) -2.0 μg/m3 (0) 5.0 μg/m3 (21) 32.0
 
March 15, 2019, 11 a.m. 2.2 ppb (2) 1.3 ppb (1) 1.4 ppb (1) 1.0 ppb (1) N/A 0.0 ppb (0) 41.0 ppb (32) 0.16 ppb (2) 2.0 μg/m3 (2) 5.0 μg/m3 (21) 32.0
 
March 15, 2019, 10 a.m. 2.0 ppb (2) 1.2 ppb (1) 1.0 ppb (1) 1.0 ppb (1) N/A 0.0 ppb (0) 42.0 ppb (32) 0.16 ppb (2) 5.0 μg/m3 (5) 3.0 μg/m3 (12) 32.0
 
March 15, 2019, 9 a.m. 1.9 ppb (2) 1.3 ppb (1) 0.8 ppb (1) 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (33) 0.14 ppb (2) 2.0 μg/m3 (2) 5.0 μg/m3 (21) 33.0
 
March 15, 2019, 8 a.m. 1.3 ppb (1) 0.8 ppb (1) 0.6 ppb (1) 0.0 ppb (0) N/A 0.0 ppb (0) 43.0 ppb (33) N/A 3.0 μg/m3 (3) 6.0 μg/m3 (25) 33.0
 
March 15, 2019, 7 a.m. 1.6 ppb (1) 1.1 ppb (1) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 43.0 ppb (33) 0.15 ppb (2) 3.0 μg/m3 (3) 4.0 μg/m3 (17) 33.0