AQSQID: 260810020

Site Name: Grand Rapids

Location: Grand Rapids, MI

Reporting: True, Located: True

Current AQI: 51.0

Grand Rapids MI, US: 42.984699, -85.671097

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 21, 2019, 8 a.m. N/A N/A 16.9 ppb (16) N/A N/A 0.0 ppb (0) 18.0 ppb (14) N/A N/A 12.4 μg/m3 (51) 51.0
 
March 21, 2019, 7 a.m. N/A N/A 14.1 ppb (13) N/A N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 13.6 μg/m3 (53) 53.0
 
March 21, 2019, 6 a.m. N/A N/A 15.0 ppb (14) N/A N/A N/A 21.0 ppb (16) 0.23 ppb (3) N/A 14.7 μg/m3 (56) 56.0
 
March 21, 2019, 5 a.m. N/A N/A 16.3 ppb (15) N/A N/A 0.0 ppb (0) 19.0 ppb (15) 0.25 ppb (3) N/A 13.8 μg/m3 (54) 54.0
 
March 21, 2019, 4 a.m. N/A N/A 15.0 ppb (14) N/A N/A 0.0 ppb (0) 20.0 ppb (15) 0.26 ppb (3) N/A 13.3 μg/m3 (53) 53.0
 
March 21, 2019, 3 a.m. N/A N/A 18.2 ppb (17) N/A N/A 0.0 ppb (0) 18.0 ppb (14) 0.31 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
March 21, 2019, 2 a.m. N/A N/A 16.3 ppb (15) N/A N/A 0.0 ppb (0) 21.0 ppb (16) 0.29 ppb (3) N/A 12.5 μg/m3 (51) 51.0
 
March 21, 2019, 1 a.m. N/A N/A 18.9 ppb (18) N/A N/A 0.0 ppb (0) 20.0 ppb (15) 0.31 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
March 21, 2019, midnight N/A N/A 19.7 ppb (18) N/A N/A 0.0 ppb (0) 21.0 ppb (16) 0.3 ppb (3) N/A 12.9 μg/m3 (52) 52.0
 
March 20, 2019, 11 p.m. N/A N/A 22.3 ppb (21) N/A N/A 0.0 ppb (0) 19.0 ppb (15) 0.33 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 10 p.m. N/A N/A 27.5 ppb (25) N/A N/A 0.0 ppb (0) 18.0 ppb (14) 0.37 ppb (4) N/A 9.4 μg/m3 (39) 39.0
 
March 20, 2019, 9 p.m. N/A N/A 24.7 ppb (23) N/A N/A 0.0 ppb (0) 21.0 ppb (16) 0.38 ppb (4) N/A 9.5 μg/m3 (40) 40.0
 
March 20, 2019, 8 p.m. N/A N/A 19.9 ppb (18) N/A N/A 0.0 ppb (0) 26.0 ppb (20) 0.34 ppb (4) N/A 6.6 μg/m3 (28) 28.0
 
March 20, 2019, 7 p.m. N/A N/A 15.7 ppb (15) N/A N/A 0.0 ppb (0) 30.0 ppb (23) 0.26 ppb (3) N/A 5.1 μg/m3 (21) 23.0
 
March 20, 2019, 6 p.m. N/A N/A 14.1 ppb (13) N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.22 ppb (2) N/A 3.7 μg/m3 (15) 25.0
 
March 20, 2019, 5 p.m. N/A N/A 12.6 ppb (12) N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 4 p.m. N/A N/A 8.1 ppb (8) N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.18 ppb (2) N/A 11.2 μg/m3 (47) 47.0
 
March 20, 2019, 3 p.m. N/A N/A 9.4 ppb (9) N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.17 ppb (2) N/A 12.5 μg/m3 (51) 51.0
 
March 20, 2019, 2 p.m. N/A N/A 11.7 ppb (11) N/A N/A 1.0 ppb (1) 35.0 ppb (27) 0.18 ppb (2) N/A 12.4 μg/m3 (51) 51.0
 
March 20, 2019, 1 p.m. N/A N/A 20.1 ppb (19) N/A N/A 0.0 ppb (0) 26.0 ppb (20) N/A N/A 14.2 μg/m3 (55) 55.0
 
March 20, 2019, noon N/A N/A 18.8 ppb (17) N/A N/A 0.0 ppb (0) 26.0 ppb (20) N/A N/A 12.4 μg/m3 (51) 51.0
 
March 20, 2019, 11 a.m. N/A N/A 19.2 ppb (18) N/A N/A 0.0 ppb (0) 25.0 ppb (19) 0.25 ppb (3) N/A 12.5 μg/m3 (51) 51.0
 
March 20, 2019, 10 a.m. N/A N/A 23.8 ppb (22) N/A N/A 0.0 ppb (0) 22.0 ppb (17) 0.26 ppb (3) N/A 12.6 μg/m3 (51) 51.0
 
March 20, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 15.0 ppb (12) 0.25 ppb (3) N/A 13.1 μg/m3 (52) 52.0
 
March 20, 2019, 8 a.m. N/A N/A 29.1 ppb (27) N/A N/A 0.0 ppb (0) 16.0 ppb (12) N/A N/A 12.2 μg/m3 (50) 50.0
 
March 20, 2019, 7 a.m. N/A N/A 15.7 ppb (15) N/A N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 14.9 μg/m3 (56) 56.0
 
March 20, 2019, 6 a.m. N/A N/A 39.3 ppb (36) N/A N/A N/A 13.0 ppb (10) 0.41 ppb (5) N/A 13.9 μg/m3 (54) 54.0
 
March 20, 2019, 5 a.m. N/A N/A 66.2 ppb (63) N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.57 ppb (6) N/A 10.2 μg/m3 (42) 63.0
 
March 20, 2019, 4 a.m. N/A N/A 64.2 ppb (61) N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.53 ppb (6) N/A 10.5 μg/m3 (44) 61.0
 
March 20, 2019, 3 a.m. N/A N/A 48.2 ppb (45) N/A N/A 0.0 ppb (0) 3.0 ppb (2) 0.49 ppb (5) N/A 10.2 μg/m3 (42) 45.0
 
March 20, 2019, 2 a.m. N/A N/A 30.5 ppb (28) N/A N/A 1.0 ppb (1) 17.0 ppb (13) 0.33 ppb (4) N/A 7.2 μg/m3 (30) 30.0
 
March 20, 2019, 1 a.m. N/A N/A 17.7 ppb (16) N/A N/A 1.0 ppb (1) 31.0 ppb (24) 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 20, 2019, midnight N/A N/A 15.6 ppb (14) N/A N/A 1.0 ppb (1) 34.0 ppb (26) 0.21 ppb (2) N/A 7.5 μg/m3 (31) 31.0
 
March 19, 2019, 11 p.m. N/A N/A 5.7 ppb (5) N/A N/A 1.0 ppb (1) 46.0 ppb (35) 0.17 ppb (2) N/A 2.7 μg/m3 (11) 35.0
 
March 19, 2019, 10 p.m. N/A N/A 4.8 ppb (4) N/A N/A 1.0 ppb (1) 47.0 ppb (36) 0.15 ppb (2) N/A 2.4 μg/m3 (10) 36.0
 
March 19, 2019, 9 p.m. N/A N/A 4.3 ppb (4) N/A N/A 1.0 ppb (1) 49.0 ppb (38) 0.15 ppb (2) N/A 0.8 μg/m3 (3) 38.0
 
March 19, 2019, 8 p.m. N/A N/A 3.7 ppb (3) N/A N/A 1.0 ppb (1) 50.0 ppb (38) 0.14 ppb (2) N/A 2.7 μg/m3 (11) 38.0
 
March 19, 2019, 7 p.m. N/A N/A 4.4 ppb (4) N/A N/A 1.0 ppb (1) 49.0 ppb (38) 0.15 ppb (2) N/A 3.1 μg/m3 (13) 38.0
 
March 19, 2019, 6 p.m. N/A N/A 4.5 ppb (4) N/A N/A 1.0 ppb (1) 48.0 ppb (37) 0.15 ppb (2) N/A 1.8 μg/m3 (8) 37.0
 
March 19, 2019, 5 p.m. N/A N/A 4.6 ppb (4) N/A N/A 1.0 ppb (1) 47.0 ppb (36) 0.15 ppb (2) N/A 1.4 μg/m3 (6) 36.0
 
March 19, 2019, 4 p.m. N/A N/A 8.4 ppb (8) N/A N/A 1.0 ppb (1) 40.0 ppb (31) 0.18 ppb (2) N/A 0.7 μg/m3 (3) 31.0
 
March 19, 2019, 3 p.m. N/A N/A 17.9 ppb (17) N/A N/A N/A 30.0 ppb (23) 0.22 ppb (2) N/A N/A 23.0
 
March 19, 2019, 2 p.m. N/A N/A 46.0 ppb (43) N/A N/A 1.0 ppb (1) N/A 0.38 ppb (4) N/A 22.0 μg/m3 (71) 71.0
 
March 19, 2019, 1 p.m. N/A N/A 131.2 ppb (106) N/A N/A 1.0 ppb (1) N/A 0.98 ppb (11) N/A 28.6 μg/m3 (85) 106.0
 
March 19, 2019, noon N/A N/A 166.7 ppb (113) N/A N/A 1.0 ppb (1) 2.0 ppb (2) 1.29 ppb (14) N/A 23.9 μg/m3 (75) 113.0
 
March 19, 2019, 11 a.m. N/A N/A 124.6 ppb (105) N/A N/A 1.0 ppb (1) 2.0 ppb (2) 0.89 ppb (10) N/A 20.2 μg/m3 (67) 105.0
 
March 19, 2019, 10 a.m. N/A N/A 88.4 ppb (87) N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.67 ppb (7) N/A 16.3 μg/m3 (59) 87.0
 
March 19, 2019, 9 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.55 ppb (6) N/A 16.6 μg/m3 (60) 60.0
 
March 19, 2019, 8 a.m. N/A N/A 83.2 ppb (81) N/A N/A 1.0 ppb (1) 2.0 ppb (2) N/A N/A 15.1 μg/m3 (57) 81.0
 
March 19, 2019, 7 a.m. N/A N/A 52.5 ppb (49) N/A N/A 0.0 ppb (0) N/A 0.42 ppb (5) N/A 13.9 μg/m3 (54) 54.0
 
March 19, 2019, 6 a.m. N/A N/A 45.8 ppb (42) N/A N/A N/A 4.0 ppb (3) 0.35 ppb (4) N/A 15.1 μg/m3 (57) 57.0
 
March 19, 2019, 5 a.m. N/A N/A 48.4 ppb (45) N/A N/A 0.0 ppb (0) 4.0 ppb (3) 0.38 ppb (4) N/A 16.5 μg/m3 (60) 60.0
 
March 19, 2019, 4 a.m. N/A N/A 42.8 ppb (40) N/A N/A 0.0 ppb (0) 9.0 ppb (7) 0.34 ppb (4) N/A 14.7 μg/m3 (56) 56.0
 
March 19, 2019, 3 a.m. N/A N/A 15.2 ppb (14) N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.28 ppb (3) N/A 11.7 μg/m3 (49) 49.0
 
March 19, 2019, 2 a.m. N/A N/A 23.0 ppb (21) N/A N/A 0.0 ppb (0) 23.0 ppb (18) 0.29 ppb (3) N/A 13.6 μg/m3 (53) 53.0
 
March 19, 2019, 1 a.m. N/A N/A 17.1 ppb (16) N/A N/A 0.0 ppb (0) 30.0 ppb (23) 0.27 ppb (3) N/A 11.1 μg/m3 (46) 46.0
 
March 19, 2019, midnight N/A N/A 13.1 ppb (12) N/A N/A 1.0 ppb (1) 36.0 ppb (28) 0.22 ppb (2) N/A 9.4 μg/m3 (39) 39.0
 
March 18, 2019, 11 p.m. N/A N/A 7.3 ppb (7) N/A N/A 2.0 ppb (3) 44.0 ppb (34) 0.17 ppb (2) N/A 8.0 μg/m3 (33) 34.0
 
March 18, 2019, 10 p.m. N/A N/A 5.0 ppb (5) N/A N/A 2.0 ppb (3) 47.0 ppb (36) 0.16 ppb (2) N/A 7.9 μg/m3 (33) 36.0
 
March 18, 2019, 9 p.m. N/A N/A 4.8 ppb (4) N/A N/A 2.0 ppb (3) 47.0 ppb (36) 0.16 ppb (2) N/A 6.7 μg/m3 (28) 36.0
 
March 18, 2019, 8 p.m. N/A N/A 6.3 ppb (6) N/A N/A 3.0 ppb (4) 46.0 ppb (35) 0.2 ppb (2) N/A 8.9 μg/m3 (37) 37.0
 
March 18, 2019, 7 p.m. N/A N/A 8.3 ppb (8) N/A N/A 2.0 ppb (3) 43.0 ppb (33) 0.2 ppb (2) N/A N/A 33.0
 
March 18, 2019, 6 p.m. N/A N/A 7.5 ppb (7) N/A N/A 2.0 ppb (3) 42.0 ppb (32) 0.2 ppb (2) N/A 6.6 μg/m3 (28) 32.0
 
March 18, 2019, 5 p.m. N/A N/A 5.9 ppb (5) N/A N/A 1.0 ppb (1) 42.0 ppb (32) 0.18 ppb (2) N/A 4.6 μg/m3 (19) 32.0
 
March 18, 2019, 4 p.m. N/A N/A 7.1 ppb (7) N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.19 ppb (2) N/A 5.4 μg/m3 (23) 32.0
 
March 18, 2019, 3 p.m. N/A N/A 7.2 ppb (7) N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.16 ppb (2) N/A 3.8 μg/m3 (16) 32.0
 
March 18, 2019, 2 p.m. N/A N/A 41.6 ppb (39) N/A N/A 0.0 ppb (0) 24.0 ppb (18) 0.37 ppb (4) N/A 12.7 μg/m3 (51) 51.0
 
March 18, 2019, 1 p.m. N/A N/A 88.7 ppb (87) N/A N/A 1.0 ppb (1) 8.0 ppb (6) 0.61 ppb (7) N/A 18.6 μg/m3 (64) 87.0
 
March 18, 2019, noon N/A N/A 162.8 ppb (112) N/A N/A 1.0 ppb (1) 2.0 ppb (2) 1.45 ppb (16) N/A 23.4 μg/m3 (74) 112.0
 
March 18, 2019, 11 a.m. N/A N/A 171.4 ppb (114) N/A N/A 1.0 ppb (1) 1.0 ppb (1) 1.25 ppb (14) N/A 16.4 μg/m3 (59) 114.0
 
March 18, 2019, 10 a.m. N/A N/A 133.2 ppb (106) N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.84 ppb (9) N/A 13.5 μg/m3 (53) 106.0
 
March 18, 2019, 9 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.5 ppb (6) N/A 13.9 μg/m3 (54) 54.0
 
March 18, 2019, 8 a.m. N/A N/A 54.4 ppb (50) N/A N/A 0.0 ppb (0) 2.0 ppb (2) N/A N/A 11.7 μg/m3 (49) 50.0
 
March 18, 2019, 7 a.m. N/A N/A 39.6 ppb (37) N/A N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 12.1 μg/m3 (50) 50.0
 
March 18, 2019, 6 a.m. N/A N/A 30.7 ppb (28) N/A N/A N/A 9.0 ppb (7) 0.29 ppb (3) N/A 13.1 μg/m3 (52) 52.0
 
March 18, 2019, 5 a.m. N/A N/A 21.5 ppb (20) N/A N/A 0.0 ppb (0) 22.0 ppb (17) 0.26 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 18, 2019, 4 a.m. N/A N/A 12.1 ppb (11) N/A N/A 0.0 ppb (0) 33.0 ppb (25) 0.19 ppb (2) N/A 9.2 μg/m3 (38) 38.0
 
March 18, 2019, 3 a.m. N/A N/A 9.9 ppb (9) N/A N/A 0.0 ppb (0) 35.0 ppb (27) 0.21 ppb (2) N/A 8.9 μg/m3 (37) 37.0
 
March 18, 2019, 2 a.m. N/A N/A 11.8 ppb (11) N/A N/A 0.0 ppb (0) 34.0 ppb (26) 0.22 ppb (2) N/A 7.2 μg/m3 (30) 30.0
 
March 18, 2019, 1 a.m. N/A N/A 9.2 ppb (9) N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.19 ppb (2) N/A 5.1 μg/m3 (21) 29.0
 
March 18, 2019, midnight N/A N/A 8.9 ppb (8) N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.19 ppb (2) N/A 8.1 μg/m3 (34) 34.0
 
March 17, 2019, 11 p.m. N/A N/A 5.7 ppb (5) N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.17 ppb (2) N/A 9.1 μg/m3 (38) 38.0
 
March 17, 2019, 10 p.m. N/A N/A 5.5 ppb (5) N/A N/A 1.0 ppb (1) 43.0 ppb (33) 0.18 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 17, 2019, 9 p.m. N/A N/A 6.1 ppb (6) N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.19 ppb (2) N/A 10.4 μg/m3 (43) 43.0
 
March 17, 2019, 8 p.m. N/A N/A 3.2 ppb (3) N/A N/A 1.0 ppb (1) 42.0 ppb (32) 0.16 ppb (2) N/A 7.1 μg/m3 (30) 32.0
 
March 17, 2019, 7 p.m. N/A N/A 3.5 ppb (3) N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.16 ppb (2) N/A 5.4 μg/m3 (23) 32.0
 
March 17, 2019, 6 p.m. N/A N/A 3.5 ppb (3) N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.16 ppb (2) N/A 4.1 μg/m3 (17) 32.0
 
March 17, 2019, 5 p.m. N/A N/A 3.2 ppb (3) N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.15 ppb (2) N/A 6.1 μg/m3 (25) 32.0
 
March 17, 2019, 4 p.m. N/A N/A 4.7 ppb (4) N/A N/A 1.0 ppb (1) 38.0 ppb (29) 0.18 ppb (2) N/A 4.1 μg/m3 (17) 29.0
 
March 17, 2019, 3 p.m. N/A N/A 7.6 ppb (7) N/A N/A 1.0 ppb (1) 35.0 ppb (27) 0.19 ppb (2) N/A 4.6 μg/m3 (19) 27.0
 
March 17, 2019, 2 p.m. N/A N/A 15.0 ppb (14) N/A N/A 0.0 ppb (0) 27.0 ppb (21) 0.25 ppb (3) N/A 5.6 μg/m3 (23) 23.0
 
March 17, 2019, 1 p.m. N/A N/A 36.1 ppb (33) N/A N/A 0.0 ppb (0) 11.0 ppb (8) 0.4 ppb (4) N/A 8.9 μg/m3 (37) 37.0
 
March 17, 2019, noon N/A N/A 52.9 ppb (49) N/A N/A 1.0 ppb (1) 3.0 ppb (2) 0.52 ppb (6) N/A 9.3 μg/m3 (39) 49.0
 
March 17, 2019, 11 a.m. N/A N/A 61.3 ppb (58) N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.81 ppb (9) N/A 10.8 μg/m3 (45) 58.0
 
March 17, 2019, 10 a.m. N/A N/A 62.8 ppb (59) N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.53 ppb (6) N/A 9.7 μg/m3 (40) 59.0
 
March 17, 2019, 9 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 1.0 ppb (1) 0.66 ppb (7) N/A 13.8 μg/m3 (54) 54.0
 
March 17, 2019, 8 a.m. N/A N/A 53.4 ppb (49) N/A N/A 0.0 ppb (0) 1.0 ppb (1) N/A N/A 9.2 μg/m3 (38) 49.0
 
March 17, 2019, 7 a.m. N/A N/A 68.1 ppb (65) N/A N/A 1.0 ppb (1) N/A 0.63 ppb (7) N/A 12.6 μg/m3 (51) 65.0
 
March 17, 2019, 6 a.m. N/A N/A 65.6 ppb (62) N/A N/A N/A 1.0 ppb (1) 0.62 ppb (7) N/A 9.9 μg/m3 (41) 62.0
 
March 17, 2019, 5 a.m. N/A N/A 52.0 ppb (48) N/A N/A 0.0 ppb (0) 1.0 ppb (1) 0.48 ppb (5) N/A 9.7 μg/m3 (40) 48.0
 
March 17, 2019, 4 a.m. N/A N/A 47.6 ppb (44) N/A N/A 0.0 ppb (0) 1.0 ppb (1) 0.44 ppb (5) N/A 10.1 μg/m3 (42) 44.0
 
March 17, 2019, 3 a.m. N/A N/A 43.9 ppb (41) N/A N/A 0.0 ppb (0) 3.0 ppb (2) 0.46 ppb (5) N/A 10.1 μg/m3 (42) 42.0
 
March 17, 2019, 2 a.m. N/A N/A 21.4 ppb (20) N/A N/A 0.0 ppb (0) 19.0 ppb (15) 0.28 ppb (3) N/A 6.4 μg/m3 (27) 27.0
 
March 17, 2019, 1 a.m. N/A N/A 9.8 ppb (9) N/A N/A 0.0 ppb (0) 30.0 ppb (23) 0.2 ppb (2) N/A 5.6 μg/m3 (23) 23.0
 
March 17, 2019, midnight N/A N/A 4.2 ppb (4) N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.13 ppb (1) N/A 6.1 μg/m3 (25) 28.0
 
March 16, 2019, 11 p.m. N/A N/A 2.4 ppb (2) N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.11 ppb (1) N/A 4.8 μg/m3 (20) 30.0
 
March 16, 2019, 10 p.m. N/A N/A 2.2 ppb (2) N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.11 ppb (1) N/A 4.8 μg/m3 (20) 30.0
 
March 16, 2019, 9 p.m. N/A N/A 2.3 ppb (2) N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.11 ppb (1) N/A 4.0 μg/m3 (17) 29.0
 
March 16, 2019, 8 p.m. N/A N/A 1.5 ppb (1) N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.07 ppb (1) N/A 4.5 μg/m3 (19) 30.0
 
March 16, 2019, 7 p.m. N/A N/A 1.9 ppb (2) N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.08 ppb (1) N/A 3.5 μg/m3 (15) 31.0
 
March 16, 2019, 6 p.m. N/A N/A 2.0 ppb (2) N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.08 ppb (1) N/A 3.9 μg/m3 (16) 32.0
 
March 16, 2019, 5 p.m. N/A N/A 2.4 ppb (2) N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.08 ppb (1) N/A 4.0 μg/m3 (17) 32.0
 
March 16, 2019, 4 p.m. N/A N/A 2.9 ppb (3) N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.03 ppb (0) N/A 3.9 μg/m3 (16) 31.0
 
March 16, 2019, 3 p.m. N/A N/A 2.6 ppb (2) N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.03 ppb (0) N/A 4.7 μg/m3 (20) 31.0
 
March 16, 2019, 2 p.m. N/A N/A 2.5 ppb (2) N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.03 ppb (0) N/A 4.1 μg/m3 (17) 31.0
 
March 16, 2019, 1 p.m. N/A N/A 4.4 ppb (4) N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.05 ppb (1) N/A 4.5 μg/m3 (19) 28.0
 
March 16, 2019, noon N/A N/A 9.3 ppb (9) N/A N/A 0.0 ppb (0) 30.0 ppb (23) 0.12 ppb (1) N/A 5.5 μg/m3 (23) 23.0
 
March 16, 2019, 11 a.m. N/A N/A 6.4 ppb (6) N/A N/A 0.0 ppb (0) 34.0 ppb (26) 0.14 ppb (2) N/A 5.3 μg/m3 (22) 26.0
 
March 16, 2019, 10 a.m. N/A N/A 2.0 ppb (2) N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.06 ppb (1) N/A 5.2 μg/m3 (22) 30.0
 
March 16, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.06 ppb (1) N/A 4.5 μg/m3 (19) 31.0
 
March 16, 2019, 8 a.m. N/A N/A 2.3 ppb (2) N/A N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 4.9 μg/m3 (20) 30.0
 
March 16, 2019, 7 a.m. N/A N/A 3.1 ppb (3) N/A N/A 0.0 ppb (0) N/A 0.04 ppb (0) N/A 4.9 μg/m3 (20) 20.0
 
March 16, 2019, 6 a.m. N/A N/A 2.0 ppb (2) N/A N/A N/A 40.0 ppb (31) 0.04 ppb (0) N/A 5.2 μg/m3 (22) 31.0
 
March 16, 2019, 5 a.m. N/A N/A 1.6 ppb (1) N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.04 ppb (0) N/A 4.6 μg/m3 (19) 32.0
 
March 16, 2019, 4 a.m. N/A N/A 3.2 ppb (3) N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.03 ppb (0) N/A 6.7 μg/m3 (28) 31.0
 
March 16, 2019, 3 a.m. N/A N/A 3.4 ppb (3) N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.03 ppb (0) N/A 6.5 μg/m3 (27) 31.0
 
March 16, 2019, 2 a.m. N/A N/A 6.0 ppb (6) N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.06 ppb (1) N/A 6.3 μg/m3 (26) 29.0
 
March 16, 2019, 1 a.m. N/A N/A 4.8 ppb (4) N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.04 ppb (0) N/A 6.7 μg/m3 (28) 30.0
 
March 16, 2019, midnight N/A N/A 5.1 ppb (5) N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.07 ppb (1) N/A 8.5 μg/m3 (35) 35.0
 
March 15, 2019, 11 p.m. N/A N/A 4.8 ppb (4) N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.07 ppb (1) N/A 8.6 μg/m3 (36) 36.0
 
March 15, 2019, 10 p.m. N/A N/A 6.5 ppb (6) N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.09 ppb (1) N/A 7.3 μg/m3 (30) 30.0
 
March 15, 2019, 9 p.m. N/A N/A 6.9 ppb (6) N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.11 ppb (1) N/A 7.7 μg/m3 (32) 32.0
 
March 15, 2019, 8 p.m. N/A N/A 6.1 ppb (6) N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.13 ppb (1) N/A 7.4 μg/m3 (31) 31.0
 
March 15, 2019, 7 p.m. N/A N/A 6.3 ppb (6) N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.13 ppb (1) N/A 6.4 μg/m3 (27) 28.0
 
March 15, 2019, 6 p.m. N/A N/A 7.9 ppb (7) N/A N/A 0.0 ppb (0) 33.0 ppb (25) 0.14 ppb (2) N/A 5.7 μg/m3 (24) 25.0
 
March 15, 2019, 5 p.m. N/A N/A 6.0 ppb (6) N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.12 ppb (1) N/A 5.2 μg/m3 (22) 25.0
 
March 15, 2019, 4 p.m. N/A N/A 5.8 ppb (5) N/A N/A 0.0 ppb (0) 27.0 ppb (21) 0.12 ppb (1) N/A 4.8 μg/m3 (20) 21.0
 
March 15, 2019, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (17) 0.14 ppb (2) N/A 4.3 μg/m3 (18) 18.0
 
March 15, 2019, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (16) 0.13 ppb (1) N/A 4.1 μg/m3 (17) 17.0
 
March 15, 2019, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (15) 0.13 ppb (1) N/A 3.8 μg/m3 (16) 16.0
 
March 15, 2019, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (15) 0.14 ppb (2) N/A 3.0 μg/m3 (12) 15.0
 
March 15, 2019, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (17) 0.13 ppb (1) N/A 3.8 μg/m3 (16) 17.0
 
March 15, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (19) 0.11 ppb (1) N/A 4.4 μg/m3 (18) 19.0
 
March 15, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (21) 0.1 ppb (1) N/A 5.4 μg/m3 (23) 23.0
 
March 15, 2019, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 5.0 μg/m3 (21) 22.0
 
March 15, 2019, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.13 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 15, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) 0.13 ppb (1) N/A 5.1 μg/m3 (21) 27.0
 
March 15, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.12 ppb (1) N/A 5.4 μg/m3 (23) 28.0
 
March 15, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.13 ppb (1) N/A 5.4 μg/m3 (23) 29.0
 
March 15, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.14 ppb (2) N/A 6.6 μg/m3 (28) 29.0
 
March 15, 2019, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.14 ppb (2) N/A 6.3 μg/m3 (26) 29.0
 
March 15, 2019, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.14 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 15, 2019, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.12 ppb (1) N/A 8.2 μg/m3 (34) 34.0
 
March 14, 2019, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (32) 0.12 ppb (1) N/A 3.7 μg/m3 (15) 32.0
 
March 14, 2019, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.16 ppb (2) N/A 6.0 μg/m3 (25) 28.0
 
March 14, 2019, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.2 ppb (2) N/A 8.4 μg/m3 (35) 35.0
 
March 14, 2019, 8 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 35.0 ppb (27) 0.15 ppb (2) N/A 8.6 μg/m3 (36) 36.0
 
March 14, 2019, 7 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 36.0 ppb (28) 0.15 ppb (2) N/A 6.5 μg/m3 (27) 28.0
 
March 14, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (22) 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 14, 2019, 5 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 42.0 ppb (32) 0.11 ppb (1) N/A 2.8 μg/m3 (12) 32.0
 
March 14, 2019, 4 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 38.0 ppb (29) 0.12 ppb (1) N/A 8.3 μg/m3 (35) 35.0
 
March 14, 2019, 3 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 35.0 ppb (27) 0.12 ppb (1) N/A 10.9 μg/m3 (45) 45.0
 
March 14, 2019, 2 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 37.0 ppb (28) 0.11 ppb (1) N/A 10.9 μg/m3 (45) 45.0
 
March 14, 2019, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (25) 0.12 ppb (1) N/A 9.9 μg/m3 (41) 41.0
 
March 14, 2019, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.12 ppb (1) N/A 9.3 μg/m3 (39) 39.0
 
March 14, 2019, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (27) 0.1 ppb (1) N/A 7.9 μg/m3 (33) 33.0
 
March 14, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.08 ppb (1) N/A 10.0 μg/m3 (42) 42.0
 
March 14, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.06 ppb (1) N/A 8.7 μg/m3 (36) 36.0