AQSQID: 250130018

Site Name: Springfieldsp

Location: Springfield (Armory Circle), MA

Reporting: True, Located: True

Current AQI: 4.0

Springfield (Armory Circle) MA, US: 42.120248, -72.58499

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 21, 2019, 8 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.33 ppb (4) N/A 1.0 μg/m3 (4) 4.0
 
May 21, 2019, 7 a.m. 0.0 ppb (0) -1.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 1.0 μg/m3 (4) 4.0
 
May 21, 2019, 6 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 21, 2019, 5 a.m. 1.0 ppb (1) -1.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 21, 2019, 4 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 21, 2019, 3 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 2 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
May 21, 2019, 1 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, midnight 9.0 ppb (8) 1.0 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 11 p.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 10 p.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 9 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
May 20, 2019, 8 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
May 20, 2019, 7 p.m. 10.0 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 6 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 5 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 4 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 3 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A 1.0 ppb (1) N/A N/A N/A 17.0 μg/m3 (61) 61.0
 
May 20, 2019, 2 p.m. 18.0 ppb (17) 5.0 ppb (5) N/A 13.0 ppb (12) N/A 1.0 ppb (1) N/A 0.39 ppb (4) N/A N/A 17.0
 
May 20, 2019, 1 p.m. 18.0 ppb (17) 5.0 ppb (5) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.42 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, noon 14.0 ppb (13) 3.0 ppb (3) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.5 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 11 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.47 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 10 a.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 9 a.m. 10.0 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.41 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
May 20, 2019, 8 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.41 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 7 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 6 a.m. 4.0 ppb (4) -1.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 20, 2019, 5 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
May 20, 2019, 4 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
May 20, 2019, 3 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 2 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 1 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, midnight 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, 11 p.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
May 19, 2019, 10 p.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 9 p.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 8 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 7 p.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 6 p.m. 5.0 ppb (5) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
May 19, 2019, 5 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, 4 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 19, 2019, 3 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 1.0 μg/m3 (4) 5.0
 
May 19, 2019, 2 p.m. 8.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
May 19, 2019, 1 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, noon 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
May 19, 2019, 11 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 1.0 ppb (1) N/A 0.42 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, 10 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, 9 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.63 ppb (7) N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, 8 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.68 ppb (8) N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.63 ppb (7) N/A 14.0 μg/m3 (54) 54.0
 
May 19, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.66 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.67 ppb (7) N/A 13.0 μg/m3 (52) 52.0
 
May 19, 2019, 4 a.m. 13.0 ppb (12) 0.0 ppb (0) N/A 13.0 ppb (12) N/A 1.0 ppb (1) N/A 0.47 ppb (5) N/A 14.0 μg/m3 (54) 54.0
 
May 19, 2019, 3 a.m. 22.0 ppb (20) 1.0 ppb (1) N/A 21.0 ppb (19) N/A 1.0 ppb (1) N/A 0.47 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
May 19, 2019, 2 a.m. 20.0 ppb (19) 2.0 ppb (2) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.36 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, 1 a.m. 22.0 ppb (20) 3.0 ppb (3) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 4.0 μg/m3 (17) 20.0
 
May 19, 2019, midnight 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 1.0 μg/m3 (4) 15.0
 
May 18, 2019, 11 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 18, 2019, 10 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 18, 2019, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 18, 2019, 8 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 18, 2019, 7 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.13 ppb (1) N/A 1.0 μg/m3 (4) 5.0
 
May 18, 2019, 6 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
May 18, 2019, 5 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.13 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
May 18, 2019, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
May 18, 2019, 3 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
May 18, 2019, 2 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 18, 2019, 1 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 18, 2019, noon 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 18, 2019, 11 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.48 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
May 18, 2019, 10 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.54 ppb (6) N/A 6.0 μg/m3 (25) 25.0
 
May 18, 2019, 9 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.51 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
May 18, 2019, 8 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.62 ppb (7) N/A 6.0 μg/m3 (25) 25.0
 
May 18, 2019, 7 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.45 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
May 18, 2019, 6 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 18, 2019, 5 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.08 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
May 18, 2019, 4 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.01 ppb (0) N/A 8.0 μg/m3 (33) 33.0
 
May 18, 2019, 3 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.08 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
May 18, 2019, 2 a.m. 9.0 ppb (8) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
May 18, 2019, 1 a.m. 40.0 ppb (37) 10.0 ppb (9) N/A 30.0 ppb (28) N/A 0.0 ppb (0) N/A 0.61 ppb (7) N/A 16.0 μg/m3 (59) 59.0
 
May 18, 2019, midnight 22.0 ppb (20) 2.0 ppb (2) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
May 17, 2019, 11 p.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.06 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
May 17, 2019, 10 p.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 1.0 ppb (1) N/A 0.06 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
May 17, 2019, 9 p.m. 15.0 ppb (14) 3.0 ppb (3) N/A 12.0 ppb (11) N/A 1.0 ppb (1) N/A 0.1 ppb (1) N/A 16.0 μg/m3 (59) 59.0
 
May 17, 2019, 8 p.m. 23.0 ppb (21) 7.0 ppb (6) N/A 16.0 ppb (15) N/A 1.0 ppb (1) N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
May 17, 2019, 7 p.m. 58.0 ppb (54) 30.0 ppb (28) N/A 29.0 ppb (27) N/A 1.0 ppb (1) N/A 0.74 ppb (8) N/A 21.0 μg/m3 (69) 69.0
 
May 17, 2019, 6 p.m. 56.0 ppb (52) 31.0 ppb (29) N/A 25.0 ppb (23) N/A 1.0 ppb (1) N/A 0.74 ppb (8) N/A 15.0 μg/m3 (56) 56.0
 
May 17, 2019, 5 p.m. 49.0 ppb (45) 26.0 ppb (24) N/A 22.0 ppb (20) N/A 1.0 ppb (1) N/A 0.63 ppb (7) N/A 19.0 μg/m3 (65) 65.0
 
May 17, 2019, 4 p.m. 42.0 ppb (39) 22.0 ppb (20) N/A 20.0 ppb (19) N/A 1.0 ppb (1) N/A 0.59 ppb (7) N/A 17.0 μg/m3 (61) 61.0
 
May 17, 2019, 3 p.m. 46.0 ppb (43) 26.0 ppb (24) N/A 19.0 ppb (18) N/A 1.0 ppb (1) N/A 0.64 ppb (7) N/A 10.0 μg/m3 (42) 43.0
 
May 17, 2019, 2 p.m. 51.0 ppb (47) 28.0 ppb (26) N/A 23.0 ppb (21) N/A 1.0 ppb (1) N/A 0.7 ppb (8) N/A 15.0 μg/m3 (56) 56.0
 
May 17, 2019, 1 p.m. 42.0 ppb (39) 17.0 ppb (16) N/A 25.0 ppb (23) N/A 1.0 ppb (1) N/A 0.63 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
May 17, 2019, noon 45.0 ppb (42) 20.0 ppb (19) N/A 25.0 ppb (23) N/A 1.0 ppb (1) N/A 0.8 ppb (9) N/A 11.0 μg/m3 (46) 46.0
 
May 17, 2019, 11 a.m. 44.0 ppb (41) 18.0 ppb (17) N/A 26.0 ppb (24) N/A 1.0 ppb (1) N/A 1.01 ppb (11) N/A 10.0 μg/m3 (42) 42.0
 
May 17, 2019, 10 a.m. 37.0 ppb (34) 14.0 ppb (13) N/A 23.0 ppb (21) N/A 1.0 ppb (1) N/A 0.92 ppb (10) N/A 8.0 μg/m3 (33) 34.0
 
May 17, 2019, 9 a.m. 44.0 ppb (41) 15.0 ppb (14) N/A 29.0 ppb (27) N/A 1.0 ppb (1) N/A 0.9 ppb (10) N/A 8.0 μg/m3 (33) 41.0
 
May 17, 2019, 8 a.m. 45.0 ppb (42) 16.0 ppb (15) N/A 30.0 ppb (28) N/A 1.0 ppb (1) N/A 0.92 ppb (10) N/A 8.0 μg/m3 (33) 42.0
 
May 17, 2019, 7 a.m. 41.0 ppb (38) 13.0 ppb (12) N/A 28.0 ppb (26) N/A 1.0 ppb (1) N/A 0.97 ppb (11) N/A 11.0 μg/m3 (46) 46.0
 
May 17, 2019, 6 a.m. 71.0 ppb (68) 39.0 ppb (36) N/A 32.0 ppb (30) N/A 1.0 ppb (1) N/A 1.03 ppb (11) N/A 7.0 μg/m3 (29) 68.0
 
May 17, 2019, 5 a.m. 49.0 ppb (45) 17.0 ppb (16) N/A 32.0 ppb (30) N/A 1.0 ppb (1) N/A 0.98 ppb (11) N/A 8.0 μg/m3 (33) 45.0
 
May 17, 2019, 4 a.m. 62.0 ppb (59) 26.0 ppb (24) N/A 36.0 ppb (33) N/A 1.0 ppb (1) N/A 1.08 ppb (12) N/A 9.0 μg/m3 (38) 59.0
 
May 17, 2019, 3 a.m. 68.0 ppb (65) 28.0 ppb (26) N/A 40.0 ppb (37) N/A 1.0 ppb (1) N/A 1.02 ppb (11) N/A 8.0 μg/m3 (33) 65.0
 
May 17, 2019, 2 a.m. 51.0 ppb (47) 16.0 ppb (15) N/A 35.0 ppb (32) N/A 1.0 ppb (1) N/A 0.93 ppb (10) N/A 10.0 μg/m3 (42) 47.0
 
May 17, 2019, 1 a.m. 25.0 ppb (23) 4.0 ppb (4) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.54 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
May 17, 2019, midnight 25.0 ppb (23) 4.0 ppb (4) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
May 16, 2019, 11 p.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.13 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
May 16, 2019, 10 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.05 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
May 16, 2019, 9 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.04 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
May 16, 2019, 8 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.05 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 7 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.09 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 6 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.04 ppb (0) N/A 1.0 μg/m3 (4) 6.0
 
May 16, 2019, 5 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
May 16, 2019, 4 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 14.0 μg/m3 (54) 54.0
 
May 16, 2019, 3 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
May 16, 2019, 2 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.04 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
May 16, 2019, 1 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 16, 2019, noon 27.0 ppb (25) 12.0 ppb (11) N/A 15.0 ppb (14) N/A 1.0 ppb (1) N/A 0.49 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
May 16, 2019, 11 a.m. 42.0 ppb (39) 24.0 ppb (22) N/A 18.0 ppb (17) N/A 1.0 ppb (1) N/A 0.8 ppb (9) N/A 9.0 μg/m3 (38) 39.0
 
May 16, 2019, 10 a.m. 49.0 ppb (45) 32.0 ppb (30) N/A 17.0 ppb (16) N/A 1.0 ppb (1) N/A N/A N/A 9.0 μg/m3 (38) 45.0
 
May 16, 2019, 9 a.m. 52.0 ppb (48) 31.0 ppb (29) N/A 21.0 ppb (19) N/A 1.0 ppb (1) N/A 0.96 ppb (11) N/A 18.0 μg/m3 (63) 63.0
 
May 16, 2019, 8 a.m. 49.0 ppb (45) 28.0 ppb (26) N/A 22.0 ppb (20) N/A 1.0 ppb (1) N/A 0.98 ppb (11) N/A 10.0 μg/m3 (42) 45.0
 
May 16, 2019, 7 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 0.89 ppb (10) N/A 6.0 μg/m3 (25) 25.0
 
May 16, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.77 ppb (9) N/A 4.0 μg/m3 (17) 17.0
 
May 16, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.63 ppb (7) N/A 7.0 μg/m3 (29) 29.0
 
May 16, 2019, 4 a.m. 12.0 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.51 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
May 16, 2019, 3 a.m. 28.0 ppb (26) 5.0 ppb (5) N/A 23.0 ppb (21) N/A 0.0 ppb (0) N/A 0.63 ppb (7) N/A 7.0 μg/m3 (29) 29.0
 
May 16, 2019, 2 a.m. 23.0 ppb (21) 3.0 ppb (3) N/A 20.0 ppb (19) N/A 0.0 ppb (0) N/A 0.62 ppb (7) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 1 a.m. 19.0 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.49 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
May 16, 2019, midnight 12.0 ppb (11) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 11 p.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
May 15, 2019, 10 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 15, 2019, 9 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.1 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 7 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 6 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 5 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
May 15, 2019, 3 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
May 15, 2019, 2 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 1 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, noon 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 11 a.m. 16.0 ppb (15) 6.0 ppb (6) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.43 ppb (5) N/A 0.0 μg/m3 (0) 15.0
 
May 15, 2019, 10 a.m. 24.0 ppb (22) 9.0 ppb (8) N/A 15.0 ppb (14) N/A N/A N/A 0.48 ppb (5) N/A 2.0 μg/m3 (8) 22.0
 
May 15, 2019, 9 a.m. 24.0 ppb (22) 11.0 ppb (10) N/A 14.0 ppb (13) N/A N/A N/A 0.41 ppb (5) N/A 3.0 μg/m3 (12) 22.0
 
May 15, 2019, 8 a.m. 9.0 ppb (8) 0.0 ppb (0) N/A 8.0 ppb (7) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 7 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
May 15, 2019, 6 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 5 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 4 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.48 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
May 15, 2019, 3 a.m. 12.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.51 ppb (6) N/A 2.0 μg/m3 (8) 11.0
 
May 15, 2019, 2 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.52 ppb (6) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 1 a.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.51 ppb (6) N/A 3.0 μg/m3 (12) 12.0
 
May 15, 2019, midnight 10.0 ppb (9) 3.0 ppb (3) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.7 ppb (8) N/A 6.0 μg/m3 (25) 25.0
 
May 14, 2019, 11 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.7 ppb (8) N/A 4.0 μg/m3 (17) 17.0
 
May 14, 2019, 10 p.m. 10.0 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.67 ppb (7) N/A 0.0 μg/m3 (0) 9.0
 
May 14, 2019, 9 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.59 ppb (7) N/A 2.0 μg/m3 (8) 10.0
 
May 14, 2019, 8 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.5 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
May 14, 2019, 7 p.m. 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
May 14, 2019, 6 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 14, 2019, 5 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 14, 2019, 4 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 14, 2019, 3 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.43 ppb (5) N/A 2.0 μg/m3 (8) 8.0
 
May 14, 2019, 2 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.42 ppb (5) N/A 3.0 μg/m3 (12) 12.0
 
May 14, 2019, 1 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
May 14, 2019, noon 10.0 ppb (9) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 14, 2019, 11 a.m. 10.0 ppb (9) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 9.0
 
May 14, 2019, 10 a.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A -4.0 μg/m3 (0) 6.0
 
May 14, 2019, 9 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0