AQSQID: 250270023

Site Name: Worcester

Location: Worcester (Asylum St), MA

Reporting: True, Located: True

Current AQI: 17.0

Worcester (Asylum St) MA, US: 42.263901, -71.794701

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 24, 2019, 10 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 24, 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 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 8 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 7 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 24, 2019, 6 p.m. 9.0 ppb (8) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 20.0 μg/m3 (67) 67.0
 
March 24, 2019, 5 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 10.0 μg/m3 (42) 42.0
 
March 24, 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 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 24, 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 0.18 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 24, 2019, 2 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 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 0.17 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2019, noon 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 11 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 10 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 24, 2019, 9 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 8 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 24, 2019, 7 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2019, 6 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 5 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2019, 4 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 3 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 2 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 1 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2019, midnight 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 23, 2019, 11 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 10 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2019, 9 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, 8 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 7 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2019, 6 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2019, 5 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 4 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 3 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 2 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 1 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, noon 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
 
March 23, 2019, 11 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 23, 2019, 10 a.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 1.0 μg/m3 (4) 5.0
 
March 23, 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 0.15 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 23, 2019, 8 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 4 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 3 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 2 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 1.0 μg/m3 (4) 6.0
 
March 23, 2019, 1 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 1.0 μg/m3 (4) 7.0
 
March 23, 2019, midnight 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 22, 2019, 11 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 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 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 9 p.m. 13.0 ppb (12) 5.0 ppb (5) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
March 22, 2019, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
March 22, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
March 22, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
March 22, 2019, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2019, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 22, 2019, 3 p.m. 16.0 ppb (15) 6.0 ppb (6) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 2 p.m. 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 1 p.m. 15.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 1.0 μg/m3 (4) 14.0
 
March 22, 2019, noon 13.0 ppb (12) 5.0 ppb (5) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.43 ppb (5) N/A 0.0 μg/m3 (0) 12.0
 
March 22, 2019, 11 a.m. 16.0 ppb (15) 5.0 ppb (5) 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) 15.0
 
March 22, 2019, 10 a.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.3 ppb (3) N/A 2.0 μg/m3 (8) 10.0
 
March 22, 2019, 9 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2019, 8 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 7 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A -1.0 μg/m3 (0) 3.0
 
March 22, 2019, 6 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 5 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 4 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 3 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 2 a.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 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 1 a.m. 12.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, midnight 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 11 p.m. 17.0 ppb (16) 2.0 ppb (2) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 21, 2019, 10 p.m. 27.0 ppb (25) 6.0 ppb (6) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 21, 2019, 9 p.m. 24.0 ppb (22) 6.0 ppb (6) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 21, 2019, 6 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2019, 5 p.m. 19.0 ppb (18) 6.0 ppb (6) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 4.0 μg/m3 (17) 18.0
 
March 21, 2019, 4 p.m. 18.0 ppb (17) 5.0 ppb (5) N/A 13.0 ppb (12) N/A 1.0 ppb (1) N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 3 p.m. 21.0 ppb (19) 6.0 ppb (6) N/A 14.0 ppb (13) N/A 1.0 ppb (1) N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 21, 2019, 2 p.m. 22.0 ppb (20) 7.0 ppb (6) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 1 p.m. 31.0 ppb (29) 9.0 ppb (8) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
March 21, 2019, noon 41.0 ppb (38) 13.0 ppb (12) N/A 28.0 ppb (26) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
March 21, 2019, 11 a.m. 62.0 ppb (59) 20.0 ppb (19) N/A 42.0 ppb (39) N/A 0.0 ppb (0) N/A 0.43 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
March 21, 2019, 10 a.m. 44.0 ppb (41) 9.0 ppb (8) N/A 35.0 ppb (32) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 21, 2019, 9 a.m. 31.0 ppb (29) 3.0 ppb (3) N/A 27.0 ppb (25) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 8 a.m. 16.0 ppb (15) 1.0 ppb (1) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 7 a.m. 21.0 ppb (19) 1.0 ppb (1) N/A 20.0 ppb (19) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 17.0 μg/m3 (61) 61.0
 
March 21, 2019, 6 a.m. 17.0 ppb (16) 1.0 ppb (1) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 14.0 μg/m3 (54) 54.0
 
March 21, 2019, 5 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 4 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A N/A 9.0
 
March 21, 2019, 3 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 2 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 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 0.22 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, midnight 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 20, 2019, 11 p.m. 24.0 ppb (22) 6.0 ppb (6) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 10 p.m. 14.0 ppb (13) 3.0 ppb (3) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
March 20, 2019, 9 p.m. 20.0 ppb (19) 7.0 ppb (6) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.45 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 8 p.m. 17.0 ppb (16) 6.0 ppb (6) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
March 20, 2019, 7 p.m. 17.0 ppb (16) 7.0 ppb (6) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
March 20, 2019, 6 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 5 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 20, 2019, 4 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 19.0 μg/m3 (65) 65.0
 
March 20, 2019, 3 p.m. 12.0 ppb (11) 5.0 ppb (5) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
March 20, 2019, 2 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 1 p.m. 82.0 ppb (80) 46.0 ppb (43) N/A 36.0 ppb (33) N/A 1.0 ppb (1) N/A 0.43 ppb (5) N/A 17.0 μg/m3 (61) 80.0
 
March 20, 2019, noon 140.0 ppb (108) 93.0 ppb (91) N/A 47.0 ppb (44) N/A 2.0 ppb (3) N/A 0.67 ppb (7) N/A 21.0 μg/m3 (69) 108.0
 
March 20, 2019, 11 a.m. 118.0 ppb (103) 72.0 ppb (69) N/A 46.0 ppb (43) N/A 1.0 ppb (1) N/A 0.7 ppb (8) N/A 24.0 μg/m3 (76) 103.0
 
March 20, 2019, 10 a.m. 81.0 ppb (79) 39.0 ppb (36) N/A 42.0 ppb (39) N/A 1.0 ppb (1) N/A N/A N/A 12.0 μg/m3 (50) 79.0
 
March 20, 2019, 9 a.m. 80.0 ppb (78) 39.0 ppb (36) N/A 40.0 ppb (37) N/A 1.0 ppb (1) N/A 0.39 ppb (4) N/A 20.0 μg/m3 (67) 78.0
 
March 20, 2019, 8 a.m. 110.0 ppb (102) 64.0 ppb (61) N/A 45.0 ppb (42) N/A 1.0 ppb (1) N/A 0.53 ppb (6) N/A 13.0 μg/m3 (52) 102.0
 
March 20, 2019, 7 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 0.38 ppb (4) N/A 16.0 μg/m3 (59) 59.0
 
March 20, 2019, 6 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 0.39 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
March 20, 2019, 5 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 0.43 ppb (5) N/A 14.0 μg/m3 (54) 54.0
 
March 20, 2019, 4 a.m. 56.0 ppb (52) 16.0 ppb (15) N/A 40.0 ppb (37) N/A 0.0 ppb (0) N/A 0.36 ppb (4) N/A 12.0 μg/m3 (50) 52.0
 
March 20, 2019, 3 a.m. 31.0 ppb (29) 6.0 ppb (6) N/A 25.0 ppb (23) N/A 0.0 ppb (0) N/A 0.36 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
March 20, 2019, 2 a.m. 32.0 ppb (30) 4.0 ppb (4) N/A 28.0 ppb (26) N/A 0.0 ppb (0) N/A 0.39 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 1 a.m. 17.0 ppb (16) 2.0 ppb (2) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 20, 2019, midnight 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 11 p.m. 14.0 ppb (13) 3.0 ppb (3) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 10 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 7.0
 
March 19, 2019, 9 p.m. 9.0 ppb (8) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 19, 2019, 8 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 7 p.m. 13.0 ppb (12) 7.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 6 p.m. 15.0 ppb (14) 7.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 5 p.m. 7.0 ppb (6) 4.0 ppb (4) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 19, 2019, 4 p.m. 6.0 ppb (6) 4.0 ppb (4) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 3 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 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 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 1 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, noon 32.0 ppb (30) 15.0 ppb (14) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.42 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 11 a.m. 36.0 ppb (33) 12.0 ppb (11) N/A 24.0 ppb (22) N/A 0.0 ppb (0) N/A 0.41 ppb (5) N/A 19.0 μg/m3 (65) 65.0
 
March 19, 2019, 10 a.m. 32.0 ppb (30) 11.0 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 9 a.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.24 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 19, 2019, 8 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A 0.27 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 7 a.m. 16.0 ppb (15) 1.0 ppb (1) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 6 a.m. 56.0 ppb (52) 18.0 ppb (17) N/A 38.0 ppb (35) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 17.0 μg/m3 (61) 61.0
 
March 19, 2019, 5 a.m. 80.0 ppb (78) 35.0 ppb (32) N/A 46.0 ppb (43) N/A 1.0 ppb (1) N/A 0.37 ppb (4) N/A 11.0 μg/m3 (46) 78.0
 
March 19, 2019, 4 a.m. 70.0 ppb (67) 27.0 ppb (25) N/A 44.0 ppb (41) N/A 1.0 ppb (1) N/A 0.39 ppb (4) N/A 13.0 μg/m3 (52) 67.0
 
March 19, 2019, 3 a.m. 86.0 ppb (84) 38.0 ppb (35) N/A 48.0 ppb (44) N/A 1.0 ppb (1) N/A 0.38 ppb (4) N/A 14.0 μg/m3 (54) 84.0
 
March 19, 2019, 2 a.m. 38.0 ppb (35) 10.0 ppb (9) N/A 28.0 ppb (26) N/A 0.0 ppb (0) N/A 0.4 ppb (4) N/A 7.0 μg/m3 (29) 35.0
 
March 19, 2019, 1 a.m. 20.0 ppb (19) 3.0 ppb (3) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, midnight 14.0 ppb (13) 4.0 ppb (4) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 11 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 10 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 18, 2019, 9 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 8 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 7 p.m. 13.0 ppb (12) 7.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
March 18, 2019, 6 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 5 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 4 p.m. 7.0 ppb (6) 4.0 ppb (4) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 3 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 10.0
 
March 18, 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 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 1 p.m. 9.0 ppb (8) 5.0 ppb (5) 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
 
March 18, 2019, noon 20.0 ppb (19) 9.0 ppb (8) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 11 a.m. 31.0 ppb (29) 11.0 ppb (10) N/A 20.0 ppb (19) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 10 a.m. 37.0 ppb (34) 10.0 ppb (9) N/A 26.0 ppb (24) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 34.0
 
March 18, 2019, 9 a.m. 45.0 ppb (42) 10.0 ppb (9) N/A 35.0 ppb (32) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 42.0
 
March 18, 2019, 8 a.m. 24.0 ppb (22) 3.0 ppb (3) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 7 a.m. 17.0 ppb (16) 1.0 ppb (1) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 6 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 5 a.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 4 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 18, 2019, 3 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 2 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 1 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, midnight 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 17, 2019, 11 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0