AQSQID: 250270023

Site Name: Worcester

Location: Worcester (Downtown Worcester), MA

Reporting: True, Located: True

Current AQI: 33.0

Worcester (Downtown Worcester) MA, US: 42.263901, -71.794701

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 21, 2020, 11 a.m. 15.0 ppb (14) 3.0 ppb (3) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 21, 2020, 10 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2020, 9 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2020, 8 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2020, 7 a.m. 12.0 ppb (11) 1.0 ppb (1) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2020, 6 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 21, 2020, 5 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 21, 2020, 4 a.m. 12.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 21, 2020, 3 a.m. 16.0 ppb (15) 4.0 ppb (4) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2020, 2 a.m. 25.0 ppb (23) 10.0 ppb (9) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2020, 1 a.m. 20.0 ppb (19) 5.0 ppb (5) 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
 
Jan. 21, 2020, midnight 17.0 ppb (16) 4.0 ppb (4) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
Jan. 20, 2020, 11 p.m. 17.0 ppb (16) 4.0 ppb (4) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
Jan. 20, 2020, 10 p.m. 25.0 ppb (23) 8.0 ppb (7) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.39 ppb (4) N/A 3.0 μg/m3 (12) 23.0
 
Jan. 20, 2020, 9 p.m. 22.0 ppb (20) 8.0 ppb (7) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 3.0 μg/m3 (12) 20.0
 
Jan. 20, 2020, 8 p.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 2.0 μg/m3 (8) 13.0
 
Jan. 20, 2020, 7 p.m. 12.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 20, 2020, 6 p.m. 13.0 ppb (12) 6.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 20, 2020, 5 p.m. 13.0 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 20, 2020, 4 p.m. 12.0 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 18.0 μg/m3 (63) 63.0
 
Jan. 20, 2020, 3 p.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 2 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 1 p.m. 13.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2020, noon 13.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 20, 2020, 11 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2020, 10 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 20, 2020, 9 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 20, 2020, 8 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 20, 2020, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 20, 2020, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 4 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A N/A 6.0
 
Jan. 20, 2020, 3 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A N/A 6.0
 
Jan. 20, 2020, 2 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2020, 1 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2020, midnight 10.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 9.0
 
Jan. 19, 2020, 11 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 19, 2020, 10 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 9 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2020, 8 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 7 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 6 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 5 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2020, 4 p.m. 9.0 ppb (8) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 19, 2020, 3 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 2 p.m. 19.0 ppb (18) 8.0 ppb (7) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 1 p.m. 29.0 ppb (27) 13.0 ppb (12) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2020, noon 24.0 ppb (22) 8.0 ppb (7) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2020, 11 a.m. 33.0 ppb (31) 16.0 ppb (15) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2020, 10 a.m. 105.0 ppb (101) 71.0 ppb (68) N/A 34.0 ppb (31) N/A 1.0 ppb (1) N/A 0.77 ppb (9) N/A 26.0 μg/m3 (80) 101.0
 
Jan. 19, 2020, 9 a.m. 72.0 ppb (69) 38.0 ppb (35) N/A 33.0 ppb (31) N/A 1.0 ppb (1) N/A 0.63 ppb (7) N/A 16.0 μg/m3 (59) 69.0
 
Jan. 19, 2020, 8 a.m. 86.0 ppb (84) 50.0 ppb (46) N/A 36.0 ppb (33) N/A 1.0 ppb (1) N/A 0.52 ppb (6) N/A 20.0 μg/m3 (67) 84.0
 
Jan. 19, 2020, 7 a.m. 53.0 ppb (49) 22.0 ppb (20) N/A 30.0 ppb (28) N/A 0.0 ppb (0) N/A 0.48 ppb (5) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2020, 6 a.m. 33.0 ppb (31) 7.0 ppb (6) N/A 26.0 ppb (24) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2020, 5 a.m. 47.0 ppb (44) 19.0 ppb (18) N/A 28.0 ppb (26) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 22.0 μg/m3 (71) 71.0
 
Jan. 19, 2020, 4 a.m. 45.0 ppb (42) 15.0 ppb (14) N/A 30.0 ppb (28) N/A 0.0 ppb (0) N/A 0.45 ppb (5) N/A N/A 42.0
 
Jan. 19, 2020, 3 a.m. 27.0 ppb (25) 4.0 ppb (4) N/A 23.0 ppb (21) N/A 0.0 ppb (0) N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 19, 2020, 2 a.m. 25.0 ppb (23) 3.0 ppb (3) N/A 22.0 ppb (20) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2020, 1 a.m. 31.0 ppb (29) 8.0 ppb (7) N/A 23.0 ppb (21) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 19, 2020, midnight 48.0 ppb (44) 18.0 ppb (17) N/A 30.0 ppb (28) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 5.0 μg/m3 (21) 44.0
 
Jan. 18, 2020, 11 p.m. 37.0 ppb (34) 11.0 ppb (10) N/A 26.0 ppb (24) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 7.0 μg/m3 (29) 34.0
 
Jan. 18, 2020, 10 p.m. 20.0 ppb (19) 5.0 ppb (5) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 9 p.m. 24.0 ppb (22) 7.0 ppb (6) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 4.0 μg/m3 (17) 22.0
 
Jan. 18, 2020, 8 p.m. 19.0 ppb (18) 6.0 ppb (6) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 7 p.m. 19.0 ppb (18) 6.0 ppb (6) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 6 p.m. 22.0 ppb (20) 6.0 ppb (6) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 20.0
 
Jan. 18, 2020, 5 p.m. 26.0 ppb (24) 8.0 ppb (7) N/A 17.0 ppb (16) N/A 1.0 ppb (1) N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 4 p.m. 26.0 ppb (24) 7.0 ppb (6) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 3 p.m. 16.0 ppb (15) 4.0 ppb (4) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 18, 2020, 2 p.m. 13.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.45 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2020, 1 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 18, 2020, noon 7.0 ppb (6) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 11 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2020, 10 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2020, 9 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.13 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 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 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 7 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2020, 6 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 18, 2020, 5 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 4 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2020, 3 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 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 0.14 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 1 a.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 18, 2020, midnight 14.0 ppb (13) 4.0 ppb (4) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2020, 11 p.m. 14.0 ppb (13) 4.0 ppb (4) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2020, 10 p.m. 20.0 ppb (19) 8.0 ppb (7) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, 9 p.m. 23.0 ppb (21) 10.0 ppb (9) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, 8 p.m. 18.0 ppb (17) 9.0 ppb (8) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 0.0 μg/m3 (0) 17.0
 
Jan. 17, 2020, 7 p.m. 13.0 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2020, 6 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 17, 2020, 5 p.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 17, 2020, 4 p.m. 15.0 ppb (14) 8.0 ppb (7) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2020, 3 p.m. 12.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2020, 2 p.m. 13.0 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2020, 1 p.m. 14.0 ppb (13) 6.0 ppb (6) 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
 
Jan. 17, 2020, noon 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2020, 11 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, 10 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 17, 2020, 9 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.11 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, 8 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2020, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.11 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 17, 2020, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 17, 2020, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.12 ppb (1) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 17, 2020, 4 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, 3 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2020, 2 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2020, 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 0.17 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2020, midnight 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2020, 11 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 2.0 μg/m3 (8) 9.0
 
Jan. 16, 2020, 10 p.m. 17.0 ppb (16) 8.0 ppb (7) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 1.0 μg/m3 (4) 16.0
 
Jan. 16, 2020, 9 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 2.0 μg/m3 (8) 14.0
 
Jan. 16, 2020, 8 p.m. 15.0 ppb (14) 7.0 ppb (6) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 2.0 μg/m3 (8) 14.0
 
Jan. 16, 2020, 7 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 9.0
 
Jan. 16, 2020, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 16, 2020, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 16, 2020, 4 p.m. N/A N/A N/A N/A N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 16, 2020, 3 p.m. 15.0 ppb (14) 7.0 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 16, 2020, 2 p.m. 50.0 ppb (46) 29.0 ppb (27) N/A 20.0 ppb (19) N/A 0.0 ppb (0) N/A 0.65 ppb (7) N/A 8.0 μg/m3 (33) 46.0
 
Jan. 16, 2020, 1 p.m. 63.0 ppb (60) 38.0 ppb (35) N/A 25.0 ppb (23) N/A 1.0 ppb (1) N/A 0.84 ppb (9) N/A 9.0 μg/m3 (38) 60.0
 
Jan. 16, 2020, noon 49.0 ppb (45) 24.0 ppb (22) N/A 25.0 ppb (23) N/A 0.0 ppb (0) N/A 0.48 ppb (5) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 16, 2020, 11 a.m. 49.0 ppb (45) 25.0 ppb (23) N/A 24.0 ppb (22) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 16, 2020, 10 a.m. 65.0 ppb (62) 38.0 ppb (35) N/A 26.0 ppb (24) N/A 1.0 ppb (1) N/A 0.38 ppb (4) N/A 10.0 μg/m3 (42) 62.0
 
Jan. 16, 2020, 9 a.m. 41.0 ppb (38) 17.0 ppb (16) N/A 25.0 ppb (23) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 7.0 μg/m3 (29) 38.0
 
Jan. 16, 2020, 8 a.m. 51.0 ppb (47) 24.0 ppb (22) N/A 27.0 ppb (25) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 47.0
 
Jan. 16, 2020, 7 a.m. 61.0 ppb (57) 33.0 ppb (31) N/A 28.0 ppb (26) N/A 0.0 ppb (0) N/A 0.46 ppb (5) N/A 12.0 μg/m3 (50) 57.0
 
Jan. 16, 2020, 6 a.m. 70.0 ppb (67) 44.0 ppb (41) N/A 27.0 ppb (25) N/A 1.0 ppb (1) N/A 0.49 ppb (5) N/A 15.0 μg/m3 (56) 67.0
 
Jan. 16, 2020, 5 a.m. 75.0 ppb (72) 48.0 ppb (44) N/A 27.0 ppb (25) N/A 1.0 ppb (1) N/A 0.51 ppb (6) N/A 14.0 μg/m3 (54) 72.0
 
Jan. 16, 2020, 3 a.m. 71.0 ppb (68) 44.0 ppb (41) N/A 27.0 ppb (25) N/A 1.0 ppb (1) N/A 0.58 ppb (6) N/A 18.0 μg/m3 (63) 68.0
 
Jan. 16, 2020, 2 a.m. 66.0 ppb (63) 37.0 ppb (34) N/A 29.0 ppb (27) N/A 0.0 ppb (0) N/A 0.46 ppb (5) N/A 16.0 μg/m3 (59) 63.0
 
Jan. 16, 2020, 1 a.m. 68.0 ppb (65) 36.0 ppb (33) N/A 32.0 ppb (30) N/A 0.0 ppb (0) N/A 0.56 ppb (6) N/A 8.0 μg/m3 (33) 65.0
 
Jan. 16, 2020, midnight 46.0 ppb (43) 20.0 ppb (19) N/A 27.0 ppb (25) N/A 0.0 ppb (0) N/A 0.49 ppb (5) N/A 8.0 μg/m3 (33) 43.0
 
Jan. 15, 2020, 11 p.m. 22.0 ppb (20) 6.0 ppb (6) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 20.0
 
Jan. 15, 2020, 10 p.m. 28.0 ppb (26) 12.0 ppb (11) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.42 ppb (5) N/A 4.0 μg/m3 (17) 26.0
 
Jan. 15, 2020, 9 p.m. 25.0 ppb (23) 10.0 ppb (9) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.4 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 15, 2020, 8 p.m. 23.0 ppb (21) 11.0 ppb (10) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 15, 2020, 7 p.m. 15.0 ppb (14) 7.0 ppb (6) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 15, 2020, 6 p.m. 19.0 ppb (18) 9.0 ppb (8) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 15, 2020, 5 p.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 13.0
 
Jan. 15, 2020, 4 p.m. 14.0 ppb (13) 5.0 ppb (5) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 15, 2020, 3 p.m. 20.0 ppb (19) 9.0 ppb (8) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 15, 2020, 2 p.m. 22.0 ppb (20) 10.0 ppb (9) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 15, 2020, 1 p.m. 28.0 ppb (26) 12.0 ppb (11) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 15, 2020, noon 24.0 ppb (22) 10.0 ppb (9) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.36 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 15, 2020, 11 a.m. 21.0 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 15, 2020, 10 a.m. 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 15, 2020, 9 a.m. 12.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 15, 2020, 8 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 15, 2020, 7 a.m. 12.0 ppb (11) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 15, 2020, 6 a.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 15, 2020, 5 a.m. 19.0 ppb (18) 4.0 ppb (4) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 15, 2020, 4 a.m. 25.0 ppb (23) 9.0 ppb (8) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A N/A 23.0
 
Jan. 15, 2020, 3 a.m. 26.0 ppb (24) 9.0 ppb (8) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A N/A 24.0
 
Jan. 15, 2020, 2 a.m. 31.0 ppb (29) 14.0 ppb (13) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 15, 2020, 1 a.m. 38.0 ppb (35) 19.0 ppb (18) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
Jan. 15, 2020, midnight 38.0 ppb (35) 19.0 ppb (18) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.36 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 14, 2020, 11 p.m. 35.0 ppb (32) 17.0 ppb (16) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.37 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 14, 2020, 10 p.m. 39.0 ppb (36) 20.0 ppb (19) N/A 19.0 ppb (18) N/A N/A N/A 0.37 ppb (4) N/A 7.0 μg/m3 (29) 36.0
 
Jan. 14, 2020, 9 p.m. 41.0 ppb (38) 19.0 ppb (18) N/A 21.0 ppb (19) N/A N/A N/A 0.42 ppb (5) N/A 8.0 μg/m3 (33) 38.0
 
Jan. 14, 2020, 8 p.m. 34.0 ppb (31) 16.0 ppb (15) N/A 18.0 ppb (17) N/A N/A N/A 0.35 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 14, 2020, 7 p.m. 28.0 ppb (26) 13.0 ppb (12) N/A 15.0 ppb (14) N/A N/A N/A 0.31 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2020, 6 p.m. 28.0 ppb (26) 14.0 ppb (13) N/A 15.0 ppb (14) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 14, 2020, 5 p.m. 26.0 ppb (24) 14.0 ppb (13) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2020, 4 p.m. 21.0 ppb (19) 10.0 ppb (9) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 14, 2020, 3 p.m. 28.0 ppb (26) 14.0 ppb (13) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 14, 2020, 2 p.m. 34.0 ppb (31) 19.0 ppb (18) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.61 ppb (7) N/A 7.0 μg/m3 (29) 31.0
 
Jan. 14, 2020, 1 p.m. 60.0 ppb (56) 38.0 ppb (35) N/A 22.0 ppb (20) N/A 0.0 ppb (0) N/A 0.86 ppb (10) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 14, 2020, noon 45.0 ppb (42) 23.0 ppb (21) N/A 22.0 ppb (20) N/A 0.0 ppb (0) N/A 0.51 ppb (6) N/A 9.0 μg/m3 (38) 42.0
 
Jan. 14, 2020, 11 a.m. 42.0 ppb (39) 21.0 ppb (19) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 13.0 μg/m3 (52) 52.0