AQSQID: 250270023

Site Name: Worcester

Location: Worcester (Downtown Worcester), MA

Reporting: True, Located: True

Current AQI: 5.0

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
March 29, 2020, 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 0.23 ppb (3) N/A N/A 5.0
 
March 29, 2020, 4 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 29, 2020, 3 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 29, 2020, 2 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 29, 2020, 1 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 29, 2020, midnight 10.0 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
March 28, 2020, 11 p.m. 30.0 ppb (28) 7.0 ppb (6) N/A 23.0 ppb (21) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 10 p.m. 21.0 ppb (19) 4.0 ppb (4) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 4.0 μg/m3 (17) 19.0
 
March 28, 2020, 9 p.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 28, 2020, 8 p.m. 16.0 ppb (15) 2.0 ppb (2) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 7 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 28, 2020, 6 p.m. 9.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 5 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 4 p.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 28, 2020, 3 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 7.0 μg/m3 (29) 29.0
 
March 28, 2020, 2 p.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 28, 2020, 1 p.m. 13.0 ppb (12) 4.0 ppb (4) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 28, 2020, noon 46.0 ppb (43) 21.0 ppb (19) N/A 25.0 ppb (23) N/A 0.0 ppb (0) N/A 0.63 ppb (7) N/A 6.0 μg/m3 (25) 43.0
 
March 28, 2020, 11 a.m. 64.0 ppb (61) 35.0 ppb (32) N/A 29.0 ppb (27) N/A 1.0 ppb (1) N/A 0.54 ppb (6) N/A 8.0 μg/m3 (33) 61.0
 
March 28, 2020, 10 a.m. 58.0 ppb (54) 30.0 ppb (28) N/A 29.0 ppb (27) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 11.0 μg/m3 (46) 54.0
 
March 28, 2020, 9 a.m. 47.0 ppb (44) 19.0 ppb (18) N/A 28.0 ppb (26) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 44.0
 
March 28, 2020, 8 a.m. 59.0 ppb (55) 29.0 ppb (27) N/A 30.0 ppb (28) N/A 0.0 ppb (0) N/A 0.42 ppb (5) N/A 13.0 μg/m3 (52) 55.0
 
March 28, 2020, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
March 28, 2020, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
March 28, 2020, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
March 28, 2020, 4 a.m. 30.0 ppb (28) 4.0 ppb (4) N/A 26.0 ppb (24) N/A 0.0 ppb (0) N/A 0.36 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
March 28, 2020, 3 a.m. 14.0 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 28, 2020, 2 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 28, 2020, 1 a.m. 19.0 ppb (18) 1.0 ppb (1) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, midnight 33.0 ppb (31) 4.0 ppb (4) N/A 29.0 ppb (27) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A -2.0 μg/m3 (0) 31.0
 
March 27, 2020, 11 p.m. 10.0 ppb (9) 1.0 ppb (1) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 1.0 μg/m3 (4) 9.0
 
March 27, 2020, 10 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 9 p.m. 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 27, 2020, 8 p.m. 14.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 13.0
 
March 27, 2020, 7 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 27, 2020, 6 p.m. 11.0 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 27, 2020, 5 p.m. 14.0 ppb (13) 5.0 ppb (5) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 27, 2020, 4 p.m. 13.0 ppb (12) 5.0 ppb (5) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 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 0.18 ppb (2) N/A 2.0 μg/m3 (8) 9.0
 
March 27, 2020, 2 p.m. 17.0 ppb (16) 7.0 ppb (6) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 1 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 10.0 μg/m3 (42) 42.0
 
March 27, 2020, noon 15.0 ppb (14) 7.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 27, 2020, 11 a.m. 16.0 ppb (15) 4.0 ppb (4) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 27, 2020, 10 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 27, 2020, 9 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
March 27, 2020, 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 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 27, 2020, 7 a.m. 9.0 ppb (8) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 27, 2020, 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 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 27, 2020, 5 a.m. 13.0 ppb (12) 0.0 ppb (0) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 27, 2020, 4 a.m. 12.0 ppb (11) 0.0 ppb (0) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 27, 2020, 3 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 27, 2020, 2 a.m. 12.0 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 27, 2020, 1 a.m. 20.0 ppb (19) 2.0 ppb (2) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 27, 2020, midnight 36.0 ppb (33) 5.0 ppb (5) N/A 31.0 ppb (29) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 26, 2020, 11 p.m. 36.0 ppb (33) 7.0 ppb (6) N/A 28.0 ppb (26) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
March 26, 2020, 10 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 9 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 8 p.m. 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 26, 2020, 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 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 6 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 26, 2020, 5 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 26, 2020, 4 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 3 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 26, 2020, 2 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 26, 2020, 1 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.4 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
March 26, 2020, noon 30.0 ppb (28) 14.0 ppb (13) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.5 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
March 26, 2020, 11 a.m. 39.0 ppb (36) 13.0 ppb (12) N/A 26.0 ppb (24) N/A 0.0 ppb (0) N/A 0.42 ppb (5) N/A 8.0 μg/m3 (33) 36.0
 
March 26, 2020, 10 a.m. 15.0 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
March 26, 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 0.31 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 26, 2020, 8 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 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 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 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 0.19 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 26, 2020, 5 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 26, 2020, 4 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 26, 2020, 3 a.m. 10.0 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 2 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 26, 2020, 1 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 26, 2020, midnight 7.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 25, 2020, 11 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, 10 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, 9 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2020, 8 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 25, 2020, 7 p.m. 16.0 ppb (15) 4.0 ppb (4) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
March 25, 2020, 6 p.m. 17.0 ppb (16) 4.0 ppb (4) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 25, 2020, 5 p.m. 18.0 ppb (17) 5.0 ppb (5) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 4 p.m. 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 25, 2020, 3 p.m. 22.0 ppb (20) 5.0 ppb (5) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2020, 2 p.m. 23.0 ppb (21) 6.0 ppb (6) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2020, 1 p.m. 30.0 ppb (28) 10.0 ppb (9) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.43 ppb (5) N/A 15.0 μg/m3 (56) 56.0
 
March 25, 2020, noon 27.0 ppb (25) 9.0 ppb (8) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.5 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 11 a.m. 26.0 ppb (24) 8.0 ppb (7) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.44 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 10 a.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 25, 2020, 9 a.m. 14.0 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 25, 2020, 8 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2020, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 25, 2020, 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 9.0 μg/m3 (38) 38.0
 
March 25, 2020, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 4 a.m. 20.0 ppb (19) 2.0 ppb (2) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 3 a.m. 19.0 ppb (18) 2.0 ppb (2) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 2 a.m. 18.0 ppb (17) 2.0 ppb (2) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2020, 1 a.m. 14.0 ppb (13) 0.0 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 25, 2020, midnight 13.0 ppb (12) 1.0 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2020, 11 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 1.0 μg/m3 (4) 6.0
 
March 24, 2020, 10 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A -1.0 μg/m3 (0) 6.0
 
March 24, 2020, 9 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 1.0 μg/m3 (4) 6.0
 
March 24, 2020, 8 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 24, 2020, 7 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2020, 6 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2020, 5 p.m. 15.0 ppb (14) 7.0 ppb (6) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2020, 4 p.m. 16.0 ppb (15) 7.0 ppb (6) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2020, 3 p.m. 16.0 ppb (15) 8.0 ppb (7) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2020, 2 p.m. 23.0 ppb (21) 13.0 ppb (12) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 21.0
 
March 24, 2020, 1 p.m. 20.0 ppb (19) 10.0 ppb (9) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 19.0
 
March 24, 2020, noon 27.0 ppb (25) 11.0 ppb (10) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 3.0 μg/m3 (12) 25.0
 
March 24, 2020, 11 a.m. 27.0 ppb (25) 8.0 ppb (7) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.39 ppb (4) N/A 4.0 μg/m3 (17) 25.0
 
March 24, 2020, 10 a.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.31 ppb (3) N/A 3.0 μg/m3 (12) 17.0
 
March 24, 2020, 9 a.m. 21.0 ppb (19) 6.0 ppb (6) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 0.0 μg/m3 (0) 19.0
 
March 24, 2020, 8 a.m. 8.0 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) N/A 0.3 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
March 24, 2020, 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 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2020, 6 a.m. 5.0 ppb (5) 0.0 ppb (0) 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 24, 2020, 5 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 24, 2020, 4 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 24, 2020, 3 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2020, 2 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2020, 1 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 24, 2020, midnight 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 9.0
 
March 23, 2020, 11 p.m. 12.0 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2020, 10 p.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2020, 9 p.m. 16.0 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2020, 8 p.m. 14.0 ppb (13) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2020, 7 p.m. 20.0 ppb (19) 5.0 ppb (5) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2020, 6 p.m. 22.0 ppb (20) 6.0 ppb (6) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.26 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 23, 2020, 5 p.m. 22.0 ppb (20) 7.0 ppb (6) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
March 23, 2020, 4 p.m. 25.0 ppb (23) 9.0 ppb (8) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 23, 2020, 3 p.m. 26.0 ppb (24) 9.0 ppb (8) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 23, 2020, 2 p.m. 29.0 ppb (27) 10.0 ppb (9) N/A 20.0 ppb (19) N/A 0.0 ppb (0) N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 23, 2020, 1 p.m. 32.0 ppb (30) 11.0 ppb (10) N/A 21.0 ppb (19) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A N/A 30.0
 
March 23, 2020, noon 33.0 ppb (31) 10.0 ppb (9) N/A 23.0 ppb (21) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2020, 11 a.m. 24.0 ppb (22) 6.0 ppb (6) N/A 17.0 ppb (16) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 23, 2020, 10 a.m. 31.0 ppb (29) 9.0 ppb (8) N/A 22.0 ppb (20) N/A 0.0 ppb (0) N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2020, 9 a.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (14) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2020, 8 a.m. 30.0 ppb (28) 8.0 ppb (7) N/A 22.0 ppb (20) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 28.0
 
March 23, 2020, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2020, 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 7.0 μg/m3 (29) 29.0
 
March 23, 2020, 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 6.0 μg/m3 (25) 25.0
 
March 23, 2020, 4 a.m. 17.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2020, 3 a.m. 24.0 ppb (22) 5.0 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A 0.21 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 23, 2020, 2 a.m. 19.0 ppb (18) 4.0 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A 0.21 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 23, 2020, 1 a.m. 20.0 ppb (19) 5.0 ppb (5) N/A 16.0 ppb (15) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2020, midnight 17.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (13) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 22, 2020, 11 p.m. 22.0 ppb (20) 4.0 ppb (4) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 20.0
 
March 22, 2020, 10 p.m. 11.0 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 22, 2020, 9 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2020, 8 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 22, 2020, 7 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2020, 6 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 22, 2020, 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 0.18 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 22, 2020, 4 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 22, 2020, 3 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2020, 2 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2020, 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 5.0 μg/m3 (21) 21.0
 
March 22, 2020, noon 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 22, 2020, 11 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2020, 10 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.19 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 22, 2020, 9 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 8.0 μg/m3 (33) 33.0
 
March 22, 2020, 8 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2020, 7 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 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 0.18 ppb (2) N/A 10.0 μg/m3 (42) 42.0