AQSQID: 840250170010

Site Name: Chelmsfordnr

Location: Chelmsford (E Chelmsford), MA

Reporting: True, Located: True

Current AQI: 22.0

Chelmsford (E Chelmsford) MA, US: 42.612113, -71.307519

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 19, 2020, 5 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) N/A N/A 1.0 μg/m3 (4) 22.0
 
Jan. 19, 2020, 4 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 26.0 ppb (20) N/A N/A 4.0 μg/m3 (17) 20.0
 
Jan. 19, 2020, 3 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A 21.0 ppb (16) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 2 p.m. 34.0 ppb (31) 19.0 ppb (18) N/A 15.0 ppb (14) N/A N/A 15.0 ppb (12) N/A N/A 16.0 μg/m3 (59) 59.0
 
Jan. 19, 2020, 1 p.m. 43.0 ppb (40) 23.0 ppb (21) N/A 20.0 ppb (19) N/A N/A 10.0 ppb (8) N/A N/A 16.0 μg/m3 (59) 59.0
 
Jan. 19, 2020, noon 41.0 ppb (38) 16.0 ppb (15) N/A 25.0 ppb (23) N/A N/A 5.0 ppb (4) N/A N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2020, 11 a.m. 33.0 ppb (31) 10.0 ppb (9) N/A 24.0 ppb (22) N/A N/A 7.0 ppb (5) N/A N/A 13.0 μg/m3 (52) 52.0
 
Jan. 19, 2020, 10 a.m. 31.0 ppb (29) 9.0 ppb (8) N/A 21.0 ppb (19) N/A N/A 9.0 ppb (7) N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2020, 9 a.m. 19.0 ppb (18) 1.0 ppb (1) N/A 18.0 ppb (17) N/A N/A 13.0 ppb (10) N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 19, 2020, 8 a.m. 24.0 ppb (22) 2.0 ppb (2) N/A 22.0 ppb (20) N/A N/A 10.0 ppb (8) N/A N/A 13.0 μg/m3 (52) 52.0
 
Jan. 19, 2020, 7 a.m. 31.0 ppb (29) 4.0 ppb (4) N/A 26.0 ppb (24) N/A N/A 7.0 ppb (5) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 6 a.m. 28.0 ppb (26) 3.0 ppb (3) N/A 25.0 ppb (23) N/A N/A 8.0 ppb (6) N/A N/A 10.0 μg/m3 (42) 42.0
 
Jan. 19, 2020, 5 a.m. 30.0 ppb (28) 3.0 ppb (3) N/A 27.0 ppb (25) N/A N/A 7.0 ppb (5) N/A N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2020, 4 a.m. 33.0 ppb (31) 4.0 ppb (4) N/A 30.0 ppb (28) N/A N/A 5.0 ppb (4) N/A N/A 7.0 μg/m3 (29) 31.0
 
Jan. 19, 2020, 3 a.m. 37.0 ppb (34) 7.0 ppb (6) N/A 31.0 ppb (29) N/A N/A 5.0 ppb (4) N/A N/A 10.0 μg/m3 (42) 42.0
 
Jan. 19, 2020, 2 a.m. 28.0 ppb (26) 3.0 ppb (3) N/A 25.0 ppb (23) N/A N/A 10.0 ppb (8) N/A N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2020, 1 a.m. 25.0 ppb (23) 4.0 ppb (4) N/A 21.0 ppb (19) N/A N/A 16.0 ppb (12) N/A N/A 17.0 μg/m3 (61) 61.0
 
Jan. 19, 2020, midnight 24.0 ppb (22) 5.0 ppb (5) N/A 20.0 ppb (19) N/A N/A 18.0 ppb (14) N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 18, 2020, 11 p.m. 22.0 ppb (20) 7.0 ppb (6) N/A 15.0 ppb (14) N/A N/A 24.0 ppb (18) N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 18, 2020, 10 p.m. 19.0 ppb (18) 6.0 ppb (6) N/A 13.0 ppb (12) N/A N/A 26.0 ppb (20) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2020, 9 p.m. 22.0 ppb (20) 8.0 ppb (7) N/A 14.0 ppb (13) N/A N/A 27.0 ppb (21) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2020, 8 p.m. 32.0 ppb (30) 14.0 ppb (13) N/A 18.0 ppb (17) N/A N/A 24.0 ppb (18) N/A N/A 3.0 μg/m3 (12) 30.0
 
Jan. 18, 2020, 7 p.m. 31.0 ppb (29) 15.0 ppb (14) N/A 15.0 ppb (14) N/A N/A 27.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 29.0
 
Jan. 18, 2020, 6 p.m. 17.0 ppb (16) 6.0 ppb (6) N/A 11.0 ppb (10) N/A N/A 30.0 ppb (23) N/A N/A 5.0 μg/m3 (21) 23.0
 
Jan. 18, 2020, 5 p.m. 22.0 ppb (20) 10.0 ppb (9) N/A 13.0 ppb (12) N/A N/A 31.0 ppb (24) N/A N/A 2.0 μg/m3 (8) 24.0
 
Jan. 18, 2020, 4 p.m. 25.0 ppb (23) 11.0 ppb (10) N/A 14.0 ppb (13) N/A N/A 29.0 ppb (22) N/A N/A 2.0 μg/m3 (8) 23.0
 
Jan. 18, 2020, 3 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A 36.0 ppb (28) N/A N/A 2.0 μg/m3 (8) 28.0
 
Jan. 18, 2020, 2 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A 36.0 ppb (28) N/A N/A 0.0 μg/m3 (0) 28.0
 
Jan. 18, 2020, 1 p.m. 10.0 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A 34.0 ppb (26) N/A N/A 1.0 μg/m3 (4) 26.0
 
Jan. 18, 2020, noon 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A 34.0 ppb (26) N/A N/A 2.0 μg/m3 (8) 26.0
 
Jan. 18, 2020, 11 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 34.0 ppb (26) N/A N/A 4.0 μg/m3 (17) 26.0
 
Jan. 18, 2020, 10 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 33.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
Jan. 18, 2020, 9 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 36.0 ppb (28) N/A N/A 4.0 μg/m3 (17) 28.0
 
Jan. 18, 2020, 8 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 37.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
Jan. 18, 2020, 7 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 37.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
Jan. 18, 2020, 6 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 38.0 ppb (29) N/A N/A 4.0 μg/m3 (17) 29.0
 
Jan. 18, 2020, 5 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 40.0 ppb (31) N/A N/A 1.0 μg/m3 (4) 31.0
 
Jan. 18, 2020, 4 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 40.0 ppb (31) N/A N/A 2.0 μg/m3 (8) 31.0
 
Jan. 18, 2020, 3 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 39.0 ppb (30) N/A N/A 4.0 μg/m3 (17) 30.0
 
Jan. 18, 2020, 2 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A 37.0 ppb (28) N/A N/A 4.0 μg/m3 (17) 28.0
 
Jan. 18, 2020, 1 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 40.0 ppb (31) N/A N/A 1.0 μg/m3 (4) 31.0
 
Jan. 18, 2020, midnight 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 41.0 ppb (32) N/A N/A 1.0 μg/m3 (4) 32.0
 
Jan. 17, 2020, 11 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 41.0 ppb (32) N/A N/A 1.0 μg/m3 (4) 32.0
 
Jan. 17, 2020, 10 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 41.0 ppb (32) N/A N/A 1.0 μg/m3 (4) 32.0
 
Jan. 17, 2020, 9 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 43.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
Jan. 17, 2020, 8 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 44.0 ppb (34) N/A N/A 6.0 μg/m3 (25) 34.0
 
Jan. 17, 2020, 7 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 43.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
Jan. 17, 2020, 6 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 41.0 ppb (32) N/A N/A 3.0 μg/m3 (12) 32.0
 
Jan. 17, 2020, 5 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 42.0 ppb (32) N/A N/A 3.0 μg/m3 (12) 32.0
 
Jan. 17, 2020, 4 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 41.0 ppb (32) N/A N/A 0.0 μg/m3 (0) 32.0
 
Jan. 17, 2020, 3 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 39.0 ppb (30) N/A N/A 3.0 μg/m3 (12) 30.0
 
Jan. 17, 2020, 2 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 39.0 ppb (30) N/A N/A 2.0 μg/m3 (8) 30.0
 
Jan. 17, 2020, 1 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 39.0 ppb (30) N/A N/A 2.0 μg/m3 (8) 30.0
 
Jan. 17, 2020, noon 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 39.0 ppb (30) N/A N/A 4.0 μg/m3 (17) 30.0
 
Jan. 17, 2020, 11 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 39.0 ppb (30) N/A N/A 0.0 μg/m3 (0) 30.0
 
Jan. 17, 2020, 10 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 38.0 ppb (29) N/A N/A 0.0 μg/m3 (0) 29.0
 
Jan. 17, 2020, 9 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 38.0 ppb (29) N/A N/A 1.0 μg/m3 (4) 29.0
 
Jan. 17, 2020, 8 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
Jan. 17, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 6.0 μg/m3 (25) 26.0
 
Jan. 17, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A N/A -1.0 μg/m3 (0) 24.0
 
Jan. 17, 2020, 4 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) N/A N/A -1.0 μg/m3 (0) 24.0
 
Jan. 17, 2020, 3 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 29.0 ppb (22) N/A N/A 1.0 μg/m3 (4) 22.0
 
Jan. 17, 2020, 2 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 1.0 μg/m3 (4) 21.0
 
Jan. 17, 2020, 1 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 3.0 μg/m3 (12) 20.0
 
Jan. 17, 2020, midnight 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 3.0 μg/m3 (12) 20.0
 
Jan. 16, 2020, 11 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 0.0 μg/m3 (0) 19.0
 
Jan. 16, 2020, 10 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 27.0 ppb (21) N/A N/A 0.0 μg/m3 (0) 21.0
 
Jan. 16, 2020, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 29.0 ppb (22) N/A N/A 2.0 μg/m3 (8) 22.0
 
Jan. 16, 2020, 8 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 30.0 ppb (23) N/A N/A 2.0 μg/m3 (8) 23.0
 
Jan. 16, 2020, 7 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 26.0 ppb (20) N/A N/A 0.0 μg/m3 (0) 20.0
 
Jan. 16, 2020, 6 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A N/A 1.0 μg/m3 (4) 18.0
 
Jan. 16, 2020, 5 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A N/A 0.0 μg/m3 (0) 18.0
 
Jan. 16, 2020, 4 p.m. 15.0 ppb (14) 8.0 ppb (7) N/A 8.0 ppb (7) N/A N/A 20.0 ppb (15) N/A N/A 2.0 μg/m3 (8) 15.0
 
Jan. 16, 2020, 3 p.m. 38.0 ppb (35) 19.0 ppb (18) N/A 19.0 ppb (18) N/A N/A 10.0 ppb (8) N/A N/A 7.0 μg/m3 (29) 35.0
 
Jan. 16, 2020, 2 p.m. 60.0 ppb (56) 35.0 ppb (32) N/A 25.0 ppb (23) N/A N/A 4.0 ppb (3) N/A N/A 8.0 μg/m3 (33) 56.0
 
Jan. 16, 2020, 1 p.m. 50.0 ppb (46) 25.0 ppb (23) N/A 25.0 ppb (23) N/A N/A 6.0 ppb (5) N/A N/A 6.0 μg/m3 (25) 46.0
 
Jan. 16, 2020, noon 56.0 ppb (52) 30.0 ppb (28) N/A 27.0 ppb (25) N/A N/A 4.0 ppb (3) N/A N/A 8.0 μg/m3 (33) 52.0
 
Jan. 16, 2020, 11 a.m. 48.0 ppb (44) 24.0 ppb (22) N/A 24.0 ppb (22) N/A N/A 4.0 ppb (3) N/A N/A 9.0 μg/m3 (38) 44.0
 
Jan. 16, 2020, 10 a.m. 50.0 ppb (46) 27.0 ppb (25) N/A 23.0 ppb (21) N/A N/A 5.0 ppb (4) N/A N/A 10.0 μg/m3 (42) 46.0
 
Jan. 16, 2020, 9 a.m. 57.0 ppb (53) 35.0 ppb (32) N/A 22.0 ppb (20) N/A N/A 5.0 ppb (4) N/A N/A 11.0 μg/m3 (46) 53.0
 
Jan. 16, 2020, 8 a.m. 39.0 ppb (36) 20.0 ppb (19) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (7) N/A N/A 6.0 μg/m3 (25) 36.0
 
Jan. 16, 2020, 7 a.m. 41.0 ppb (38) 21.0 ppb (19) N/A 21.0 ppb (19) N/A N/A 5.0 ppb (4) N/A N/A 7.0 μg/m3 (29) 38.0
 
Jan. 16, 2020, 6 a.m. 75.0 ppb (72) 51.0 ppb (47) N/A 24.0 ppb (22) N/A N/A 2.0 ppb (2) N/A N/A 10.0 μg/m3 (42) 72.0
 
Jan. 16, 2020, 5 a.m. 58.0 ppb (54) 35.0 ppb (32) N/A 22.0 ppb (20) N/A N/A 2.0 ppb (2) N/A N/A 11.0 μg/m3 (46) 54.0
 
Jan. 16, 2020, 4 a.m. 61.0 ppb (57) 36.0 ppb (33) N/A 24.0 ppb (22) N/A N/A 3.0 ppb (2) N/A N/A 8.0 μg/m3 (33) 57.0
 
Jan. 16, 2020, 3 a.m. 46.0 ppb (43) 22.0 ppb (20) N/A 24.0 ppb (22) N/A N/A 4.0 ppb (3) N/A N/A 6.0 μg/m3 (25) 43.0
 
Jan. 16, 2020, 2 a.m. 70.0 ppb (67) 44.0 ppb (41) N/A 26.0 ppb (24) N/A N/A 3.0 ppb (2) N/A N/A 7.0 μg/m3 (29) 67.0
 
Jan. 16, 2020, 1 a.m. 68.0 ppb (65) 42.0 ppb (39) N/A 26.0 ppb (24) N/A N/A 4.0 ppb (3) N/A N/A 7.0 μg/m3 (29) 65.0
 
Jan. 16, 2020, midnight 57.0 ppb (53) 29.0 ppb (27) N/A 28.0 ppb (26) N/A N/A 3.0 ppb (2) N/A N/A 10.0 μg/m3 (42) 53.0
 
Jan. 15, 2020, 11 p.m. 17.0 ppb (16) 3.0 ppb (3) N/A 13.0 ppb (12) N/A N/A 19.0 ppb (15) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 15, 2020, 10 p.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A N/A 25.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 19.0
 
Jan. 15, 2020, 9 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A 29.0 ppb (22) N/A N/A 4.0 μg/m3 (17) 22.0
 
Jan. 15, 2020, 8 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 31.0 ppb (24) N/A N/A 4.0 μg/m3 (17) 24.0
 
Jan. 15, 2020, 7 p.m. 16.0 ppb (15) 8.0 ppb (7) N/A 8.0 ppb (7) N/A N/A 29.0 ppb (22) N/A N/A N/A 22.0
 
Jan. 15, 2020, 6 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 30.0 ppb (23) N/A N/A N/A 23.0
 
Jan. 15, 2020, 5 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 29.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 15, 2020, 4 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 25.0 ppb (19) N/A N/A 3.0 μg/m3 (12) 19.0
 
Jan. 15, 2020, 3 p.m. 19.0 ppb (18) 10.0 ppb (9) N/A 8.0 ppb (7) N/A N/A 22.0 ppb (17) N/A N/A 4.0 μg/m3 (17) 18.0
 
Jan. 15, 2020, 2 p.m. 14.0 ppb (13) 7.0 ppb (6) N/A 8.0 ppb (7) N/A N/A 20.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 15, 2020, 1 p.m. 15.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (9) N/A N/A 14.0 ppb (11) N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 15, 2020, noon 29.0 ppb (27) 13.0 ppb (12) N/A 16.0 ppb (15) N/A N/A 6.0 ppb (5) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 15, 2020, 11 a.m. 45.0 ppb (42) 29.0 ppb (27) N/A 16.0 ppb (15) N/A N/A 5.0 ppb (4) N/A N/A 13.0 μg/m3 (52) 52.0
 
Jan. 15, 2020, 10 a.m. 45.0 ppb (42) 29.0 ppb (27) N/A 15.0 ppb (14) N/A N/A 3.0 ppb (2) N/A N/A 13.0 μg/m3 (52) 52.0
 
Jan. 15, 2020, 9 a.m. 29.0 ppb (27) 17.0 ppb (16) N/A 13.0 ppb (12) N/A N/A 5.0 ppb (4) N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 15, 2020, 8 a.m. 29.0 ppb (27) 16.0 ppb (15) N/A 12.0 ppb (11) N/A N/A 7.0 ppb (5) N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 15, 2020, 7 a.m. 24.0 ppb (22) 12.0 ppb (11) N/A 12.0 ppb (11) N/A N/A 7.0 ppb (5) N/A N/A 13.0 μg/m3 (52) 52.0
 
Jan. 15, 2020, 6 a.m. 29.0 ppb (27) 16.0 ppb (15) N/A 14.0 ppb (13) N/A N/A 6.0 ppb (5) N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 15, 2020, 5 a.m. 38.0 ppb (35) 23.0 ppb (21) N/A 15.0 ppb (14) N/A N/A 6.0 ppb (5) N/A N/A 7.0 μg/m3 (29) 35.0
 
Jan. 15, 2020, 4 a.m. 26.0 ppb (24) 11.0 ppb (10) N/A 15.0 ppb (14) N/A N/A 5.0 ppb (4) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 15, 2020, 3 a.m. 38.0 ppb (35) 22.0 ppb (20) N/A 16.0 ppb (15) N/A N/A 5.0 ppb (4) N/A N/A 8.0 μg/m3 (33) 35.0
 
Jan. 15, 2020, 2 a.m. 34.0 ppb (31) 19.0 ppb (18) N/A 15.0 ppb (14) N/A N/A 6.0 ppb (5) N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 15, 2020, 1 a.m. 37.0 ppb (34) 19.0 ppb (18) N/A 17.0 ppb (16) N/A N/A 5.0 ppb (4) N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 15, 2020, midnight 42.0 ppb (39) 23.0 ppb (21) N/A 19.0 ppb (18) N/A N/A 5.0 ppb (4) N/A N/A 8.0 μg/m3 (33) 39.0
 
Jan. 14, 2020, 11 p.m. 42.0 ppb (39) 24.0 ppb (22) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (7) N/A N/A 7.0 μg/m3 (29) 39.0
 
Jan. 14, 2020, 10 p.m. 35.0 ppb (32) 19.0 ppb (18) N/A 16.0 ppb (15) N/A N/A 13.0 ppb (10) N/A N/A 6.0 μg/m3 (25) 32.0
 
Jan. 14, 2020, 9 p.m. 41.0 ppb (38) 23.0 ppb (21) N/A 18.0 ppb (17) N/A N/A 13.0 ppb (10) N/A N/A 6.0 μg/m3 (25) 38.0
 
Jan. 14, 2020, 8 p.m. 35.0 ppb (32) 18.0 ppb (17) N/A 17.0 ppb (16) N/A N/A 13.0 ppb (10) N/A N/A 5.0 μg/m3 (21) 32.0
 
Jan. 14, 2020, 7 p.m. 43.0 ppb (40) 26.0 ppb (24) N/A 17.0 ppb (16) N/A N/A 14.0 ppb (11) N/A N/A 6.0 μg/m3 (25) 40.0
 
Jan. 14, 2020, 6 p.m. 36.0 ppb (33) 22.0 ppb (20) N/A 14.0 ppb (13) N/A N/A 14.0 ppb (11) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2020, 5 p.m. 32.0 ppb (30) 20.0 ppb (19) N/A 12.0 ppb (11) N/A N/A 14.0 ppb (11) N/A N/A 5.0 μg/m3 (21) 30.0
 
Jan. 14, 2020, 4 p.m. 36.0 ppb (33) 24.0 ppb (22) N/A 11.0 ppb (10) N/A N/A 11.0 ppb (8) N/A N/A 7.0 μg/m3 (29) 33.0
 
Jan. 14, 2020, 3 p.m. 39.0 ppb (36) 26.0 ppb (24) N/A 13.0 ppb (12) N/A N/A 7.0 ppb (5) N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 14, 2020, 2 p.m. 23.0 ppb (21) 11.0 ppb (10) N/A 11.0 ppb (10) N/A N/A 6.0 ppb (5) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2020, 1 p.m. 21.0 ppb (19) 10.0 ppb (9) N/A 12.0 ppb (11) N/A N/A 4.0 ppb (3) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2020, noon 21.0 ppb (19) 8.0 ppb (7) N/A 12.0 ppb (11) N/A N/A 3.0 ppb (2) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2020, 11 a.m. 14.0 ppb (13) 2.0 ppb (2) N/A 11.0 ppb (10) N/A N/A 3.0 ppb (2) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2020, 10 a.m. 16.0 ppb (15) 6.0 ppb (6) N/A 10.0 ppb (9) N/A N/A 6.0 ppb (5) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2020, 9 a.m. 12.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A N/A 8.0 ppb (6) N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 14, 2020, 8 a.m. 20.0 ppb (19) 10.0 ppb (9) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 14, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 14, 2020, 4 a.m. 23.0 ppb (21) 10.0 ppb (9) N/A 13.0 ppb (12) N/A N/A 7.0 ppb (5) N/A N/A 11.0 μg/m3 (46) 46.0
 
Jan. 14, 2020, 3 a.m. 20.0 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A 9.0 ppb (7) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2020, 2 a.m. 15.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (9) N/A N/A 12.0 ppb (9) N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2020, 1 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 15.0 ppb (12) N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 14, 2020, midnight 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A 15.0 ppb (12) N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 13, 2020, 11 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 9.0 ppb (8) N/A N/A 14.0 ppb (11) N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2020, 10 p.m. 11.0 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A 16.0 ppb (12) N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 13, 2020, 9 p.m. 11.0 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A 15.0 ppb (12) N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 13, 2020, 8 p.m. 12.0 ppb (11) 2.0 ppb (2) N/A 11.0 ppb (10) N/A N/A 16.0 ppb (12) N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 13, 2020, 7 p.m. 12.0 ppb (11) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A 16.0 ppb (12) N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 13, 2020, 6 p.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A 17.0 ppb (13) N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 13, 2020, 5 p.m. 17.0 ppb (16) 4.0 ppb (4) N/A 13.0 ppb (12) N/A N/A 16.0 ppb (12) N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2020, 4 p.m. 12.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A 20.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2020, 3 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 25.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 19.0
 
Jan. 13, 2020, 2 p.m. 29.0 ppb (27) 14.0 ppb (13) N/A 15.0 ppb (14) N/A N/A 18.0 ppb (14) N/A N/A 6.0 μg/m3 (25) 27.0
 
Jan. 13, 2020, 1 p.m. 33.0 ppb (31) 18.0 ppb (17) N/A 15.0 ppb (14) N/A N/A 19.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 31.0
 
Jan. 13, 2020, noon 24.0 ppb (22) 11.0 ppb (10) N/A 14.0 ppb (13) N/A N/A 19.0 ppb (15) N/A N/A 2.0 μg/m3 (8) 22.0
 
Jan. 13, 2020, 11 a.m. 21.0 ppb (19) 9.0 ppb (8) N/A 13.0 ppb (12) N/A N/A 20.0 ppb (15) N/A N/A 2.0 μg/m3 (8) 19.0
 
Jan. 13, 2020, 10 a.m. 20.0 ppb (19) 9.0 ppb (8) N/A 11.0 ppb (10) N/A N/A 23.0 ppb (18) N/A N/A 3.0 μg/m3 (12) 19.0
 
Jan. 13, 2020, 9 a.m. 13.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A N/A 20.0 ppb (15) N/A N/A 3.0 μg/m3 (12) 15.0
 
Jan. 13, 2020, 8 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 2.0 μg/m3 (8) 21.0
 
Jan. 13, 2020, 7 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 1.0 μg/m3 (4) 21.0
 
Jan. 13, 2020, 6 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 0.0 μg/m3 (0) 20.0
 
Jan. 13, 2020, 5 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 1.0 μg/m3 (4) 20.0
 
Jan. 13, 2020, 4 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 26.0 ppb (20) N/A N/A 2.0 μg/m3 (8) 20.0
 
Jan. 13, 2020, 3 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 28.0 ppb (22) N/A N/A 3.0 μg/m3 (12) 22.0
 
Jan. 13, 2020, 2 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 0.0 μg/m3 (0) 21.0
 
Jan. 13, 2020, 1 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 0.0 μg/m3 (0) 21.0
 
Jan. 13, 2020, midnight 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 1.0 μg/m3 (4) 21.0
 
Jan. 12, 2020, 11 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 2.0 μg/m3 (8) 21.0
 
Jan. 12, 2020, 10 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 1.0 μg/m3 (4) 21.0
 
Jan. 12, 2020, 9 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 29.0 ppb (22) N/A N/A 2.0 μg/m3 (8) 22.0
 
Jan. 12, 2020, 8 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 29.0 ppb (22) N/A N/A 1.0 μg/m3 (4) 22.0
 
Jan. 12, 2020, 7 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) N/A N/A 0.0 μg/m3 (0) 24.0
 
Jan. 12, 2020, 6 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 37.0 ppb (28) N/A N/A 0.0 μg/m3 (0) 28.0